SCHEDULE 13G

Amendment No. 3
Carnival Corporation / Carnival Plc
Common Stock
Cusip # G7214F130

Cusip # G7214F130
Item 1:	Reporting Person - FMR Corp.
Item 4:	Delaware
Item 5:	9,393,039
Item 6:	0
Item 7:	23,264,303
Item 8:	0
Item 9:	23,264,303
Item 11:	2.734%
Item 12:	    HC

Cusip # G7214F130
Item 1:	Reporting Person - Edward C. Johnson 3d
Item 4:	United States of America
Item 5:	0
Item 6:	0
Item 7:	23,264,303
Item 8:	0
Item 9:	23,264,303
Item 11:	2.734%
Item 12:	IN

Cusip # G7214F130
Item 1:	Reporting Person - Abigail P. Johnson
Item 4:	United States of America
Item 5:	0
Item 6:	0
Item 7:	23,264,303
Item 8:	0
Item 9:	23,264,303
Item 11:	2.734%
Item 12:	    IN


SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)

The attached holdings are as of December 31, 2004 and this report relies
on information provided by the investor relations department of Carnival
Corporation.


Item 1(a).	Name of Issuer:

		Carnival Corporation / Carnival Plc

Item 1(b).	Name of Issuer's Principal Executive Offices:

		3655 N.W. 87th Avenue
		Miami, FL  33178-2428


Item 2(a).	Name of Person Filing:

		FMR Corp.

Item 2(b).	Address or Principal Business Office or, if None, Residence:

		82 Devonshire Street, Boston, Massachusetts  02109

Item 2(c).	Citizenship:

		Not applicable

Item 2(d).	Title of Class of Securities:

		Common Stock

Item 2(e).	CUSIP Number:

		G7214F130

Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and
the person filing, FMR Corp., is a parent holding company in accordance with
Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7).

Item 4.	Ownership

(a)	Amount Beneficially Owned:	23,264,303

(b)	Percent of Class:	2.734%

(c)	Number of shares as to which such person has:

(i)	sole power to vote or to direct the vote:	9,393,039

(ii)	shared power to vote or to direct the vote:	0

(iii)	sole power to dispose or to direct the disposition of:	23,264,303

(iv)	shared power to dispose or to direct the disposition of:	0



Item 5.	Ownership of Five Percent or Less of a Class.

	If the statement is being filed to report the fact that as of the date
	hereof, the reporting person has ceased to be the beneficial owner of
	more than five percent of the class of securities, check the following
	(X).

Item 6.	Ownership of More than Five Percent on Behalf of Another Person.

	Not applicable

Item 7.	Identification and Classification of the Subsidiary Which Acquired the
	Security Being Reported on By the Parent Holding Company.

	See attached Exhibit(s) A, B, and C.

Item 8.	Identification and Classification of Members of the Group.

	Not Applicable. See attached Exhibit A.

Item 9.	Notice of Dissolution of Group.

	Not applicable.

Item 10.	Certification.

	By signing below I certify that, to the best of my knowledge and
	belief, the securities referred to above were acquired in the ordinary
	course of business and were not acquired for the purpose of and do not
	have the effect of changing or influencing the control of the issuer of
	such securities and were not acquired in connection with or as a
	participant in any transaction having such purpose or effect.

Signature

	After reasonable inquiry and to the best of my knowledge and belief,
	I certify that the information set forth in this Schedule 13G in
	connection with FMR Corp.'s beneficial ownership of the Common Stock
	of Carnival Corporation at December 31, 2004 is true, complete and
	correct.

July 20, 2005
Date

 /s/Eric D. Roiter
Signature

Eric D. Roiter
Duly authorized under Power of Attorney
dated December 30, 1997 by and on behalf
of FMR Corp. and its direct and indirect
subsidiaries

SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)



Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity Management
& Research Company ("Fidelity"), 82 Devonshire Street, Boston, Massachusetts
02109, a wholly-owned subsidiary of FMR Corp. and an investment adviser
registered under Section 203 of the Investment Advisers Act of 1940, is the
beneficial owner of 13,531,093 shares or 6.379% of the Common Stock
outstanding of Carnival Corporation  ("the Company") as a result of acting as
investment adviser to various investment companies registered under Section 8
of the Investment Company Act of 1940. The number of shares of Common Stock
of Carnival Corporation owned by the investment companies at
December 31, 2004 included 11,180,739 shares of Common Stock resulting from
the assumed conversion of 11,180,739 shares of CARNIVAL CORP PAIRED CTF. The
number of shares of Common Stock of Carnival Corporation owned by the
investment companies at December 31, 2004 included 41,412 shares of Common
Stock resulting from the assumed conversion of $3,400,000 principal amount of
CARNIVAL CORP CV 1.132/0% 4/33 (12.18 shares of Common Stock for each $1,000
principal amount of debenture).

Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the
funds each has sole power to dispose of the 13,531,093 shares owned by the
Funds.

Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has the
sole power to vote or direct the voting of the shares owned directly by the
Fidelity Funds, which power resides with the Funds' Boards of Trustees.
Fidelity carries out the voting of the shares under written guidelines
established by the Funds' Boards of Trustees.

Fidelity Management Trust Company, 82 Devonshire Street, Boston,
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and a bank as
defined in Section 3(a)(6) of the Securities Exchange Act of 1934, is the
beneficial owner of  3,786,096 shares or 1.785% of the Common Stock
outstanding of the Company as a result of its serving as investment manager
of the institutional account(s). The number of shares of Common Stock of
Carnival Corporation owned by the institutional account(s) at
December 31, 2004 included 1,344,649 shares of Common Stock resulting from
the assumed conversion of 1,344,649 shares of CARNIVAL CORP PAIRED CTF.

Edward C. Johnson 3d and FMR Corp., through its control of Fidelity
Management Trust Company, each has sole dispositive power over 3,786,096
shares and sole power to vote or to direct the voting of 3,412,858 shares,
and no power to vote or to direct the voting of 373,238 shares of Common
Stock owned by the institutional account(s) as reported above.

Strategic Advisers, Inc., 82 Devonshire Street, Boston, MA 02109, a
wholly-owned subsidiary of FMR Corp. and an investment adviser registered
under Section 203 of the Investment Advisers Act of 1940, provides
investment advisory services to individuals.  As such, FMR Corp.'s
beneficial ownership includes 2,225 shares, or 0.001%, of the Common Stock
stock outstanding of Carnival Corporation, beneficially owned through
Strategic Advisers, Inc.

Members of the Edward C. Johnson 3d family are the predominant owners of
Class B shares of common stock of FMR Corp., representing approximately
49% of the voting power of FMR Corp.  Mr. Johnson 3d owns 12.0% and Abigail
Johnson owns 24.5% of the aggregate outstanding voting stock of FMR Corp.
Mr. Johnson 3d is Chairman of FMR Corp. and Abigail P. Johnson is a Director
of FMR Corp.  The Johnson family group and all other Class B shareholders
have entered into a shareholders' voting agreement under which all Class B
shares will be voted in accordance with the majority vote of Class B shares.
Accordingly, through their ownership of voting common stock and the execution
of the shareholders' voting agreement, members of the Johnson family may be
deemed, under the Investment Company Act of 1940, to form a controlling group
with respect to FMR Corp.

Fidelity International Limited, Pembroke Hall, 42 Crowlane, Hamilton,
Bermuda, and various foreign-based subsidiaries provide investment advisory
and management services to a number of non-U.S. investment companies
(the "International Funds") and certain institutional investors.  Fidelity
International Limited is the beneficial owner of 5,944,889 shares or 2.802%
of the Common Stock outstanding of the Company. The number of shares of
Common Stock of Carnival Corporation owned by the institutional account(s)
at December 31, 2004 included 2,229,937 shares of Common Stock resulting
from the assumed conversion of 2,229,937 shares of CARNIVAL CORP PAIRED CTF.
Additional information with respect to the beneficial ownership of Fidelity
International Limited is shown on Exhibit B.

Some or all of the shares of Common Stock of Carnival Corporation owned by
the investment companies at December 31, 2004 may include shares represented
by American Depository Shares.



SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)

Pursuant to instructions in Item 7 of Schedule 13G, this Exhibit has been
prepared to identify Fidelity International Limited, Pembroke Hall,
42 Crow Lane, Hamilton, Bermuda, a Bermudan joint stock company incorporated
for an unlimited duration by private act of the Bermuda Legislature (FIL)
and an investment adviser to various investment companies
(the "International Funds") and certain institutional investors, as a
beneficial owner of the 5,944,889 shares or 2.802% of the Common Stock
outstanding of Carnival Corporation.

Prior to June 30, 1980, FIL was a majority-owned subsidiary of Fidelity
Management & Research Company (Fidelity), a wholly-owned subsidiary of
FMR Corp.  On that date, the shares of FIL held by Fidelity were distributed,
as a dividend,  to the shareholders of FMR Corp.  FIL currently operates as
an entity independent of FMR Corp. and Fidelity.  The International Funds
and FIL's other clients, with the exception of Fidelity and an
affiliated company of Fidelity, are non-U.S. entities.

A partnership controlled by Edward C. Johnson 3d and members of his family
owns shares of FIL voting stock with the right to cast approximately 39.89%
of the total votes which may be cast by all holders of FIL voting stock.
Mr. Johnson 3d is Chairman of FMR Corp. and FIL.  FMR Corp. and FIL are
separate and independent corporate entities, and their Boards of Directors
are generally composed of different individuals.  Other than when one serves
as a sub adviser to the other, their investment decisions are made
independently, and their clients are generally different organizations.

FMR Corp. and FIL are of the view that they are not acting as a "group"
for purposes of Section 13(d) under the Securities Exchange Act of 1934
(the "1934" Act) and that they are not otherwise required to attribute to
each other the "beneficial ownership" of securities "beneficially owned" by
the other corporation within the meaning of Rule 13d-3 promulgated under the
1934 Act.  Therefore, they are of the view that the shares held by the other
corporation need not be aggregated for purposes of Section 13(d). However,
FMR Corp. is making this filing on a voluntary basis as if all of the shares
are beneficially owned by FMR Corp. and FIL on a joint basis.

FIL may continue to have the International Funds or other accounts purchase
shares subject to a number of factors, including, among others, the
availability of shares for sale at what FIL considers to be reasonable prices
and other investment opportunities that may be available to the International
Funds.

FIL intends to review continuously the equity position of the International
Funds and other accounts in the Company.  Depending upon its future
evaluations of the business and prospects of the Company and upon other
developments, including, but not limited to, general economic and business
conditions and money market and stock market conditions, FIL may determine to
cease making additional purchases of shares or to increase or decrease the
equity interest in the Company by acquiring additional shares, or by
disposing of all or a portion of the shares.

FIL does not have a present plan or proposal which relates to or would
result in (i) an extraordinary corporate transaction, such as a merger,
reorganization, liquidation, or sale or transfer of a material amount of
assets involving the Company or any of its subsidiaries, (ii) any change
in the Company's present Board of Directors or management, (iii) any
material changes in the Company's present capitalization or dividend policy
or any other material change in the Company's business or corporate
structure, (iv) any change in the Company's charter or by-laws, or (v) the
Company's common stock becoming eligible for termination of its registration
pursuant to Section 12(g)(4) of the 1934 Act.

FIL  has sole power to vote and the sole power to dispose of
5,944,889  shares.

SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)
RULE 13d-1(f)(1)  AGREEMENT

The undersigned persons, on July 20, 2005, agree and consent to the joint
filing on their behalf of this Schedule 13G in connection with their
beneficial ownership of the Common Stock of Carnival Corporation / Carnival
Plc at December 31, 2004.

FMR Corp.

By /s/ Eric D. Roiter
Eric D. Roiter
Duly authorized under Power of Attorney
dated December 30, 1997, by and on behalf
of FMR Corp. and its direct and indirect
subsidiaries

Edward C. Johnson 3d

By /s/ Eric D. Roiter
Eric D. Roiter
Duly authorized under Power of Attorney
dated December 30, 1997, by and on behalf
of Edward C. Johnson 3d

Abigail P. Johnson

By /s/ Eric D. Roiter
Eric D. Roiter
Duly authorized under Power of Attorney
dated December 30, 1997, by and on behalf
of Abigail P. Johnson

Fidelity Management & Research Company

By /s/ Eric D. Roiter
Eric D. Roiter
Senior V.P. and General Counsel





Page 1 of 10

Exhibit A

Exhibit B

Exhibit C