Debt - Narrative (Details) $ in Millions, € in Billions, £ in Billions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2025	May 31, 2025 USD ($) cruise_ship	May 31, 2024 USD ($)	May 31, 2025 USD ($) cruise_ship identity	May 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	May 31, 2025 EUR (€) cruise_ship	May 31, 2025 GBP (£) cruise_ship	Feb. 28, 2025 USD ($)
Schedule of Debt Outstanding [Line Items]
Debt extinguishment and modification costs		$ (4)	$ (33)	$ (255)	$ (66)
Debt extinguishment costs				197	$ 41
Ships and ship improvements		39,800		39,800
Vessels and material intellectual property		22,700		22,700
Vessels and related assets		21,100		21,100
Debt instrument, convertible, equity component minimum threshold				5,000
Debt instrument, convertible, liquidity component minimum threshold				$ 1,500
Debt Instrument, Debt Covenant, Period
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required debt to capital covenant (as a percent)				65.00%
Revolving facility
Schedule of Debt Outstanding [Line Items]
Available for borrowing		3,000		$ 3,000
New Revolving Facility | Subsequent Event
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity						$ 1,000
New Revolving Facility | May 31, 2025 testing date
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio				2.0
New Revolving Facility | August 31, 2025 testing date
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio				2.5
New Revolving Facility | November 30, 2025 testing date
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio				3.0
New Revolving Facility | May 31, 2025 testing date onwards
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio				2.0
Carnival Holdings (Bermuda) II Limited | Revolving facility
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		3,000		$ 3,000
Carnival Holdings (Bermuda) II Limited | Multi-Currency Revolving Facility
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		1,900		1,900			€ 0.9	£ 0.1
Carnival Holdings (Bermuda) II Limited | New Revolving Facility | Subsequent Event
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity						$ 4,500
Export Credit Facility | Line of Credit | Sun Princess Limited
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount		900		900
Export Credit Facility | Line of Credit | Sun Princess II Limited
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 200		$ 200
2027 Secured Term Loan Facility | Line of Credit | Minimum
Schedule of Debt Outstanding [Line Items]
Interest rate floor (percent)	0.0075
2027 Secured Term Loan Facility | Line of Credit | Maximum
Schedule of Debt Outstanding [Line Items]
Interest rate floor (percent)	0.0200
Notes Payable Due March 2030 | Unsecured Debt
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount									$ 1,000
Notes Payable Due March 2030 | Unsecured Debt | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		5.75%		5.75%			5.75%	5.75%
Notes Payable Due June 2030 | Unsecured Debt | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		10.50%		10.50%			10.50%	10.50%
Notes Payable Due February 2033 | Unsecured Debt
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount									$ 2,000
Notes Payable Due February 2033 | Unsecured Debt | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		6.13%		6.13%			6.13%	6.13%
Notes Payable Due May 2028 | Secured | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		10.38%		10.38%			10.38%	10.38%
Notes Payable Due June 2031 | Unsecured Debt
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount		$ 1,000		$ 1,000
Notes Payable Due June 2031 | Unsecured Debt | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		5.88%		5.88%			5.88%	5.88%
Notes Payable Due March 2026 | Unsecured Debt | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		7.63%		7.63%			7.63%	7.63%
Export Credit Facility Due 2035 | Line of Credit
Schedule of Debt Outstanding [Line Items]
Undrawn export credit facilities		$ 8,400		$ 8,400
Value of vessels subject to negative pledges		18,700		18,700
Revolving Facility Notes Due | Carnival Holdings (Bermuda) II Limited
Schedule of Debt Outstanding [Line Items]
Ships and ship improvements		$ 2,800		$ 2,800
Number of unencumbered vessels | cruise_ship		3		3			3	3
Senior Priority Notes Due 2028 | Carnival Holdings (Bermuda) II Limited
Schedule of Debt Outstanding [Line Items]
Changes in identity of vessels | identity				0