Debt - Narrative (Details) $ in Millions, € in Billions, £ in Billions	1 Months Ended	3 Months Ended
	Jan. 31, 2025	Feb. 28, 2025 USD ($) cruise_ship identity	Feb. 29, 2024 USD ($)	Feb. 28, 2025 EUR (€) cruise_ship	Feb. 28, 2025 GBP (£) cruise_ship
Schedule of Debt Outstanding [Line Items]
Debt extinguishment and modification costs		$ (252)	$ (33)
Debt extinguishment costs		197	$ 31
Ships and ship improvements		39,000
Vessels and material intellectual property		22,100
Vessels and related assets		20,500
Debt instrument, convertible, equity component minimum threshold		5,000
Debt instrument, convertible, liquidity component minimum threshold		$ 1,500
Debt instrument, debt covenant, period four
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		$ 2,900
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 | November 30, 2025 testing date
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio		2.5
New Revolving Facility | February 28, 2026 testing date onwards
Schedule of Debt Outstanding [Line Items]
Debt instrument, debt covenant, required interest coverage covenant, ratio		3.0
Carnival Holdings (Bermuda) II Limited | Revolving facility
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,900
Carnival Holdings (Bermuda) II Limited | Multi-Currency Revolving Facility
Schedule of Debt Outstanding [Line Items]
Line of credit facility, maximum borrowing capacity		1,900		€ 0.9	£ 0.1
Export Credit Facility | Line of Credit | Sun Princess Limited
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount		800
Export Credit Facility | Line of Credit | Sun Princess II Limited
Schedule of Debt Outstanding [Line Items]
Debt instrument, face amount		200
2027 Secured Term Loan Facility | Line of Credit | Minimum
Schedule of Debt Outstanding [Line Items]
Interest rate floor (percent)	0.008
2027 Secured Term Loan Facility | Line of Credit | Maximum
Schedule of Debt Outstanding [Line Items]
Interest rate floor (percent)	2.0
Senior Unsecured Notes Due 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)		5.80%		5.80%	5.80%
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%
Senior Unsecured Notes Due 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)		6.10%		6.10%	6.10%
Notes Payable Due May 2028 | Secured | Guarantor Subsidiaries
Schedule of Debt Outstanding [Line Items]
Debt instrument, interest rate (as a percent)		10.40%		10.40%	10.40%
Export Credit Facility Due 2035 | Line of Credit
Schedule of Debt Outstanding [Line Items]
Undrawn export credit facilities		$ 7,800
Value of vessels subject to negative pledges		18,500
Revolving Facility Notes Due 2028 | Carnival Bermuda (Holdings) Limited
Schedule of Debt Outstanding [Line Items]
Ships and ship improvements		$ 2,800
Number of unencumbered vessels | cruise_ship		3		3	3
Senior Priority Notes Due 2028 | Carnival Bermuda (Holdings) Limited
Schedule of Debt Outstanding [Line Items]
Changes in identity of vessels | identity		0