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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 |  |  |  |  |

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