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Debt - Narrative (Details) $ in Millions, € in Billions, £ in Billions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2025 USD ($) | Aug. 31, 2024 USD ($) | Aug. 31, 2025 USD ($) | Aug. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 EUR (€) | Jun. 30, 2025 GBP (£)
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  | $ 242 | $ 41 |  |  |  |
Debt extinguishment and modification costs | $ (111) | $ (13) | (366) | $ (78) |  |  |  |
Debt extinguishment cost, premium paid | 45 |  | 241 |  |  |  |  |
Ships and ship improvements | 39,700 |  | 39,700 |  |  |  |  |
Vessels and material intellectual property | 22,700 |  | 22,700 |  |  |  |  |
Vessels and related assets | 21,000 |  | 21,000 |  |  |  |  |
Debt instrument, convertible, liquidity component minimum threshold |  |  | 1,500 |  |  |  |  |
Eurodollar |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, convertible, equity component minimum threshold |  |  | $ 5,000 |  |  |  |  |
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% |  |  |  |  |
Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt extinguishment costs |  |  | $ 9,600 |  |  |  |  |
New Revolving Facility |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 1,000 |  |
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 | February 28, 2026 testing date |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt covenant, required interest coverage covenant, ratio |  |  | 3.0 |  |  |  |  |
Revolving facility |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Available for borrowing | 4,500 |  | $ 4,500 |  |  |  |  |
Carnival Holdings (Bermuda) II Limited | New Revolving Facility |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 4,500 |  |
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 | 1,100 |  | 1,100 |  |  |  |  |
Export Credit Facility | Line of Credit | Sun Princess II Limited |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | 1,100 |  | 1,100 |  |  |  |  |
Notes Payable Due March 2030 | Unsecured Debt |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 1,000 |  | $ 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% |  |  |  |  |
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% |  |  |  |  |
Euro-denominated Notes Payable Due July 2031 | Unsecured Debt |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 1,200 |  | $ 1,200 |  |  |  |  |
Euro-denominated Notes Payable Due July 2031 | Unsecured Debt | Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 4.13% |  | 4.13% |  |  |  |  |
Notes Payable Due August 2032 | Unsecured Debt |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 3,000 |  | $ 3,000 |  |  |  |  |
Notes Payable Due August 2032 | Unsecured Debt | Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.75% |  | 5.75% |  |  |  |  |
Notes Payable Due February 2033 | Unsecured Debt |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 2,000 |  | $ 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% |  |  |  |  |
Notes Payable Due August 2027 | Unsecured Debt |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 400 |  | $ 400 |  |  |  |  |
Floating Rate Bank Loan Due August 2027 | Unsecured Debt | Guarantor Subsidiaries | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, variable rate (as a percent) |  |  | 1.13% |  |  |  |  |
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% |  |  |  |  |
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% |  |  |  |  |
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% |  |  |  |  |
Notes Payable Due March 2027 | Unsecured Debt | Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.75% |  | 5.75% |  |  |  |  |
Export Credit Facility Due 2035 | Line of Credit |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Undrawn export credit facilities | $ 8,700 |  | $ 8,700 |  |  |  |  |
Value of vessels subject to negative pledges | $ 18,200 |  | $ 18,200 |  |  |  |  |
Export Credit Facility Due 2037 | Line of Credit | Sun Princess II Limited | Forecast |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 800 |  |  |
Convertible Notes Payable Due December 2027 | Unsecured Debt | Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule of Debt Outstanding [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 5.75% |  | 5.75% |  |  |  |  |

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