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Other Assets (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Dec. 31, 2019 USD ($) cruise_ship | Aug. 31, 2021 USD ($) | Aug. 31, 2020 USD ($) | Nov. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Impairment charge |  |  | $ 541 | $ 3,925 |
White Pass And Yukon Route |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Impairment charge |  |  | 17 |  |
Investment, amount |  |  | 76 |  | $ 94
Investment loan |  |  | 25 |  | 19
Investment equity |  |  | 51 |  | 75
CSSC-Carnival |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment, amount |  |  | $ 207 |  | $ 140
EA Segment | CSSC-Carnival |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of cruise ships | cruise_ship |  | 2 |  |  |
Investment amount sold | $ 283 | $ 107 |  |  |

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