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Investments and Other Assets - Narrative (Details) € in Millions, $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) floating_drydock | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€)
TUI Cruises GmbH Joint Venture |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of ownership interest | 50.00% |  |  |  |
Investments in entity | $ 887 |  |  | $ 814 |
Underlying equity in net assets |  |  |  | 749 |
Advances to affiliate |  |  |  | $ 57 | € 55
TUI Cruises GmbH Joint Venture | TUI Cruise Ships |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Restriction on reduction of current ownership interest (as a percent) | 37.55% |  |  |  |
TUI Cruises GmbH Joint Venture | Not Primary Beneficiary |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of ownership interest | 50.00% |  |  |  |
Grand Bahama |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of investment to be sold |  | 33.00% |  |  |
Grand Bahama | Not Primary Beneficiary |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of ownership interest | 33.00% |  | 49.00% |  |
Floating Docks S. DE RL |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of investment to be sold |  | 33.00% |  |  |
Floating Docks S. DE RL | Not Primary Beneficiary |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Percentage of ownership interest | 33.00% |  | 50.00% |  |
Investments in entity | $ 119 |  |  |  |
Number of floating drydocks | floating_drydock | 2 |  |  |  |
Percentage of certain installment payments payable | 33.00% |  |  |  |

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