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Investments and Other Assets - Narrative (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2016
Mar. 31, 2025
USD ($)
floating_drydock
Mar. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
TUI Cruises GmbH Joint Venture            
Investments in and Advances to Affiliates [Line Items]            
Percentage of ownership interest   50.00% 50.00%      
Investments in entity   $ 892   $ 814    
Underlying equity in net assets   832   749    
Advances to affiliate   $ 55 € 51 $ 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% 37.55%      
TUI Cruises GmbH Joint Venture | Splendour of the Seas            
Investments in and Advances to Affiliates [Line Items]            
Interest rate on loan provided to related party (as a percent) 6.25%          
Debt, guaranteed percentage 50.00%          
TUI Cruises GmbH Joint Venture | Not Primary Beneficiary            
Investments in and Advances to Affiliates [Line Items]            
Percentage of ownership interest   50.00% 50.00%      
Grand Bahama            
Investments in and Advances to Affiliates [Line Items]            
Percentage of investment to be sold       33.00% 33.00%  
Grand Bahama | Not Primary Beneficiary            
Investments in and Advances to Affiliates [Line Items]            
Percentage of ownership interest   49.00% 49.00%      
Floating Docks S. DE RL            
Investments in and Advances to Affiliates [Line Items]            
Percentage of investment to be sold       33.00% 33.00%  
Floating Docks S. DE RL | Not Primary Beneficiary            
Investments in and Advances to Affiliates [Line Items]            
Percentage of ownership interest   50.00% 50.00%      
Investments in entity   $ 105        
Number of floating drydocks | floating_drydock   2        
Percentage of certain installment payments payable           50.00%
Investment total guaranteed   $ 20        
Other Shareholder | Grand Bahama | Not Primary Beneficiary            
Investments in and Advances to Affiliates [Line Items]            
Percentage of ownership interest   49.00% 49.00%