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Fair Value Measurements and Derivative Instruments - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Mar. 31, 2024
USD ($)
Derivatives, Fair Value [Line Items]          
Derivative instrument, credit risk exposure $ 78        
Maximum length of time hedged in derivative contract 3 years 3 years      
Percentage of debt bearing fixed interest 94.00%   92.30%    
Aggregate cost of ships on order, not including partner brands on order $ 7,900        
Amount deposited for cost of ships on order $ 1,000        
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate 36.50%   43.40%    
TUI Cruises | Foreign Currency Debt          
Derivatives, Fair Value [Line Items]          
Carrying Value $ 1,000 € 940 $ 921 € 889  
Interest rate swaps          
Derivatives, Fair Value [Line Items]          
Notional amount 1,200   1,200    
Foreign currency forward contracts | Not Designated          
Derivatives, Fair Value [Line Items]          
Notional amount 1,300       $ 1,100
Foreign currency forward contracts          
Derivatives, Fair Value [Line Items]          
Notional amount $ 3,200   $ 2,700