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Fair Value Measurements and Derivative Instruments - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2026
EUR (€)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Derivatives, Fair Value [Line Items]            
Derivative instrument, credit risk exposure $ 294          
Maximum length of time hedged in derivative contract 3 years 3 years        
Percentage of debt bearing fixed interest 97.00%       93.00%  
Aggregate cost of ships on order, not including TUI cruises on order $ 16,200          
Amount deposited for cost of ships on order $ 1,300          
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate 52.90%       64.10%  
TUI Cruises | Foreign currency debt            
Derivatives, Fair Value [Line Items]            
Net investments $ 726 € 630 $ 740 € 631    
Interest rate swaps            
Derivatives, Fair Value [Line Items]            
Notional amount 900       $ 900  
Foreign currency forward contracts | Not Designated            
Derivatives, Fair Value [Line Items]            
Notional amount 1,200         $ 1,300
Foreign currency forward contracts            
Derivatives, Fair Value [Line Items]            
Notional amount 4,700       2,000  
Fuel swaps            
Derivatives, Fair Value [Line Items]            
Estimated unrealized gain (loss) associated with cash flow hedges $ 140       $ (66)