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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Capitalized Contract Cost [Line Items]          
Passenger ticket revenues $ 5,139 $ 4,886 $ 13,676 $ 12,724  
Contract liability 2,800   2,800   $ 2,800
Customer deposit 93   93    
Contract asset 184   184   161
Commission, transportation and other          
Capitalized Contract Cost [Line Items]          
Capitalized contract costs 244   244   $ 252
Port Costs          
Capitalized Contract Cost [Line Items]          
Passenger ticket revenues $ 371 $ 313 $ 965 $ 822  
Minimum          
Capitalized Contract Cost [Line Items]          
Duration of cruises     3 days    
Maximum          
Capitalized Contract Cost [Line Items]          
Duration of cruises     14 days