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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 47,140 $ 43,924
Less—accumulated depreciation and amortization (15,309) (13,810)
Property and equipment, net 31,831 30,114
Ships    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 41,046 36,255
Ship improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,491 2,259
Ships under construction    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,048 3,052
Land, buildings and improvements, including leasehold improvements and port facilities    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 887 763
Computer hardware and software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 1,668 $ 1,595