Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 43,924	$ 40,075
Less—accumulated depreciation and amortization	(13,810)	(12,529)
Property and equipment, net	30,114	27,546
Ships
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	36,255	34,344
Ship improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,259	2,367
Ships under construction
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,052	1,061
Land, buildings and improvements, including leasehold improvements and port facilities
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	763	772
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,595	$ 1,531