Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 33,882	$ 34,600
Accumulated depreciation and amortization	(20,699)	(21,483)
Property and equipment, net	13,183	12,873
Property and equipment, net		13,117
Disposal Group, Held-for-sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Property and equipment, net		244
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	1,958	1,996
Building and improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	4,571	4,545
Fixtures and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,024	12,978
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	6,511	6,238
Software
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 9,818	$ 8,843