Property and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 24,409	$ 24,008
Less — accumulated depreciation and amortization	(9,255)	(8,492)
Property and equipment, net	15,154	15,516
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	651	672
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,861	17,703
Furniture, Fixtures, Equipment And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,255	3,999
Transportation [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	458	455
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,184	$ 1,179

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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