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Property, Software and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	$ 2,506	$ 1,694
Less accumulated depreciation	(800)	(590)
Property, software and equipment, net	1,706	1,104
Depreciation expense	237	161	$ 101
Land
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	201	130
Building
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	614	367
Computer software
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	757	542
Computer hardware
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	308	248
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	335	186
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, software and equipment, gross	$ 291	$ 221

X

- Definition

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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