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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,660	$ 1,227
Less: accumulated depreciation	(1,054)	(829)
Total	1,606	398
Depreciation expense	247	92	$ 92
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61	10
Data processing equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,483	775
Data processing equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Data processing equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 540	256
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 576	$ 186
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	8 years

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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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