Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 29, 2019
Income Tax Contingency [Line Items]
Valuation allowance	$ 1,145	$ 101
Unrecognized tax benefits that would impact effective tax rate	113
Expected significant change in unrecognized tax benefits	32
Interest expense and penalties	2	1	$ 1
Accrued interest expense and penalties	19	$ 4
First Data
Income Tax Contingency [Line Items]
Deferred tax liabilities				$ 3,535
Research and development costs related to First Data	$ 63