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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 29, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	20.70%	25.70%	17.90%	24.50%
Schedule of Equity Method Investments [Line Items]
Pre-tax gain on sale	$ 0	$ (2)	$ 10	$ 227
Unrecognized tax benefits	145		145			$ 49
Unrecognized tax benefits, increase from subsidiary restructuring			18
Unrecognized tax benefits, increase from acquisition			78
Decrease in unrecognized tax benefits reasonably possible in next twelve months	29		29
Financial | Lending Solutions Business
Schedule of Equity Method Investments [Line Items]
Gain on sale of businesses, tax			2	77
Pre-tax gain on sale			10	$ 227
Controlling interest sold				55.00%
First Data
Schedule of Equity Method Investments [Line Items]
Deferred tax liabilities	$ 3,400		$ 3,400		$ 3,388

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