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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax provision before income from investment in unconsolidated affiliate	20.90%	23.00%	16.60%	24.20%
Schedule of Equity Method Investments [Line Items]
Pre-tax gain on sale	$ 0	$ (3)	$ 10	$ 229
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	$ 229
Controlling interest sold		55.00%

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