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Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 18, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, Increase (Decrease) in Rate, Percent		9.00%
Effective income tax rate		20.00%	11.00%	41.00%
Effect of revaluation of deferred taxes		0.10%	(20.00%)	(1.00%)
Excess tax benefits		$ (48)	$ (47)	$ (1)
Valuation allowance related to tax credit carryforwards		6	6
Employment tax credit disallowed		4	3	1
Unrecognized tax benefits		6	6	$ 1	$ 3
Equity Incentive Plan Activities
Income Taxes Disclosure [Line Items]
Excess tax benefits		10
State and Local Jurisdiction
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards		61
State tax credit carryforwards		7
Uncertain Tax Positions
Income Taxes Disclosure [Line Items]
Unrecognized tax benefits		6	$ 6
Internal Revenue Service
Income Taxes Disclosure [Line Items]
Employment tax credit disallowed		11
Income tax examination, penalties and interest expense		$ 4
Subsequent Event | Internal Revenue Service
Income Taxes Disclosure [Line Items]
Recovery of disallowed tax credits	$ 15

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