Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	12.10%	1.90%	19.80%	22.00%
Charge from valuation allowance for tax carryovers			$ 2	$ 4
Tax benefit from resolution of settlement	$ 3	$ 10	6	$ 14
Re-measurement of deferred tax assets			$ 9
Percent decrease in unrecognized benefits, reasonably possible (up to)	20.00%		20.00%

Percent Decrease In Unrecognized Benefits is Reasonably Possible

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- Definition

Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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