Income Taxes - Income Tax Provision Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Goodwill and intangible assets	$ 2	$ 135	$ 18
Property, plant and equipment	(15)	84	(3)
Pension and other retiree benefits	(7)	(192)	0
Stock-based compensation	9	(28)	15
Tax credits and tax loss carryforwards	(4)	(4)	5
Deferred withholding tax	(100)	(119)	0
Other, net	62	16	(106)
Total deferred tax benefit (provision)	$ (53)	$ (108)	$ (71)

Effective Income Tax Rate Reconciliation, Deferred Withholding Tax, Amount

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The sum of the differences between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax loss and tax credit carryforwards.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from 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 tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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