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Income Taxes (Provision and Reform) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Income Taxes
Annual effective tax rate excluding discrete items (as a percent)		(15.60%)	64.20%
Various discrete tax items		$ (91)	$ 57
Annual effective tax rate (as a percent)		(7.20%)	(3.60%)
Valuation allowance change during period	$ 91
Estimated transition taxes		$ 104
Deferred tax assets change due to 2017 Tax Act		$ (17)

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

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Amount of reasonable estimate for income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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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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