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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. statutory rate at 35%	$ 290	$ 269	$ 224
Tax on foreign income	(81)	(88)	(74)
Valuation allowance	9	(14)	21
Tax contingencies	6	11	13
Tax law changes	174	3	4
Other items, net	3	5	(10)
Total	$ 401	$ 186	$ 178

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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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 increase (decrease) in the income tax rates.

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