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Income Taxes (Reconciliation of Provision for Income Taxes to U.S. Federal Income Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate	35.00%	35.00%
U.S. statutory rate at 35%	$ 70	$ 88	$ 133	$ 136
Tax on foreign income	(21)	(27)	(42)	(41)
Tax contingencies	2	1	5	1
Valuation allowance	0	0	3	2
Other items, net	2	3	0	5
Income tax provision	$ 53	$ 65	$ 99	$ 103

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 foreign income tax expense (benefit).

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