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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effective Tax Rate
Income/(Loss) before income taxes	$ 129	$ 103	$ 361	$ (71)
Income tax expense/(benefit) from continuing operations	$ 8	$ 4	$ 7	$ (1)
Effective tax rate	6.20%	3.90%	1.90%	1.40%
Uncertain Tax Benefits
Non-current tax liability for uncertain tax benefits	$ 39		$ 39
Unrecognized tax benefits, penalties and interest accrued	$ 5		$ 5

X

- Definition

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

+ References

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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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 recognized for uncertainty in income taxes classified as noncurrent.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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