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Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (71)	$ 18	$ (57)	$ 13
Income (loss) from continuing operations before income tax benefit (expense)	$ (381)	$ 818	$ 454	$ 2,276
Effective income tax rate	18.60%	2.20%	(12.60%)	0.60%
Statutory federal income tax rate	21.00%	35.00%	21.00%	35.00%

X

- Definition

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

+ References

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

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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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