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Income Taxes Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax benefit (expense) at U.S. statutory rate	$ (754)	$ 764	$ 721
Foreign operations	42	39	29
Valuation allowance	490	(46)	(113)
Non-controlling interest	(7)	(7)	41
Goodwill	0	(225)	(196)
Uncertain tax positions and assessments	23	(9)	4
Income not subject to taxation	172	(511)	(523)
Enactment of U.S. tax legislation, net of valuation allowance	498	0	0
Other	(26)	(41)	(31)
Income tax benefit (expense)	$ 438	$ (36)	$ (68)

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Effective Income Tax Rate Reconciliation, Gain on liabilities subject to compromise, Amount

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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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