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Income Taxes Reconciliation of Income Tax Satutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Change in Tax Status of Subsidiary	$ (124)	$ 0		$ 0
Income tax expense (benefit) at United States statutory rate of 35 percent	248	71		316
Increase (reduction) in income taxes resulting from:
Goodwill impairment	207	278		0
Partnership earnings not subject to tax	(477)	(576)		(355)
State tax, net of federal tax benefit	124	(10)		(29)
Dividend received deduction	(14)	(15)		(22)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(1,812)	0		0
Audit settlement	0	0		(7)
Other	15	(6)		(26)
Total income tax expense (benefit) from continuing operations	$ (1,833)	$ (258)	[1]	$ (123)	[1]
[1] * As adjusted. See Note 2.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense computed b applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the effect of a change in the tax status of a subsidiary.

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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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