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Income Taxes Components of Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current expense (benefit):      
Federal $ 54 $ (47) $ (308)
State (16) (34) (54)
Total 38 (81) (362)
Deferred expense (benefit):      
Federal (2,055) (189) 268
State 184 12 (29)
Total (1,871) (177) 239
Total income tax expense (benefit) from continuing operations $ (1,833) $ (258) [1] $ (123) [1]
[1] * As adjusted. See Note 2.