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Income Taxes Reconciliation of Income Tax Satutory Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Change in Tax Status of Subsidiary $ 0 $ (124) $ 0
Income tax expense at United States statutory rate 763 248 71
Increase (reduction) in income taxes resulting from:      
Goodwill impairment 0 207 278
Partnership earnings not subject to tax (635) (477) (576)
State tax, net of federal tax benefit (125) 124 (10)
Dividend received deduction (5) (14) (15)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 0 (1,812) 0
Other 6 15 (6)
Total income tax expense (benefit) from continuing operations $ 4 $ (1,833) $ (258)