XML 99 R55.htm IDEA: XBRL DOCUMENT v3.7.0.1
Income Taxes, Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income tax expense (benefit)      
Current federal income tax expense (benefit) $ 17 $ 93 $ (88)
Current state income tax expense 1 8 11
Deferred federal income tax expense (benefit) 20 61 43
Federal - valuation allowance adjustment     (11)
Deferred state income tax expense (benefit) 2 10 2
State - valuation allowance adjustment     38
Total income tax expense (benefit) $ 40 $ 172 $ (5)