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Note 10. Income Taxes Income Tax Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ (13) $ (7) $ 10
State 5 4 8
Foreign 2 1 2
Current Income Tax Expense (Benefit) (6) (2) 20
Deferred:      
Federal 62 (72) 107
State 9 9 16
Foreign 0 0 1
Deferred Income Tax Expense (Benefit) 71 (63) 124
Income tax expense (benefit) [1] $ 65 $ (65) $ 144
Federal statutory rate 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ (184)  
Unrecognized Tax Benefits, Period Increase (Decrease)   $ (32)  
[1] Income tax benefit for the year ended December 31, 2017 reflects the impact of the 2017 Tax Act.