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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
Dec. 31, 2015
Current:        
Federal   $ (7) $ 10 $ 8
State   4 8 3
Foreign   1 2 3
Current Income Tax Expense (Benefit)   (2) 20 14
Deferred:        
Federal   (72) 107 91
State   9 16 4
Foreign   0 1 1
Deferred Income Tax Expense (Benefit)   $ (63) $ 124 $ 96
Federal statutory rate   35.00% 35.00% 35.00%
Income tax (benefit) expense   $ (65) $ 144 $ 110
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   (184)    
Unrecognized Tax Benefits, Period Increase (Decrease)   $ (32)    
Subsequent Event        
Deferred:        
Federal statutory rate 21.00%