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Note 10. Income Taxes Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 10 $ 8 $ 5
State 8 3 1
Foreign 2 3 4
Current Income Tax Expense (Benefit) 20 14 10
Deferred:      
Federal 107 91 76
State 16 4 1
Foreign 1 1 0
Deferred Income Tax Expense (Benefit) 124 96 77
Income tax expense $ 144 $ 110 $ 87