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Note 9. Employee Benefit Plans Estimated Future Funding (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Expected Future Benefit Payments, Fiscal Year Maturity    
2016   $ 9
2017   9
2018   9
2019   10
2020   10
2021 through 2025   $ 49
Scenario, Forecast [Member]    
Expected Future Benefit Payments, Fiscal Year Maturity    
Estimated minimum funding required during 2016 $ 3