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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, 2017
Dec. 31, 2016
Expected Future Benefit Payments, Fiscal Year Maturity    
2017   $ 9
2018   9
2019   10
2020   10
2021   10
2022 through 2026   $ 49
Scenario, Forecast [Member]    
Expected Future Benefit Payments, Fiscal Year Maturity    
Estimated minimum funding required during 2017 $ 6