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Note 9. Employee Benefit Plans Estimated Future Funding (Details) - Defined Benefit Pension Plan
$ in Millions
Dec. 31, 2017
USD ($)
Expected Future Benefit Payments, Fiscal Year Maturity  
2018 $ 9
2019 9
2020 9
2021 10
2022 10
2023 through 2027 47
Estimated minimum funding required during 2017 $ 3