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Note 9. Employee Benefit Plans Changes in Benefit Obligations and Plan Assets Table (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Net Periodic Benefit Cost    
Net periodic pension cost $ 1 $ 1
Interest cost 6 6
Actuarial loss 2 2
Expected return on plan assets (7) (8)
Benefit Obligations    
Benefit Obligation 147 149
Fair value of plan assets 104 106
Underfunded at end of year $ 43 $ 43