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Note 9. Employee Benefit Plans Other Employee Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Employee Benefit Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Benefit Obligation $ 7 $ 8  
Defined Contribution Savings Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension and Other Postretirement Benefit Expense $ 14 $ 12 $ 10