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Note 14. Commitments And Contingencies Contingent Liability Letter of Credit (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Contingent liabilities of former parent, aggregate value $ 30  
Synthetic Letter of Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Outstanding letter of credit $ 53 $ 53