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Note 10. Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ (78) $ (106) $ (113) $ (78)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       70
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit       $ 3
Unrecognized Tax Benefits, Statute of Limitations, Scheduled Expiration as of Reporting Date 12 months      
Increase (Decrease) in Interest Accrued for Unrecognized Tax Benefits $ 4 1    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Unrecognized Tax Benefits, Beginning of Period (78) (106) (113)  
Gross increases—tax positions in prior periods 3   1  
Gross decreases—tax positions in prior periods   (4) (8)  
Gross increases—tax positions in current period   (1) (3)  
Settlements   23 1  
Reduction due to lapse of statute of limitations (3) (2) (2)  
Unrecognized Tax Benefits, End of Period $ (78) $ (78) $ (106)