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Note 10. Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ (78) $ (78) $ (106) $ (22)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       19
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit       $ 2
Unrecognized Tax Benefits, Statute of Limitations, Scheduled Expiration as of Reporting Date 12 months      
Increase (Decrease) in Interest Accrued for Unrecognized Tax Benefits $ 2 4    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Unrecognized Tax Benefits, Beginning of Period 78 78 106  
Gross decreases—tax positions in prior periods (54)   (4)  
Gross increases—tax positions in current period     1  
Gross increases—tax positions in prior periods 1 3    
Settlements     (23)  
Reduction due to lapse of statute of limitations (3) (3) (2)  
Unrecognized Tax Benefits, End of Period $ 22 $ 78 $ 78