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Note 10. Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ (22) $ (78) $ (78) $ (20)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       17
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit       $ 1
Unrecognized Tax Benefits, Statute of Limitations, Scheduled Expiration as of Reporting Date 12 months      
Increase (Decrease) in Interest Accrued for Unrecognized Tax Benefits $ 1 2 4  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Unrecognized Tax Benefits, Beginning of Period 22 78 78  
Gross increases—tax positions in prior periods   1 3  
Reduction due to lapse of statute of limitations (2) (3) (3)  
Gross decreases—tax positions in prior periods   (54)    
Unrecognized Tax Benefits, End of Period $ 20 $ 22 $ 78