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Note 10. Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ 106 $ 113 $ 111 $ 78
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       34
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 $ 1   2  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns        
Unrecognized Tax Benefits, Beginning of Period 106 113 111  
Gross increases—tax positions in prior periods   1 7  
Gross decreases—tax positions in prior periods (4) (8)    
Gross increases—tax positions in current period 1 3 3  
Settlements (23) (1) (3)  
Reduction due to lapse of statute of limitations (2) (2) (5)  
Unrecognized Tax Benefits, End of Period $ 78 $ 106 $ 113