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Note 14. Commitments And Contingencies Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 $ 151    
2017 125    
2018 93    
2019 72    
2020 53    
Thereafter 179    
Total future minimum operating lease payments due 673    
Capital lease obligations 26 $ 19  
Imputed interest 2 1  
Rent expense $ 179 $ 166 $ 165