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Note 13. Commitments And Contingencies Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 163    
2019 142    
2020 116    
2021 91    
2022 72    
Thereafter 196    
Total future minimum operating lease payments due 780    
Capital lease obligations 29 $ 27  
Imputed interest 2 2  
Rent expense $ 192 $ 186 $ 179