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Commitments and Contingencies (Future Minimum Operating Lease Payments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Total $ 707    
Operating leases, rent expense 179 $ 160 $ 149
Real Estate Leases      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 148    
2020 125    
2021 102    
2022 71    
2023 43    
Thereafter 47    
Total 536    
Equipment Leases      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 45    
2020 39    
2021 30    
2022 23    
2023 17    
Thereafter 17    
Total $ 171