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Commitments and Contingencies Noncancelable Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum commitments      
2019 $ 296    
2020 286    
2021 247    
2022 180    
2023 146    
Thereafter 582    
Total 1,737    
Sublease income      
2019 (61)    
2020 (51)    
2021 (44)    
2022 (38)    
2023 (33)    
Thereafter (129)    
Totals (356)    
Net minimum commitments      
2019 235    
2020 235    
2021 203    
2022 142    
2023 113    
Thereafter 453    
Totals 1,381    
Rental expense under operating leases $ 300 $ 284 $ 270