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Commitments and Contingencies Noncancelable Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Minimum commitments      
2018 $ 284    
2019 268    
2020 222    
2021 189    
2022 123    
Thereafter 372    
Sublease income      
2018 (62)    
2019 (63)    
2020 (50)    
2021 (43)    
2022 (38)    
Thereafter (166)    
Net minimum commitments      
2018 222    
2019 205    
2020 172    
2021 146    
2022 85    
Thereafter 206    
Rental expense under operating leases $ 284 $ 270 $ 317