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Commitments and Contingencies (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases, Operating      
Operating leases, rent expense $ 70 $ 72 $ 75
Sublease rental income received 2 $ 4 $ 4
Operating leases:      
2018 36    
2019 31    
2020 24    
2021 22    
2022 18    
2023 and thereafter 46    
Total future minimum payments 177    
Minimum sublease rentals due in the future under non-cancelable subleases 22    
Purchase Obligations      
Total purchase commitments 59    
2018 48    
2019 through 2020 $ 11