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Commitments and Contingencies (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases, Operating      
Operating leases, rent expense $ 72 $ 75 $ 79
Sublease rental income received 4 $ 4 $ 4
Operating leases:      
2017 51    
2018 47    
2019 40    
2020 33    
2021 17    
2022 and thereafter 38    
Total future minimum payments 226    
Minimum sublease rentals due in the future under non-cancelable subleases 28    
Purchase Obligations      
Total purchase commitments 103    
2017 55    
2018 through 2019 40    
2020 through 2021 5    
2022 and thereafter $ 3