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Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases, Operating [Abstract]      
2017 $ 206    
2018 170    
2019 141    
2020 118    
2021 96    
Thereafter 205    
Total noncancelable operating lease commitments 936    
Rent expense $ 234 $ 238 $ 228