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Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases, Operating [Abstract]      
2016 $ 218    
2017 175    
2018 142    
2019 111    
2020 87    
Thereafter 196    
Total noncancelable operating lease commitments 929    
Rent expense $ 238 $ 228 $ 217