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Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases, Operating [Abstract]      
2014 $ 201    
2015 163    
2016 135    
2017 119    
2018 89    
Thereafter 144    
Total noncancelable operating lease commitments 851    
Operating Leases, Rent Expense, Net [Abstract]      
Operating Leases, Rent Expense $ 217 $ 229 $ 228