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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Capital lease agreement period 3 years    
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013 $ 398    
2014 278    
2015 125    
2016 20    
2017 15    
Thereafter 143    
Total minimum lease payments 979    
Less: amount representing interest and taxes (123)    
Less: current portion of the present value of minimum lease payments (365) (279)  
Capital lease obligations, less current portion 491 398  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013 142    
2014 128    
2015 117    
2016 110    
2017 102    
Thereafter 252    
Total minimum lease payments 851    
Operating lease expense 196 219 178
Other contractual commitments      
Other contractual commitments $ 749    
Min
     
Leases [Abstract]      
Interest rate 1.00%    
Max
     
Leases [Abstract]      
Interest rate 13.00%    
Expiration date of lease 2027    
Buildings
     
Leases [Abstract]      
Capital lease agreement period 15 years