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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
Future non-cancelable commitments related to various operating and capital leases      
2013 $ 113    
2014 110    
2015 101    
2016 88    
2017 61    
Thereafter 343    
Total 816    
Expenditures related to leases 102 60 52
Other commitments      
2013 31    
2014 21    
2015 18    
2016 15    
2017 14    
Thereafter 37    
Total 136    
Total future non-cancelable commitments      
2013 144    
2014 131    
2015 119    
2016 103    
2017 75    
Thereafter 380    
Total $ 952