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Rental Expense and Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rental Expense and Lease Commitments      
Rental expense $ 1,767 $ 1,836 $ 1,727
Operating lease commitments      
Gross minimum rental commitments (including vacant space below) for 2013 1,466    
Gross minimum rental commitments (including vacant space below) for 2014 1,268    
Gross minimum rental commitments (including vacant space below) for 2015 1,044    
Gross minimum rental commitments (including vacant space below) for 2016 746    
Gross minimum rental commitments (including vacant space below) for 2017 535    
Gross minimum rental commitments (including vacant space below) beyond 2017 747    
Vacant space for 2013 21    
Vacant space for 2014 13    
Vacant space for 2015 7    
Vacant space for 2016 3    
Vacant space for 2017 1    
Vacant space beyond 2017 0    
Sublease income commitments for 2013 26    
Sublease income commitments for 2014 16    
Sublease income commitments for 2015 11    
Sublease income commitments for 2016 9    
Sublease income commitments for 2017 4    
Sublease income commitments beyond 2017 1    
Capital Leases      
Capital lease commitments for 2013 13    
Capital lease commitments for 2014 12    
Capital lease commitments for 2015 11    
Capital lease commitments for 2016 8    
Capital lease commitments for 2017 10    
Capital lease commitments beyond 2017 $ 6