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Rental Expense and Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Rental Expense and Lease Commitments      
Rental expense $ 1,759 $ 1,767 $ 1,836
Operating lease commitments      
Gross minimum rental commitments (including vacant space below) for 2014 1,492    
Gross minimum rental commitments (including vacant space below) for 2015 1,286    
Gross minimum rental commitments (including vacant space below) for 2016 1,016    
Gross minimum rental commitments (including vacant space below) for 2017 799    
Gross minimum rental commitments (including vacant space below) for 2018 620    
Gross minimum rental commitments (including vacant space below) beyond 2018 778    
Vacant space for 2014 24    
Vacant space for 2015 16    
Vacant space for 2016 6    
Vacant space for 2017 4    
Vacant space for 2018 1    
Vacant space beyond 2018 0    
Sublease income commitments for 2014 22    
Sublease income commitments for 2015 16    
Sublease income commitments for 2016 14    
Sublease income commitments for 2017 9    
Sublease income commitments for 2018 4    
Sublease income commitments beyond 2018 7    
Capital Leases      
Capital lease commitments for 2014 16    
Capital lease commitments for 2015 12    
Capital lease commitments for 2016 13    
Capital lease commitments for 2017 3    
Capital lease commitments for 2018 9    
Capital lease commitments beyond 2018 $ 5