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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating leases,minimum rental commitments[Abstract]      
Minimum rental commitments under noncancellable operating leases due within one year of the balance sheet date $ 201    
Minimum rental commitments under noncancellable operating leases due in two years of the balance sheet date 174    
Minimum rental commitments under noncancellable operating leases due in three years of the balance sheet date 153    
Minimum rental commitments under noncancellable operating leases due in four years of the balance sheet date 141    
Minimum rental commitments under noncancellable operating leases due in five years of the balance sheet date 123    
Minimum rental commitments under noncancellable operating leases due after five years of the balance sheet date 490    
Operating leases, rental expense [Abstract]      
Rental expense 245 220 212
Contractual commitments (Abstract)      
Contractual commitments, amount 460    
Contingencies [Abstract]      
Loss Contingency, Range of Possible Loss, Minimum 0    
Loss Contingency, Range of Possible Loss, Maximum 200    
Brazilian internal revenue authority, matter 1 113    
Brazilian internal revenue authority, matter 2 67    
European competition matters - Swiss competition law authority 5    
European competition matters - Spanish competition law authority 3    
European competition matters - Italian competition law authority $ 3