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Commitments, Pledged Assets and Collateral - Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Future minimum rental payments under operating leases      
2013 $ 1,788    
2014 1,711    
2015 1,571    
2016 1,431    
2017 1,318    
After 2017 6,536    
Total minimum payments required 14,355    
Less: Sublease rentals under noncancelable subleases (1,732)    
Net minimum payment required 12,623    
Total rental expense      
Gross rental expense 2,212 2,228 2,212
Sublease rental income (288) (403) (545)
Net rental expense $ 1,924 $ 1,825 $ 1,667