v2.4.0.6
Intangible Assets, Allocation of Goodwill to Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Dec. 31, 2012
Intangible Assets [Abstract]      
Goodwill, Beginning Balance $ 25,115 $ 25,637 $ 25,637
Goodwill from business combinations 25    
Goodwill, Ending Balance 25,140 25,637 25,637
Wealth Brokerage and Retirement [Member]
      
Intangible Assets [Abstract]      
Goodwill, Beginning Balance 371 371 371
Goodwill from business combinations 0    
Goodwill, Ending Balance 371 371 371
Wholesale Banking [Member]
      
Intangible Assets [Abstract]      
Goodwill, Beginning Balance 6,820 7,344 7,344
Goodwill from business combinations 27    
Goodwill, Ending Balance 6,847 7,344 7,344
Community Banking [Member]
      
Intangible Assets [Abstract]      
Goodwill, Beginning Balance 17,924 17,922 17,922
Goodwill from business combinations (2)    
Goodwill, Ending Balance $ 17,922 $ 17,922 $ 17,922