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Maturities of Securities Available for Sale and Securities Held to Maturity (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investment [Line Items]    
Securities available for sale fair value Within 1 year $ 5,494  
Securities available for sale fair value After 1 year through 5 years 6,677  
Securities available for sale fair value After 5 years through 10 years 4,729  
Securities available for sale fair value After 10 years 25,548  
Securities available for sale 42,448 33,965
Securities available for sale Within 1 year amortized cost 5,484  
Securities available for sale After 1 year through 5 years amortized cost 6,617  
Securities available for sale After 5 years through 10 years amortized cost 4,565  
Securities available for sale After 10 years amortized cost 25,282  
Securities available for sale Amortized Cost 41,948 33,950
Securities held to maturity Within 1 year     
Securities held to maturity After 1 year through 5 years 162  
Securities held to maturity After 5 years through 10 years 7,049  
Securities held to maturity After 10 years 9,018  
Securities held to maturity, fair value 16,229 15,539
Securities held to maturity Within 1 year amortized cost     
Securities held to maturity After 1 year through 5 years amortized cost 162  
Securities held to maturity After 5 years through 10 years amortized cost 6,678  
Securities held to maturity After 10 years amortized cost 8,772  
Securities held to maturity 15,612 15,108
U.S. agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 2 [1]  
Securities available for sale fair value After 5 years through 10 years 4,031 [1]  
Securities available for sale fair value After 10 years 19,739 [1]  
Securities available for sale 23,772 [1] 20,921
Securities available for sale Amortized Cost 23,298 20,666
Securities held to maturity Within 1 year    [1]  
Securities held to maturity After 5 years through 10 years 7,049 [1]  
Securities held to maturity After 10 years 9,018 [1]  
Securities held to maturity, fair value 16,067 [1] 15,198
Securities held to maturity 15,450 14,770
Other securities
   
Investment [Line Items]    
Securities held to maturity Within 1 year     
Securities held to maturity After 1 year through 5 years 162  
Securities held to maturity, fair value 162 341
Securities held to maturity 162 338
Non-agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale fair value After 5 years through 10 years 8 [1]  
Securities available for sale fair value After 10 years 774 [1]  
Securities available for sale 782 [1] 907
Securities available for sale Amortized Cost 856 1,130
Corporate debt securities
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 1,015  
Securities available for sale fair value After 1 year through 5 years 4,595  
Securities available for sale 5,610 3,571
Securities available for sale Amortized Cost 5,555 3,592
Certificates of deposit
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 4,030  
Securities available for sale fair value After 1 year through 5 years 1,506  
Securities available for sale 5,536 3,622
Securities available for sale Amortized Cost 5,524 3,623
Commercial paper
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 449  
Securities available for sale 449 225
Securities available for sale Amortized Cost 449 225
U.S. agency notes
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 100  
Securities available for sale fair value After 5 years through 10 years 250  
Securities available for sale 350 1,800
Securities available for sale Amortized Cost 350 1,795
Asset-backed and other securities
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 474  
Securities available for sale fair value After 5 years through 10 years 440  
Securities available for sale fair value After 10 years 5,035  
Securities available for sale 5,949 2,919
Securities available for sale Amortized Cost $ 5,916 $ 2,919
[1] Residential mortgage-backed securities have been allocated over maturity groupings based on final contractual maturities. Actual maturities will differ from final contractual maturities because borrowers on a certain portion of loans underlying these securities have the right to prepay their obligations.