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Maturities of Securities Available for Sale and Securities Held to Maturity (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Investment [Line Items]    
Securities available for sale fair value Within 1 year $ 6,280  
Securities available for sale fair value After 1 year through 5 years 8,265  
Securities available for sale fair value After 5 years through 10 years 7,230  
Securities available for sale fair value After 10 years 24,348  
Securities available for sale 46,123 33,965
Securities available for sale Within 1 year amortized cost 6,268  
Securities available for sale After 1 year through 5 years amortized cost 8,201  
Securities available for sale After 5 years through 10 years amortized cost 7,062  
Securities available for sale After 10 years amortized cost 24,113  
Securities available for sale Amortized Cost 45,644 33,950
Securities held to maturity Within 1 year     
Securities held to maturity After 1 year through 5 years 100  
Securities held to maturity After 5 years through 10 years 10,248  
Securities held to maturity After 10 years 8,384  
Securities held to maturity, fair value 18,732 15,539
Securities held to maturity Within 1 year amortized cost     
Securities held to maturity After 1 year through 5 years amortized cost 100  
Securities held to maturity After 5 years through 10 years amortized cost 9,911  
Securities held to maturity After 10 years amortized cost 8,183  
Securities held to maturity 18,194 15,108
U.S. agency mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 40 [1]  
Securities available for sale fair value After 5 years through 10 years 4,050 [1]  
Securities available for sale fair value After 10 years 16,386 [1]  
Securities available for sale 20,476 [1] 20,921
Securities available for sale Amortized Cost 20,080 20,666
Securities held to maturity Within 1 year    [1]  
Securities held to maturity After 5 years through 10 years 9,956 [1]  
Securities held to maturity After 10 years 8,333 [1]  
Securities held to maturity, fair value 18,289 [1] 15,198
Securities held to maturity 17,750 14,770
Asset-backed securities
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 438  
Securities available for sale fair value After 5 years through 10 years 785  
Securities available for sale fair value After 10 years 6,941  
Securities available for sale 8,164 2,635
Securities available for sale Amortized Cost 8,104 2,638
Corporate debt securities
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 1,149  
Securities available for sale fair value After 1 year through 5 years 4,883  
Securities available for sale fair value After 5 years through 10 years 224  
Securities available for sale 6,256 3,571
Securities available for sale Amortized Cost 6,197 3,592
Certificates of deposit
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 4,557  
Securities available for sale fair value After 1 year through 5 years 1,604  
Securities available for sale 6,161 3,622
Securities available for sale Amortized Cost 6,150 3,623
U.S. agency notes
   
Investment [Line Items]    
Securities available for sale fair value After 1 year through 5 years 1,300  
Securities available for sale fair value After 5 years through 10 years 2,164  
Securities available for sale 3,464 1,800
Securities available for sale Amortized Cost 3,465 1,795
Non-agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale fair value After 5 years through 10 years 7 [1]  
Securities available for sale fair value After 10 years 726 [1]  
Securities available for sale 733 [1] 907
Securities available for sale Amortized Cost 796 1,130
Commercial paper
   
Investment [Line Items]    
Securities available for sale fair value Within 1 year 574  
Securities available for sale 574 225
Securities available for sale Amortized Cost 574 225
Other securities
   
Investment [Line Items]    
Securities available for sale fair value After 10 years 295  
Securities available for sale 295 284
Securities available for sale Amortized Cost 278 281
Securities held to maturity Within 1 year     
Securities held to maturity After 1 year through 5 years 100  
Securities held to maturity After 5 years through 10 years 292  
Securities held to maturity After 10 years 51  
Securities held to maturity, fair value 443 341
Securities held to maturity $ 444 $ 338
[1] Mortgage-backed securities have been allocated to 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.