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Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value 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 Amortized Cost $ 45,644 $ 33,950
Securities available for sale Gross Unrealized Gains 552 288
Securities available for sale Gross Unrealized Losses 73 273
Securities available for sale 46,123 33,965
Securities held to maturity 18,194 15,108
Securities held to maturity Gross Unrealized Gains 558 433
Securities held to maturity Gross Unrealized Losses 20 2
Securities held to maturity, fair value 18,732 15,539
U.S. agency mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 20,080 20,666
Securities available for sale Gross Unrealized Gains 396 269
Securities available for sale Gross Unrealized Losses   14
Securities available for sale 20,476 [1] 20,921
Securities held to maturity 17,750 14,770
Securities held to maturity Gross Unrealized Gains 558 430
Securities held to maturity Gross Unrealized Losses 19 2
Securities held to maturity, fair value 18,289 [1] 15,198
Asset-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 8,104 2,638
Securities available for sale Gross Unrealized Gains 62 4
Securities available for sale Gross Unrealized Losses 2 7
Securities available for sale 8,164 2,635
Corporate debt securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 6,197 3,592
Securities available for sale Gross Unrealized Gains 61 5
Securities available for sale Gross Unrealized Losses 2 26
Securities available for sale 6,256 3,571
Certificates of deposit
   
Investment [Line Items]    
Securities available for sale Amortized Cost 6,150 3,623
Securities available for sale Gross Unrealized Gains 12 2
Securities available for sale Gross Unrealized Losses 1 3
Securities available for sale 6,161 3,622
U.S. agency notes
   
Investment [Line Items]    
Securities available for sale Amortized Cost 3,465 1,795
Securities available for sale Gross Unrealized Gains 2 5
Securities available for sale Gross Unrealized Losses 3  
Securities available for sale 3,464 1,800
Non-agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 796 1,130
Securities available for sale Gross Unrealized Gains 2  
Securities available for sale Gross Unrealized Losses 65 223
Securities available for sale 733 [1] 907
Commercial paper
   
Investment [Line Items]    
Securities available for sale Amortized Cost 574 225
Securities available for sale 574 225
Other securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 278 281
Securities available for sale Gross Unrealized Gains 17 3
Securities available for sale 295 284
Securities held to maturity 444 338
Securities held to maturity Gross Unrealized Gains   3
Securities held to maturity Gross Unrealized Losses 1  
Securities held to maturity, fair value $ 443 $ 341
[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.