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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
Jun. 30, 2012
Dec. 31, 2011
Investment [Line Items]    
Securities available for sale Amortized Cost $ 39,802 $ 33,950
Securities available for sale Gross Unrealized Gains 411 288
Securities available for sale Gross Unrealized Losses 164 273
Securities available for sale 40,049 33,965
Securities held to maturity 15,506 15,108
Securities held to maturity Gross Unrealized Gains 505 433
Securities held to maturity Gross Unrealized Losses 2 2
Securities held to maturity, fair value 16,009 15,539
U.S. agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 24,041 20,666
Securities available for sale Gross Unrealized Gains 354 269
Securities available for sale Gross Unrealized Losses 8 14
Securities available for sale 24,387 [1] 20,921
Securities held to maturity 15,227 14,770
Securities held to maturity Gross Unrealized Gains 504 430
Securities held to maturity Gross Unrealized Losses 1 2
Securities held to maturity, fair value 15,730 [1] 15,198
Non-agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 923 1,130
Securities available for sale Gross Unrealized Gains 1  
Securities available for sale Gross Unrealized Losses 148 223
Securities available for sale 776 [1] 907
Certificates of deposit
   
Investment [Line Items]    
Securities available for sale Amortized Cost 5,348 3,623
Securities available for sale Gross Unrealized Gains 11 2
Securities available for sale Gross Unrealized Losses 3 3
Securities available for sale 5,356 3,622
Corporate debt securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 4,825 3,592
Securities available for sale Gross Unrealized Gains 23 5
Securities available for sale Gross Unrealized Losses 3 26
Securities available for sale 4,845 3,571
U.S. agency notes
   
Investment [Line Items]    
Securities available for sale Amortized Cost 100 1,795
Securities available for sale Gross Unrealized Gains 1 5
Securities available for sale 101 1,800
Asset-backed and other securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 4,565 3,144
Securities available for sale Gross Unrealized Gains 21 7
Securities available for sale Gross Unrealized Losses 2 7
Securities available for sale 4,584 3,144
Other securities
   
Investment [Line Items]    
Securities held to maturity 279 338
Securities held to maturity Gross Unrealized Gains 1 3
Securities held to maturity Gross Unrealized Losses 1  
Securities held to maturity, fair value $ 279 $ 341
[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.