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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 $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost$ 28,872$ 23,967
Securities available for sale Gross Unrealized Gains326266
Securities available for sale Gross Unrealized Losses236240
Securities available for sale28,96223,993
Securities held to maturity15,77517,762
Securities held to maturity Gross Unrealized Gains524223
Securities held to maturity Gross Unrealized Losses1137
Securities held to maturity, fair value16,29817,848
U.S. agency residential mortgage-backed securities
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost17,43312,879
Securities available for sale Gross Unrealized Gains302222
Securities available for sale Gross Unrealized Losses113
Securities available for sale17,724[1]13,098
Securities held to maturity15,38816,722
Securities held to maturity Gross Unrealized Gains521209
Securities held to maturity Gross Unrealized Losses1137
Securities held to maturity, fair value15,908[1]16,794
Non-agency residential mortgage-backed securities
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost1,2431,701
Securities available for sale Gross Unrealized Gains13
Securities available for sale Gross Unrealized Losses210234
Securities available for sale1,034[1]1,470
Corporate debt securities
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost3,0212,261
Securities available for sale Gross Unrealized Gains48
Securities available for sale Gross Unrealized Losses131
Securities available for sale3,0122,268
Securities held to maturity216338
Securities held to maturity Gross Unrealized Gains15
Securities held to maturity, fair value217343
U.S. agency notes
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost2,2602,757
Securities available for sale Gross Unrealized Gains823
Securities available for sale2,2682,780
Certificates of deposit
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost2,0981,874
Securities available for sale Gross Unrealized Gains41
Securities available for sale Gross Unrealized Losses1 
Securities available for sale2,1011,875
Asset-backed securities
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost 2,495
Securities available for sale Gross Unrealized Gains 9
Securities available for sale Gross Unrealized Losses 2
Securities available for sale 2,502
Securities held to maturity171702
Securities held to maturity Gross Unrealized Gains29
Securities held to maturity, fair value173711
Asset-backed and other securities
  
Gain (Loss) on Investments [Line Items]  
Securities available for sale Amortized Cost2,817 
Securities available for sale Gross Unrealized Gains7 
Securities available for sale Gross Unrealized Losses1 
Securities available for sale$ 2,823 
[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.