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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, 2011
Dec. 31, 2010
Investment [Line Items]    
Securities available for sale Amortized Cost $ 33,950 $ 23,967
Securities available for sale Gross Unrealized Gains 288 266
Securities available for sale Gross Unrealized Losses 273 240
Securities available for sale 33,965 23,993
Securities held to maturity 15,108 17,762
Securities held to maturity Gross Unrealized Gains 433 223
Securities held to maturity Gross Unrealized Losses 2 137
Securities held to maturity, fair value 15,539 17,848
U.S. agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 20,666 12,879
Securities available for sale Gross Unrealized Gains 269 222
Securities available for sale Gross Unrealized Losses 14 3
Securities available for sale 20,921 [1] 13,098
Securities held to maturity 14,770 16,722
Securities held to maturity Gross Unrealized Gains 430 209
Securities held to maturity Gross Unrealized Losses 2 137
Securities held to maturity, fair value 15,198 [1] 16,794
Non-agency residential mortgage-backed securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 1,130 1,701
Securities available for sale Gross Unrealized Gains   3
Securities available for sale Gross Unrealized Losses 223 234
Securities available for sale 907 [1] 1,470
Certificates of deposit
   
Investment [Line Items]    
Securities available for sale Amortized Cost 3,623 1,874
Securities available for sale Gross Unrealized Gains 2 1
Securities available for sale Gross Unrealized Losses 3  
Securities available for sale 3,622 1,875
Corporate debt securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 3,592 2,261
Securities available for sale Gross Unrealized Gains 5 8
Securities available for sale Gross Unrealized Losses 26 1
Securities available for sale 3,571 2,268
U.S. agency notes
   
Investment [Line Items]    
Securities available for sale Amortized Cost 1,795 2,757
Securities available for sale Gross Unrealized Gains 5 23
Securities available for sale 1,800 2,780
Asset-backed and other securities
   
Investment [Line Items]    
Securities available for sale Amortized Cost 3,144  
Securities available for sale Gross Unrealized Gains 7  
Securities available for sale Gross Unrealized Losses 7  
Securities available for sale 3,144  
Other securities
   
Investment [Line Items]    
Securities held to maturity 338 1,040
Securities held to maturity Gross Unrealized Gains 3 14
Securities held to maturity, fair value 341 1,054
Asset-backed securities
   
Investment [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
[1] Residential 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.