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Securities Available for Sale and Securities Held to Maturity - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
CreditScore
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Schedule of Available-for-sale Securities [Line Items]        
Securities available for sale Gross Unrealized Losses $ 273 $ 240    
Fair Isaac & Company minimum credit score for Prime loan origination 620      
Cash and cash equivalents 8,679 4,931 8,241 5,442
Loan-to-deposit ratio 16.00%      
Net impairment losses on securities 31 [1] 36 [1] 60 [1]  
Securities available for sale Amortized Cost 33,950 23,967    
Securities available for sale 33,965 23,993    
Alt-A residential mortgage backed securities
       
Schedule of Available-for-sale Securities [Line Items]        
Securities available for sale Amortized Cost 390      
Securities available for sale $ 279      
[1] Net impairment losses on securities include total other-than-temporary impairment losses of $18 million, $41 million, and $278 million, net of $(13) million, $5 million, and $218 million recognized in other comprehensive income in 2011, 2010, and 2009, respectively.