v2.4.0.6
Securities Available for Sale Textuals (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Securities Available For Sale (Textual) [Abstract]      
Cost $ 215,571 $ 164,329  
Fair value 222,613 172,654  
Gross unrealized losses 3,169 2,711  
OTTI 541 692 1,094
Investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 45,405 27,477  
Gross unrealized losses 1,859 1,480  
Unrated Investment Grade Securities [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 6,200 1,300  
Gross unrealized losses 207 83  
Non-investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 8,147 7,177  
Gross unrealized losses 1,301 1,230  
Collateralized loan obligations [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Cost 8,100 4,000  
Fair value 8,100 4,200  
Residential [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Cost 16,997 18,294  
Fair value 17,836 20,203  
Gross unrealized losses 414 489  
OTTI 252 175 591
Residential [Member] | Investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 2,503 888  
Gross unrealized losses 39 23  
OTTI 5 5 24
Residential [Member] | Non-investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 4,717 4,575  
Gross unrealized losses 375 466  
OTTI 247 170 567
Asset-backed Securities Collateralized by Auto Leases [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Cost 6,700 6,200  
Fair value 6,700 6,400  
Asset-backed Securities Collateralized by Home Equity Loans [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Cost 846 927  
Fair value 932 1,100  
Federal agencies [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Cost 92,279 78,578  
Fair value 96,754 82,037  
Gross unrealized losses 10 96  
Federal agencies [Member] | Securities we Intend to Sell [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value   14,500  
OTTI   252  
Federal agencies [Member] | Investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 3,019 8,163  
Gross unrealized losses 10 96  
Federal agencies [Member] | Non-investment Grade [Member]
     
Securities Available For Sale (Textual) [Abstract]      
Fair value 0 0  
Gross unrealized losses $ 0 $ 0