v2.4.0.8
Securities Available for Sale, Unrealized Loss Position, by Credit Rating (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses $ (3,827) $ (1,054)
Fair value 249,439 235,199
Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (3,779) (1,005)
Fair value 246,682 232,414
US Treasury and Government [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (261) 0
Fair value 6,383 7,146
US States and Political Subdivisions [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (800) (444)
Fair value 40,890 38,676
Mortgage Backed Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (2,435) (321)
Fair value 143,984 133,184
Federal agencies [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (2,192) (4)
Fair value 110,561 97,285
Residential [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (65) (49)
Fair value 14,117 15,931
Commercial [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (178) (268)
Fair value 19,306 19,968
Corporate debt securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (161) (69)
Fair value 21,002 21,333
Collateralized loan and other debt obligations [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (78) (95)
Fair value 17,201 13,188
Other Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (44) (76)
Fair value 17,222 18,887
Equity Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (48) (49)
Fair value 2,757 2,785
Perpetual preferred securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (32) (40)
Fair value 2,160 2,176
Investment Grade [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (3,483) (573)
Fair value 87,992 18,139
Investment Grade [Member] | Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (3,451) (533)
Fair value 87,382 17,485
Investment Grade [Member] | US Treasury and Government [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (261) 0
Fair value 5,883 0
Investment Grade [Member] | US States and Political Subdivisions [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (744) (378)
Fair value 12,866 6,839
Investment Grade [Member] | Mortgage Backed Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (2,259) (38)
Fair value 57,576 4,435
Investment Grade [Member] | Federal agencies [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (2,192) (4)
Fair value 53,578 2,247
Investment Grade [Member] | Residential [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (6) (3)
Fair value 266 78
Investment Grade [Member] | Commercial [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (61) (31)
Fair value 3,732 2,110
Investment Grade [Member] | Corporate debt securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (98) (19)
Fair value 2,486 1,112
Investment Grade [Member] | Collateralized loan and other debt obligations [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (50) (49)
Fair value 4,068 2,065
Investment Grade [Member] | Other Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (39) (49)
Fair value 4,503 3,034
Investment Grade [Member] | Perpetual preferred securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (32) (40)
Fair value 610 654
Non-investment Grade [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (328) (472)
Fair value 4,959 3,981
Non-investment Grade [Member] | Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (328) (472)
Fair value 4,959 3,981
Non-investment Grade [Member] | US Treasury and Government [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses 0 0
Fair value 0 0
Non-investment Grade [Member] | US States and Political Subdivisions [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (56) (66)
Fair value 669 532
Non-investment Grade [Member] | Mortgage Backed Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (176) (283)
Fair value 3,059 2,692
Non-investment Grade [Member] | Federal agencies [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses 0 0
Fair value 0 0
Non-investment Grade [Member] | Residential [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (59) (46)
Fair value 2,240 1,747
Non-investment Grade [Member] | Commercial [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (117) (237)
Fair value 819 945
Non-investment Grade [Member] | Corporate debt securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (63) (50)
Fair value 924 410
Non-investment Grade [Member] | Collateralized loan and other debt obligations [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (28) (46)
Fair value 226 218
Non-investment Grade [Member] | Other Debt Securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses (5) (27)
Fair value 81 129
Non-investment Grade [Member] | Perpetual preferred securities [Member]
   
Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract]    
Gross unrealized losses 0 0
Fair value $ 0 $ 0