v2.4.0.6
Securities Available for Sale, Gross Unrealized Losses and Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses $ (333) $ (108)
Less than 12 months, Fair Value 38,385 10,727
12 months or more, Gross Unrealized Losses (719) (946)
12 months or more, Fair Value 9,464 11,441
Total Gross Unrealized Losses (1,052) (1,054)
Total, Fair Value 47,849 22,168
Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (322) (96)
Less than 12 months, Fair Value 38,152 10,563
12 months or more, Gross Unrealized Losses (697) (909)
12 months or more, Fair Value 9,018 10,903
Total Gross Unrealized Losses (1,019) (1,005)
Total, Fair Value 47,170 21,466
US Treasury and Government [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (12) 0
Less than 12 months, Fair Value 4,369 0
12 months or more, Gross Unrealized Losses 0 0
12 months or more, Fair Value 0 0
Total Gross Unrealized Losses (12) 0
Total, Fair Value 4,369 0
US States and Political Subdivisions [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (81) (55)
Less than 12 months, Fair Value 5,053 2,709
12 months or more, Gross Unrealized Losses (320) (389)
12 months or more, Fair Value 4,031 4,662
Total Gross Unrealized Losses (401) (444)
Total, Fair Value 9,084 7,371
Mortgage Backed Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (201) (14)
Less than 12 months, Fair Value 22,572 2,999
12 months or more, Gross Unrealized Losses (207) (307)
12 months or more, Fair Value 3,243 4,128
Total Gross Unrealized Losses (408) (321)
Total, Fair Value 25,815 7,127
Federal agencies [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (171) (4)
Less than 12 months, Fair Value 20,109 2,247
12 months or more, Gross Unrealized Losses 0 0
12 months or more, Fair Value 0 0
Total Gross Unrealized Losses (171) (4)
Total, Fair Value 20,109 2,247
Residential [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (16) (4)
Less than 12 months, Fair Value 791 261
12 months or more, Gross Unrealized Losses (26) (45)
12 months or more, Fair Value 975 1,564
Total Gross Unrealized Losses (42) (49)
Total, Fair Value 1,766 1,825
Commercial [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (14) (6)
Less than 12 months, Fair Value 1,672 491
12 months or more, Gross Unrealized Losses (181) (262)
12 months or more, Fair Value 2,268 2,564
Total Gross Unrealized Losses (195) (268)
Total, Fair Value 3,940 3,055
Corporate debt securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (15) (14)
Less than 12 months, Fair Value 1,351 1,217
12 months or more, Gross Unrealized Losses (45) (55)
12 months or more, Fair Value 249 305
Total Gross Unrealized Losses (60) (69)
Total, Fair Value 1,600 1,522
Collateralized loan and other debt obligations [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (2) (2)
Less than 12 months, Fair Value 2,879 1,485
12 months or more, Gross Unrealized Losses (67) (93)
12 months or more, Fair Value 490 798
Total Gross Unrealized Losses (69) (95)
Total, Fair Value 3,369 2,283
Other Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (11) (11)
Less than 12 months, Fair Value 1,928 2,153
12 months or more, Gross Unrealized Losses (58) (65)
12 months or more, Fair Value 1,005 1,010
Total Gross Unrealized Losses (69) (76)
Total, Fair Value 2,933 3,163
Equity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (11) (12)
Less than 12 months, Fair Value 233 164
12 months or more, Gross Unrealized Losses (22) (37)
12 months or more, Fair Value 446 538
Total Gross Unrealized Losses (33) (49)
Total, Fair Value 679 702
Perpetual preferred securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (3) (3)
Less than 12 months, Fair Value 175 116
12 months or more, Gross Unrealized Losses (22) (37)
12 months or more, Fair Value 446 538
Total Gross Unrealized Losses (25) (40)
Total, Fair Value 621 654
Other equity securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (8) (9)
Less than 12 months, Fair Value 58 48
12 months or more, Gross Unrealized Losses 0 0
12 months or more, Fair Value 0 0
Total Gross Unrealized Losses (8) (9)
Total, Fair Value $ 58 $ 48