v2.4.0.6
Securities Available for Sale, Gross Unrealized Losses and Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses $ (916) $ (553)
Less than 12 months, Fair Value 39,083 20,456
12 months or more, Gross Unrealized Losses (2,253) (2,158)
12 months or more, Fair Value 14,530 14,205
Total Gross Unrealized Losses (3,169) (2,711)
Total, Fair Value 53,613 34,661
Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (894) (512)
Less than 12 months, Fair Value 38,706 19,494
12 months or more, Gross Unrealized Losses (2,212) (2,109)
12 months or more, Fair Value 14,000 13,731
Total Gross Unrealized Losses (3,106) (2,621)
Total, Fair Value 52,706 33,225
US Treasury and Government [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (11) (15)
Less than 12 months, Fair Value 5,473 544
12 months or more, Gross Unrealized Losses 0 0
12 months or more, Fair Value 0 0
Total Gross Unrealized Losses (11) (15)
Total, Fair Value 5,473 544
US States and Political Subdivisions [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (229) (322)
Less than 12 months, Fair Value 8,501 6,242
12 months or more, Gross Unrealized Losses (654) (515)
12 months or more, Fair Value 4,348 2,720
Total Gross Unrealized Losses (883) (837)
Total, Fair Value 12,849 8,962
Mortgage Backed Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (244) (139)
Less than 12 months, Fair Value 9,355 9,567
12 months or more, Gross Unrealized Losses (1,108) (1,081)
12 months or more, Fair Value 8,031 9,641
Total Gross Unrealized Losses (1,352) (1,220)
Total, Fair Value 17,386 19,208
Federal agencies [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (7) (95)
Less than 12 months, Fair Value 2,392 8,103
12 months or more, Gross Unrealized Losses (3) (1)
12 months or more, Fair Value 627 60
Total Gross Unrealized Losses (10) (96)
Total, Fair Value 3,019 8,163
Residential [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (80) (35)
Less than 12 months, Fair Value 3,780 1,023
12 months or more, Gross Unrealized Losses (334) (454)
12 months or more, Fair Value 3,440 4,440
Total Gross Unrealized Losses (414) (489)
Total, Fair Value 7,220 5,463
Commercial [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (157) (9)
Less than 12 months, Fair Value 3,183 441
12 months or more, Gross Unrealized Losses (771) (626)
12 months or more, Fair Value 3,964 5,141
Total Gross Unrealized Losses (928) (635)
Total, Fair Value 7,147 5,582
Corporate debt securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (205) (10)
Less than 12 months, Fair Value 8,107 477
12 months or more, Gross Unrealized Losses (81) (27)
12 months or more, Fair Value 167 157
Total Gross Unrealized Losses (286) (37)
Total, Fair Value 8,274 634
Collateralized debt obligations [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (150) (13)
Less than 12 months, Fair Value 4,268 679
12 months or more, Gross Unrealized Losses (199) (216)
12 months or more, Fair Value 613 456
Total Gross Unrealized Losses (349) (229)
Total, Fair Value 4,881 1,135
Other Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (55) (13)
Less than 12 months, Fair Value 3,002 1,985
12 months or more, Gross Unrealized Losses (170) (270)
12 months or more, Fair Value 841 757
Total Gross Unrealized Losses (225) (283)
Total, Fair Value 3,843 2,742
Equity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (22) (41)
Less than 12 months, Fair Value 377 962
12 months or more, Gross Unrealized Losses (41) (49)
12 months or more, Fair Value 530 474
Total Gross Unrealized Losses (63) (90)
Total, Fair Value 907 1,436
Perpetual preferred securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (13) (41)
Less than 12 months, Fair Value 316 962
12 months or more, Gross Unrealized Losses (41) (48)
12 months or more, Fair Value 530 467
Total Gross Unrealized Losses (54) (89)
Total, Fair Value 846 1,429
Other equity securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (9) 0
Less than 12 months, Fair Value 61 0
12 months or more, Gross Unrealized Losses 0 (1)
12 months or more, Fair Value 0 7
Total Gross Unrealized Losses (9) (1)
Total, Fair Value $ 61 $ 7