v2.4.0.6
Securities Available for Sale, Gross Unrealized Losses and Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses $ (343) $ (916)
Less than 12 months, Fair Value 25,750 39,083
12 months or more, Gross Unrealized Losses (1,621) (2,253)
12 months or more, Fair Value 14,945 14,530
Total Gross Unrealized Losses (1,964) (3,169)
Total, Fair Value 40,695 53,613
Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (331) (894)
Less than 12 months, Fair Value 25,514 38,706
12 months or more, Gross Unrealized Losses (1,589) (2,212)
12 months or more, Fair Value 14,399 14,000
Total Gross Unrealized Losses (1,920) (3,106)
Total, Fair Value 39,913 52,706
US Treasury and Government [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (7) (11)
Less than 12 months, Fair Value 3,562 5,473
12 months or more, Gross Unrealized Losses 0 0
12 months or more, Fair Value 0 0
Total Gross Unrealized Losses (7) (11)
Total, Fair Value 3,562 5,473
US States and Political Subdivisions [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (77) (229)
Less than 12 months, Fair Value 3,059 8,501
12 months or more, Gross Unrealized Losses (410) (654)
12 months or more, Fair Value 4,072 4,348
Total Gross Unrealized Losses (487) (883)
Total, Fair Value 7,131 12,849
Mortgage Backed Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (89) (244)
Less than 12 months, Fair Value 11,309 9,355
12 months or more, Gross Unrealized Losses (797) (1,108)
12 months or more, Fair Value 8,621 8,031
Total Gross Unrealized Losses (886) (1,352)
Total, Fair Value 19,930 17,386
Federal agencies [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (35) (7)
Less than 12 months, Fair Value 9,621 2,392
12 months or more, Gross Unrealized Losses (2) (3)
12 months or more, Fair Value 761 627
Total Gross Unrealized Losses (37) (10)
Total, Fair Value 10,382 3,019
Residential [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (8) (80)
Less than 12 months, Fair Value 971 3,780
12 months or more, Gross Unrealized Losses (236) (334)
12 months or more, Fair Value 3,565 3,440
Total Gross Unrealized Losses (244) (414)
Total, Fair Value 4,536 7,220
Commercial [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (46) (157)
Less than 12 months, Fair Value 717 3,183
12 months or more, Gross Unrealized Losses (559) (771)
12 months or more, Fair Value 4,295 3,964
Total Gross Unrealized Losses (605) (928)
Total, Fair Value 5,012 7,147
Corporate debt securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (63) (205)
Less than 12 months, Fair Value 2,143 8,107
12 months or more, Gross Unrealized Losses (72) (81)
12 months or more, Fair Value 256 167
Total Gross Unrealized Losses (135) (286)
Total, Fair Value 2,399 8,274
Collateralized debt obligations [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (54) (150)
Less than 12 months, Fair Value 2,622 4,268
12 months or more, Gross Unrealized Losses (180) (199)
12 months or more, Fair Value 771 613
Total Gross Unrealized Losses (234) (349)
Total, Fair Value 3,393 4,881
Other Debt Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (41) (55)
Less than 12 months, Fair Value 2,819 3,002
12 months or more, Gross Unrealized Losses (130) (170)
12 months or more, Fair Value 679 841
Total Gross Unrealized Losses (171) (225)
Total, Fair Value 3,498 3,843
Equity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (12) (22)
Less than 12 months, Fair Value 236 377
12 months or more, Gross Unrealized Losses (32) (41)
12 months or more, Fair Value 546 530
Total Gross Unrealized Losses (44) (63)
Total, Fair Value 782 907
Perpetual preferred securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses (12) (13)
Less than 12 months, Fair Value 236 316
12 months or more, Gross Unrealized Losses (31) (41)
12 months or more, Fair Value 543 530
Total Gross Unrealized Losses (43) (54)
Total, Fair Value 779 846
Other equity securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 months, Gross Unrealized Losses 0 (9)
Less than 12 months, Fair Value 0 61
12 months or more, Gross Unrealized Losses (1) 0
12 months or more, Fair Value 3 0
Total Gross Unrealized Losses (1) (9)
Total, Fair Value $ 3 $ 61