v2.4.0.6
Preferred Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Detail of Preferred Stock [Abstract]    
Preferred Stock Shares Authorized And Designated 10,104,610 10,047,010
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 10,558,865 10,450,690
Par value $ 14,282 $ 12,830
Carrying value 12,883 11,431
Discount 1,399 1,399
ESOP Shares issued and outstanding 910,934 858,759
ESOP Par value 911 859
ESOP Carrying value 911 859
ESOP Discount 0 0
Series G - 7.25% Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 15,000 $ 15,000
Preferred Stock Shares Authorized And Designated 50,000 50,000
Series H - Floating Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 20,000 $ 20,000
Preferred Stock Shares Authorized And Designated 50,000 50,000
Series I - Floating Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 100,000 $ 100,000
Preferred Stock Shares Authorized And Designated 25,010 25,010
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 25,010 25,010
Par value 2,501 2,501
Carrying value 2,501 2,501
Discount 0 0
Series J - 8.00% Non-Cumulative Perpetual Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock Shares Authorized And Designated 2,300,000 2,300,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 2,150,375 2,150,375
Par value 2,150 2,150
Carrying value 1,995 1,995
Discount 155 155
Series K - 7.98% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock Shares Authorized And Designated 3,500,000 3,500,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 3,352,000 3,352,000
Par value 3,352 3,352
Carrying value 2,876 2,876
Discount 476 476
Series L - 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock Shares Authorized And Designated 4,025,000 4,025,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 3,968,000 3,968,000
Par value 3,968 3,968
Carrying value 3,200 3,200
Discount 768 768
Series N - 5.20% Non-Cumulative Perpetual Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 25,000 $ 0
Preferred Stock Shares Authorized And Designated 30,000 0
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 30,000 0
Par value 750 0
Carrying value 750 0
Discount 0 0
Series O - 5.125% Non-Cumulative Perpetual Class A Preferred Stock [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 25,000 $ 0
Preferred Stock Shares Authorized And Designated 27,600 0
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 26,000 0
Par value 650 0
Carrying value 650 0
Discount 0 0
Dividend Equalization Preferred [Member]
    
Detail of Preferred Stock [Abstract]    
Preferred Stock, Liquidation Preference Per Share $ 10 $ 10
Preferred Stock Shares Authorized And Designated 97,000 97,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 96,546 96,546
Par value 0 0
Carrying value 0 0
Discount $ 0 $ 0