v2.4.0.6
Preferred Stock (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Detail of Preferred Stock [Abstract]    
Preferred Stock Shares Authorized And Designated 10,047,010 10,047,010
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Shares issued and outstanding 9,591,931 9,591,931
Par value 11,971,000,000 11,971,000,000
Carrying value 10,572,000,000 10,572,000,000
Discount 1,399,000,000 1,399,000,000
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 1,529,065 858,759
Carrying value 1,529,000,000 859,000,000
Unearned ESOP shares (1,659,000,000) (926,000,000)
Employee Stock Ownership Plan Preferred Stock 2003 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 6,231 6,231
Carrying value 6,000,000 6,000,000
Employee Stock Ownership Plan Preferred Stock 2003 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 8.50% 8.50%
Employee Stock Ownership Plan Preferred Stock 2003 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 9.50% 9.50%
Employee Stock Ownership Plan Preferred Stock 2004 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 17,115 17,115
Carrying value 17,000,000 17,000,000
Employee Stock Ownership Plan Preferred Stock 2004 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 8.50% 8.50%
Employee Stock Ownership Plan Preferred Stock 2004 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 9.50% 9.50%
Employee Stock Ownership Plan Preferred Stock 2005 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 30,092 30,092
Carrying value 30,000,000 30,000,000
Employee Stock Ownership Plan Preferred Stock 2005 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 9.75% 9.75%
Employee Stock Ownership Plan Preferred Stock 2005 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.75% 10.75%
Employee Stock Ownership Plan Preferred Stock 2006 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 46,112 46,112
Carrying value 46,000,000 46,000,000
Employee Stock Ownership Plan Preferred Stock 2006 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.75% 10.75%
Employee Stock Ownership Plan Preferred Stock 2006 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 11.75% 11.75%
Employee Stock Ownership Plan Preferred Stock 2007 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 68,414 68,414
Carrying value 69,000,000 69,000,000
Employee Stock Ownership Plan Preferred Stock 2007 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.75% 10.75%
Employee Stock Ownership Plan Preferred Stock 2007 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 11.75% 11.75%
Employee Stock Ownership Plan Preferred Stock 2008 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 89,154 89,154
Carrying value 89,000,000 89,000,000
Employee Stock Ownership Plan Preferred Stock 2008 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.50% 10.50%
Employee Stock Ownership Plan Preferred Stock 2008 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 11.50% 11.50%
Employee Stock Ownership Plan Preferred Stock 2010 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 231,361 231,361
Carrying value 232,000,000 232,000,000
Employee Stock Ownership Plan Preferred Stock 2010 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 9.50% 9.50%
Employee Stock Ownership Plan Preferred Stock 2010 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.50% 10.50%
Employee Stock Ownership Plan Preferred Stock 2011 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 370,280 370,280
Carrying value 370,000,000 370,000,000
Employee Stock Ownership Plan Preferred Stock 2011 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 9.00% 9.00%
Employee Stock Ownership Plan Preferred Stock 2011 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.00% 10.00%
Employee Stock Ownership Plan Preferred Stock 2012 [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Shares issued and outstanding 670,306 0
Carrying value 670,000,000 0
Employee Stock Ownership Plan Preferred Stock 2012 [Member] | Minimum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 10.00%  
Employee Stock Ownership Plan Preferred Stock 2012 [Member] | Maximum [Member]
   
Detail of Employee Stock Ownership Plan Preferred Stock [Abstract]    
Adjustable Dividend Rate 11.00%  
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 - 5.80% Fixed-to-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 2,501,000,000 2,501,000,000
Carrying value 2,501,000,000 2,501,000,000
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 2,150,000,000 2,150,000,000
Carrying value 1,995,000,000 1,995,000,000
Discount 155,000,000 155,000,000
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 3,352,000,000 3,352,000,000
Carrying value 2,876,000,000 2,876,000,000
Discount 476,000,000 476,000,000
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 3,968,000,000 3,968,000,000
Carrying value 3,200,000,000 3,200,000,000
Discount 768,000,000 768,000,000
Dividend Equalization Preferred Shares [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