Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments (Details)

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Fair Value of Financial Instruments (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Carrying And Fair Values Of Financial Instruments [Abstract]    
Held-to-maturity debt securities, Amortized Cost $ 49,481,000,000 $ 35,265,000,000
Deposits 1,105,261,000,000 1,033,041,000,000
Long-term debt (includes $49,161 and $46,239 measured at fair value) 275,585,000,000 372,265,000,000
Carrying Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commercial Unfunded Lending Commitments 1,000,000,000 2,000,000,000
Carrying And Fair Values Of Financial Instruments [Abstract]    
Loans 859,875,000,000 870,520,000,000
Deposits 1,105,261,000,000 1,033,041,000,000
Long-term debt (includes $49,161 and $46,239 measured at fair value) 275,585,000,000 372,265,000,000
Loans Held For Sale 19,413,000,000  
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commercial Unfunded Lending Commitments 4,500,000,000 7,100,000,000
Carrying And Fair Values Of Financial Instruments [Abstract]    
Loans 877,880,000,000 849,685,000,000
Deposits 1,105,669,000,000 1,033,248,000,000
Long-term debt (includes $49,161 and $46,239 measured at fair value) 283,474,000,000 343,211,000,000
Loans Held For Sale 19,408,000,000  
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
   
Carrying And Fair Values Of Financial Instruments [Abstract]    
Loans 105,119,000,000  
Deposits 1,105,669,000,000  
Long-term debt (includes $49,161 and $46,239 measured at fair value) 281,173,000,000  
Loans Held For Sale 15,087,000,000  
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
   
Carrying And Fair Values Of Financial Instruments [Abstract]    
Loans 772,761,000,000  
Deposits     
Long-term debt (includes $49,161 and $46,239 measured at fair value) 2,301,000,000  
Loans Held For Sale $ 4,321,000,000