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Composition of the Company's Loan Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 121,470 [1] $ 122,495 [1]
Loans Held for Sale 3,399 [2] 2,353
Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 54,048 49,538
Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,127 5,094
Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 713 1,240
Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,389 [3] 23,243 [3]
Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,805 [3] 15,765 [3]
Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 753 [3] 980 [3]
Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,400 7,200
Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,396 [4] 2,059 [4]
Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 10,998 [4] 10,165 [4]
Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 632 [4] 540 [4]
Commercial Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 58,888 55,872
Commercial Portfolio Segment [Member] | Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 54,048 49,538
Commercial Portfolio Segment [Member] | Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,127 5,094
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 713 1,240
Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 43,199 46,660
Residential Portfolio Segment [Member] | Residential Guaranteed
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,252 6,672
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,389 [5] 23,243 [6]
Residential Portfolio Segment [Member] | Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,805 15,765
Residential Portfolio Segment [Member] | Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 753 980
Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 19,383 19,963
Consumer Portfolio Segment [Member] | Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,357 7,199
Consumer Portfolio Segment [Member] | Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,396 2,059
Consumer Portfolio Segment [Member] | Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 10,998 10,165
Consumer Portfolio Segment [Member] | Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 632 540
Loans Held For Investment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 121,470 [7] 122,495 [7]
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   55,872
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 54,048 49,538
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,127 5,094
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 713 1,240
Loans Held For Investment [Member] | Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   46,660
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Guaranteed
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,252 6,672
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,389 [8] 23,243 [8]
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,805 15,765
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 753 980
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   19,963
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,357 7,199
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,396 2,059
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 10,998 10,165
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 632 540
Commercial Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Commercial Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 58,888  
Residential Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 43,199  
Consumer Portfolio Segment [Member] | Loans | Loans Held For Investment [Member] | Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 19,383  
[1] 2 Includes loans of consolidated VIEs365 3,322
[2] 1 Includes loans held for sale, at fair value, of consolidated VIEs319 315
[3] Excludes $4.3 billion and $6.7 billion at December 31, 2012 and 2011, respectively, of guaranteed residential loans. At both December 31, 2012 and 2011, the majority of these loans had FICO scores of 700 and above.
[4] Excludes $5.4 billion and $7.2 billion at December 31, 2012 and 2011, respectively, of guaranteed student loans.
[5] Includes $379 million of loans carried at fair value, the majority of which were accruing current.
[6] Includes $431 million of loans carried at fair value, the majority of which were accruing current.
[7] Loans are presented net of unearned income, unamortized discounts and premiums, and net deferred loan costs of $639 million and $716 million at December 31, 2012 and 2011, respectively.
[8] Includes $379 million and $431 million of loans carried at fair value at December 31, 2012 and 2011, respectively.