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Composition of the Company's Loan Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 122,031 [1] $ 121,470 [1]
Loans Held for Sale 3,647 [2] 3,399
Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 55,070 54,048
Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,308 4,127
Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 667 713
Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,341 [3] 23,389 [3]
Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,682 [3] 14,805 [3]
Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 635 [3] 753 [3]
Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,400 5,400
Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,483 [4] 2,396 [4]
Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 11,151 [4] 10,998 [4]
Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 641 [4] 632 [4]
Commercial Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 60,045 58,888
Commercial Portfolio Segment [Member] | Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 55,070 54,048
Commercial Portfolio Segment [Member] | Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,308 4,127
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 667 713
Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 42,280 43,199
Residential Portfolio Segment [Member] | Residential Guaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 3,622 4,252
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,341 [5] 23,389 [6]
Residential Portfolio Segment [Member] | Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,682 14,805
Residential Portfolio Segment [Member] | Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 635 753
Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 19,706 19,383
Consumer Portfolio Segment [Member] | Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,431 5,357
Consumer Portfolio Segment [Member] | Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,483 2,396
Consumer Portfolio Segment [Member] | Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 11,151 10,998
Consumer Portfolio Segment [Member] | Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 641 632
Loans Held For Investment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 122,031 121,470
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   58,888
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 55,070 54,048
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,308 4,127
Loans Held For Investment [Member] | Commercial Portfolio Segment [Member] | Commercial Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 667 713
Loans Held For Investment [Member] | Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   43,199
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Guaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 3,622 4,252
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 23,341 [7] 23,389 [7]
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Home Equity
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 14,682 14,805
Loans Held For Investment [Member] | Residential Portfolio Segment [Member] | Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 635 753
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment   19,383
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Guaranteed Student Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,431 5,357
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Other Direct
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 2,483 2,396
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Indirect
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 11,151 10,998
Loans Held For Investment [Member] | Consumer Portfolio Segment [Member] | Consumer Credit Card
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 641 632
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 60,045  
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 42,280  
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 $ 19,706  
[1] 2 Includes loans of consolidated VIEs345 365
[2] 1 Includes loans held for sale, at fair value, of consolidated VIEs$289 $319
[3] Excludes $3.6 billion and $4.3 billion at June 30, 2013 and December 31, 2012, respectively, of guaranteed residential loans. At June 30, 2013 and December 31, 2012, the majority of these loans had FICO scores of 700 and above.
[4] Excludes $5.4 billion of guaranteed student loans at June 30, 2013 and December 31, 2012
[5] 1Includes $339 million of loans carried at fair value, the majority of which were accruing current.
[6] Includes $379 million of loans carried at fair value, the majority of which were accruing current.
[7] Includes $339 million and $379 million of loans carried at fair value at June 30, 2013 and December 31, 2012, respectively.