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Composition of the Company's Loan Portfolio (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Document Period End Date Mar. 31, 2017  
Loans held for investment [1] $ 143,529 $ 143,298
Loans Held for Sale [2] 2,109 4,169
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 68,971 69,213
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 5,067 4,996
Commercial Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 4,215 4,015
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 78,253 78,224
Federal National Mortgage Association (FNMA) Insured Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 549 537
Residential Nonguaranteed [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [3],[4] 26,110 26,137
Home Equity Line of Credit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [3] 11,511 11,912
Residential Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [3] 380 404
Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 38,550 38,990
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment 6,396 6,167
Consumer Other Direct [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [5] 7,904 7,771
Consumer Indirect [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [5] 11,067 10,736
Credit Card Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment [5] 1,359 1,410
Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for investment $ 26,726 $ 26,084
[1] Includes loans of consolidated VIEs of $201 million and $211 million at March 31, 2017 and December 31, 2016, respectively.
[2] Includes $1.8 billion and $3.5 billion of LHFS measured at fair value at March 31, 2017 and December 31, 2016, respectively.
[3] Excludes $549 million and $537 million of guaranteed residential loans at March 31, 2017 and December 31, 2016, respectively.
[4] Includes $221 million and $222 million of LHFI measured at fair value at March 31, 2017 and December 31, 2016, respectively.
[5] Excludes $6.4 billion and $6.2 billion of guaranteed student loans at March 31, 2017 and December 31, 2016, respectively.