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Loans - Summary of TDR and Related Credit Loss Reserves for TDR Loans (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]    
TDR Loans $ 1,391 $ 1,102
Allowance for credit losses on TDR Loans 151 121
Unpaid Principal Balance of TDR Loans 1,601 1,282
Commercial Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 492 473
Allowance for credit losses on TDR Loans 33 20
Unpaid Principal Balance of TDR Loans 567 580
Commercial Loans [Member] | Construction and Other Real Estate [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 375 342
Allowance for credit losses on TDR Loans 30 17
Unpaid Principal Balance of TDR Loans 407 393
Commercial Loans [Member] | Business Banking and Middle Markets Enterprises [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 84 94
Allowance for credit losses on TDR Loans 3 3
Unpaid Principal Balance of TDR Loans 124 147
Commercial Loans [Member] | Other Commercial [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 33 37
Unpaid Principal Balance of TDR Loans 36 40
Consumer Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 899 629
Allowance for credit losses on TDR Loans 118 101
Unpaid Principal Balance of TDR Loans 1,034 702
Consumer Loans [Member] | Residential Mortgage [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 883 608
Allowance for credit losses on TDR Loans 113 94
Unpaid Principal Balance of TDR Loans 1,018 682
Consumer Loans [Member] | Credit Card Receivables [Member]
   
Financing Receivable, Impaired [Line Items]    
TDR Loans 16 21
Allowance for credit losses on TDR Loans 5 7
Unpaid Principal Balance of TDR Loans $ 16 $ 20