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Loans and Allowance for Credit Losses - Activity in Allowance for Credit Losses (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period $ 4,733 $ 5,014
Provision for credit losses 403 481
Loans charged off 549 681
Less recoveries of loans charged off (116) (110)
Net loans charged off 433 571
Net change for credit losses to be reimbursed by the FDIC 5 (5)
Balance at end of period 4,708 4,919
Commercial [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 1,051 1,010
Provision for credit losses (4) 105
Loans charged off 56 113
Less recoveries of loans charged off (21) (27)
Net loans charged off 35 86
Balance at end of period 1,012 1,029
Commercial Real Estate [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 857 1,154
Provision for credit losses (40) (46)
Loans charged off 43 83
Less recoveries of loans charged off (24) (12)
Net loans charged off 19 71
Balance at end of period 798 1,037
Residential Mortgages [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 935 927
Provision for credit losses 83 112
Loans charged off 100 116
Less recoveries of loans charged off (8) (4)
Net loans charged off 92 112
Balance at end of period 926 927
Credit Card [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 863 992
Provision for credit losses 192 178
Loans charged off 193 201
Less recoveries of loans charged off (33) (32)
Net loans charged off 160 169
Balance at end of period 895 1,001
Other Retail [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 848 831
Provision for credit losses 132 124
Loans charged off 156 167
Less recoveries of loans charged off (30) (35)
Net loans charged off 126 132
Balance at end of period 854 823
Total loans, excluding covered loans [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 4,554 4,914
Provision for credit losses 363 473
Loans charged off 548 680
Less recoveries of loans charged off (116) (110)
Net loans charged off 432 570
Balance at end of period 4,485 4,817
Covered Loans [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 179 100
Provision for credit losses 40 8
Loans charged off 1 1
Net loans charged off 1 1
Net change for credit losses to be reimbursed by the FDIC 5 (5)
Balance at end of period $ 223 $ 102