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Loans and Allowance for Credit Losses - Composition of Loan Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts Notes And Loans Receivable Classified [Abstract]    
Commercial $ 60,988 $ 60,742
Lease financing 5,335 5,481
Total commercial 66,323 66,223
Commercial Real Estate    
Commercial mortgages 31,155 31,005
Construction and development 6,245 5,948
Total commercial real estate 37,400 36,953
Residential mortgages 33,779 32,648
Home equity loans, first liens 12,205 11,370
Total residential mortgages 45,984 44,018
Credit card 16,229 17,115
Retail leasing 5,526 5,419
Home equity and second mortgages 16,131 16,726
Revolving credit 3,206 3,332
Installment 5,450 5,463
Automobile 12,474 12,593
Student 3,893 4,179
Total other retail 46,680 47,712
Total loans, excluding covered loans 212,616 212,021
Covered loans 10,735 11,308
Total loans $ 223,351 $ 223,329
Commercial, Percentage 27.30% 27.20%
Lease financing, Percentage 2.40% 2.50%
Total commercial, Percentage 29.70% 29.70%
Commercial mortgages, Percentage 13.90% 13.90%
Construction and development, Percentage 2.80% 2.60%
Total commercial real estate, Percentage 16.70% 16.50%
Residential mortgages, Percentage 15.10% 14.60%
Home equity loans, first liens, Percentage 5.50% 5.10%
Total residential mortgages, Percentage 20.60% 19.70%
Credit Card, Percentage 7.30% 7.70%
Retail leasing, Percentage 2.50% 2.40%
Home equity and second mortgages, Percentage 7.20% 7.50%
Revolving credit, Percentage 1.40% 1.50%
Installment, Percentage 2.40% 2.40%
Automobile, Percentage 5.60% 5.60%
Student, Percentage 1.80% 1.90%
Total other retail, Percentage 20.90% 21.30%
Total loans, excluding covered loans, Percentage 95.20% 94.90%
Covered Loans, Percentage 4.80% 5.10%
Total loans, Percentage 100.00% 100.00%