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Loans and Allowance for Credit Losses - Summary of Impaired Loans, which Include Nonaccrual and TDR Loans, by Portfolio Class (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 5,667 $ 5,902
Unpaid Principal Balance 7,462 7,879
Valuation Allowance 363 369
Commitments to Lend Additional Funds 610 160
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 865 520
Unpaid Principal Balance 1,416 1,110
Valuation Allowance 63 25
Commitments to Lend Additional Funds 604 154
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 288 336
Unpaid Principal Balance 745 847
Valuation Allowance 4 11
Commitments to Lend Additional Funds 1 1
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,400 2,575
Unpaid Principal Balance 3,005 3,248
Valuation Allowance 173 199
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 294 309
Unpaid Principal Balance 472 503
Valuation Allowance 30 35
Commitments to Lend Additional Funds 4 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 211 210
Unpaid Principal Balance 211 210
Valuation Allowance 58 57
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 4,058 3,950
Unpaid Principal Balance 5,849 5,918
Valuation Allowance 328 327
Commitments to Lend Additional Funds 609 159
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 37 39
Unpaid Principal Balance 41 48
Valuation Allowance 1 2
Commitments to Lend Additional Funds 1 1
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,572 1,913
Unpaid Principal Balance 1,572 1,913
Valuation Allowance $ 34 $ 40