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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
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 5,447 $ 5,902
Unpaid Principal Balance 7,157 7,879
Valuation Allowance 365 369
Commitments to Lend Additional Funds 383 160
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 825 520
Unpaid Principal Balance 1,354 1,110
Valuation Allowance 68 25
Commitments to Lend Additional Funds 378 154
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 379 336
Unpaid Principal Balance 790 847
Valuation Allowance 8 11
Commitments to Lend Additional Funds 1 1
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,363 2,575
Unpaid Principal Balance 2,952 3,248
Valuation Allowance 165 199
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 281 309
Unpaid Principal Balance 457 503
Valuation Allowance 30 35
Commitments to Lend Additional Funds 3 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 217 210
Unpaid Principal Balance 217 210
Valuation Allowance 62 57
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 4,065 3,950
Unpaid Principal Balance 5,770 5,918
Valuation Allowance 333 327
Commitments to Lend Additional Funds 382 159
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 38 39
Unpaid Principal Balance 43 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 1,344 1,913
Unpaid Principal Balance 1,344 1,913
Valuation Allowance $ 31 $ 40