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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
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 5,529 $ 5,902
Unpaid Principal Balance 7,202 7,879
Valuation Allowance 346 369
Commitments to Lend Additional Funds 289 160
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 849 520
Unpaid Principal Balance 1,364 1,110
Valuation Allowance 68 25
Commitments to Lend Additional Funds 284 154
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 293 336
Unpaid Principal Balance 697 847
Valuation Allowance 10 11
Commitments to Lend Additional Funds   1
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,274 2,575
Unpaid Principal Balance 2,847 3,248
Valuation Allowance 153 199
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 281 309
Unpaid Principal Balance 456 503
Valuation Allowance 22 35
Commitments to Lend Additional Funds 4 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 222 210
Unpaid Principal Balance 222 210
Valuation Allowance 64 57
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 3,919 3,950
Unpaid Principal Balance 5,586 5,918
Valuation Allowance 317 327
Commitments to Lend Additional Funds 288 159
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 36 39
Unpaid Principal Balance 42 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 1,574 1,913
Unpaid Principal Balance 1,574 1,913
Valuation Allowance $ 28 $ 40