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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
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 5,514 $ 5,529
Unpaid Principal Balance 6,936 7,202
Valuation Allowance 326 346
Commitments to Lend Additional Funds 369 289
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 784 849
Unpaid Principal Balance 1,168 1,364
Valuation Allowance 69 68
Commitments to Lend Additional Funds 365 284
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 263 293
Unpaid Principal Balance 624 697
Valuation Allowance 9 10
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,206 2,274
Unpaid Principal Balance 2,700 2,847
Valuation Allowance 129 153
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 279 281
Unpaid Principal Balance 455 456
Valuation Allowance 19 22
Commitments to Lend Additional Funds 3 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 229 222
Unpaid Principal Balance 229 222
Valuation Allowance 65 64
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 3,761 3,919
Unpaid Principal Balance 5,176 5,586
Valuation Allowance 291 317
Commitments to Lend Additional Funds 368 288
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 36 36
Unpaid Principal Balance 43 42
Valuation Allowance 1 1
Commitments to Lend Additional Funds 1 1
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,717 1,574
Unpaid Principal Balance 1,717 1,574
Valuation Allowance $ 34 $ 28