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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, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 5,418 $ 5,529
Unpaid Principal Balance 6,825 7,202
Valuation Allowance 299 346
Commitments to Lend Additional Funds 255 289
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 656 849
Unpaid Principal Balance 1,133 1,364
Valuation Allowance 50 68
Commitments to Lend Additional Funds 250 284
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 281 293
Unpaid Principal Balance 581 697
Valuation Allowance 11 10
Commitments to Lend Additional Funds 1  
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,158 2,274
Unpaid Principal Balance 2,587 2,847
Valuation Allowance 127 153
Commitments to Lend Additional Funds 1  
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 278 281
Unpaid Principal Balance 474 456
Valuation Allowance 21 22
Commitments to Lend Additional Funds 3 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 230 222
Unpaid Principal Balance 230 222
Valuation Allowance 64 64
Total Loans, Excluding GNMA and Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 3,603 3,919
Unpaid Principal Balance 5,005 5,586
Valuation Allowance 273 317
Commitments to Lend Additional Funds 255 288
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 41 36
Unpaid Principal Balance 46 42
Valuation Allowance 1 1
Commitments to Lend Additional Funds   1
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,774 1,574
Unpaid Principal Balance 1,774 1,574
Valuation Allowance $ 25 $ 28