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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, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 4,543 $ 4,674
Unpaid Principal Balance 5,714 5,698
Valuation Allowance 247 254
Commitments to Lend Additional Funds 159 113
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 521 467
Unpaid Principal Balance 1,140 1,006
Valuation Allowance 39 32
Commitments to Lend Additional Funds 156 106
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 229 279
Unpaid Principal Balance 556 511
Valuation Allowance 8 12
Commitments to Lend Additional Funds   2
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,620 1,709
Unpaid Principal Balance 1,772 1,879
Valuation Allowance 78 86
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 317 335
Unpaid Principal Balance 390 418
Valuation Allowance 14 14
Commitments to Lend Additional Funds 3 5
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 258 245
Unpaid Principal Balance 258 245
Valuation Allowance 77 69
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,945 3,035
Unpaid Principal Balance 4,116 4,059
Valuation Allowance 216 213
Commitments to Lend Additional Funds 159 113
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,598 1,639
Unpaid Principal Balance 1,598 1,639
Valuation Allowance $ 31 $ 41