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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, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 4,443 $ 4,674
Unpaid Principal Balance 5,780 5,698
Valuation Allowance 249 254
Commitments to Lend Additional Funds 160 113
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 483 467
Unpaid Principal Balance 1,048 1,006
Valuation Allowance 39 32
Commitments to Lend Additional Funds 158 106
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 242 279
Unpaid Principal Balance 603 511
Valuation Allowance 7 12
Commitments to Lend Additional Funds   2
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,515 1,709
Unpaid Principal Balance 1,827 1,879
Valuation Allowance 71 86
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 318 335
Unpaid Principal Balance 417 418
Valuation Allowance 12 14
Commitments to Lend Additional Funds 2 5
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 263 245
Unpaid Principal Balance 263 245
Valuation Allowance 81 69
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 2,821 3,035
Unpaid Principal Balance 4,158 4,059
Valuation Allowance 210 213
Commitments to Lend Additional Funds 160 113
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,622 1,639
Unpaid Principal Balance 1,622 1,639
Valuation Allowance $ 39 $ 41