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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, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 4,609 $ 4,674
Unpaid Principal Balance 5,790 5,698
Valuation Allowance 264 254
Commitments to Lend Additional Funds 139 113
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 502 467
Unpaid Principal Balance 1,096 1,006
Valuation Allowance 50 32
Commitments to Lend Additional Funds 136 106
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 266 279
Unpaid Principal Balance 619 511
Valuation Allowance 7 12
Commitments to Lend Additional Funds   2
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,684 1,709
Unpaid Principal Balance 1,843 1,879
Valuation Allowance 82 86
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 325 335
Unpaid Principal Balance 400 418
Valuation Allowance 15 14
Commitments to Lend Additional Funds 3 5
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 254 245
Unpaid Principal Balance 254 245
Valuation Allowance 74 69
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 3,031 3,035
Unpaid Principal Balance 4,212 4,059
Valuation Allowance 228 213
Commitments to Lend Additional Funds 139 113
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,578 1,639
Unpaid Principal Balance 1,578 1,639
Valuation Allowance $ 36 $ 41