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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, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment $ 4,674 $ 5,027
Unpaid Principal Balance 5,698 6,205
Valuation Allowance 254 279
Commitments to Lend Additional Funds 113 204
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 467 550
Unpaid Principal Balance 1,006 915
Valuation Allowance 32 44
Commitments to Lend Additional Funds 106 199
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 279 280
Unpaid Principal Balance 511 596
Valuation Allowance 12 11
Commitments to Lend Additional Funds 2  
Residential Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,709 1,946
Unpaid Principal Balance 1,879 2,339
Valuation Allowance 86 116
Commitments to Lend Additional Funds   1
Other Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 335 302
Unpaid Principal Balance 418 400
Valuation Allowance 14 22
Commitments to Lend Additional Funds 5 4
Credit Card [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 245 230
Unpaid Principal Balance 245 230
Valuation Allowance 69 60
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 3,035 3,346
Unpaid Principal Balance 4,059 4,524
Valuation Allowance 213 254
Commitments to Lend Additional Funds 113 204
Covered Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment   38
Unpaid Principal Balance   44
Valuation Allowance   1
Government National Mortgage Association [Member]    
Financing Receivable, Impaired [Line Items]    
Period-end Recorded Investment 1,639 1,681
Unpaid Principal Balance 1,639 1,681
Valuation Allowance $ 41 $ 25