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Loans - Summary of Nonaccrual Loans and Accruing Receivables 90 Days or More Delinquent (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans $ 1,686 $ 664
Accruing Loans Contractually Past Due 90 days or More 21 30
Nonaccrual Loans With No Allowance For Credit Losses 400 428
Residential mortgage loans carried at lower of cost or fair value of the collateral less cost to sell 375 289
Commercial Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 544 237
Accruing Loans Contractually Past Due 90 days or More 0 1
Nonaccrual Loans With No Allowance For Credit Losses 125 139
Commercial Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 44 6
Accruing Loans Contractually Past Due 90 days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 31 3
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 163 82
Accruing Loans Contractually Past Due 90 days or More 0 1
Nonaccrual Loans With No Allowance For Credit Losses 1 19
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 337 149
Accruing Loans Contractually Past Due 90 days or More 0 0
Nonaccrual Loans With No Allowance For Credit Losses 93 117
Consumer Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 1,142 427
Accruing Loans Contractually Past Due 90 days or More 21 29
Nonaccrual Loans With No Allowance For Credit Losses 275 289
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans [1],[2],[3] 1,079 381
Accruing Loans Contractually Past Due 90 days or More [1],[2],[3] 0 0
Nonaccrual Loans With No Allowance For Credit Losses [1],[2],[3] 241 257
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans [1],[3] 63 46
Accruing Loans Contractually Past Due 90 days or More [1],[3] 0 0
Nonaccrual Loans With No Allowance For Credit Losses [1],[3] 34 32
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 0 0
Accruing Loans Contractually Past Due 90 days or More 19 24
Nonaccrual Loans With No Allowance For Credit Losses 0 0
Consumer Loans [Member] | Other consumer [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans 0 0
Accruing Loans Contractually Past Due 90 days or More 2 5
Nonaccrual Loans With No Allowance For Credit Losses 0 $ 0
Consumer Loans [Member] | Mortgages [Member] | Cares Act Election [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans $ 590  
[1] At December 31, 2020 and 2019, nonaccrual consumer mortgage loans include $375 million and $289 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell. The decrease in nonaccrual consumer mortgage loans with no allowance for credit losses at December 31, 2020 reflects the impact of adopting new accounting guidance which requires expected recoveries related to subsequent increases in the fair value of collateral for collateral-dependent loans to be recognized in the allowance for credit losses beginning January 1, 2020. See Note 2, "Summary of Significant Accounting Policies and New Accounting Pronouncements," for additional discussion.
[2] Nonaccrual consumer mortgage loans for all periods does not include guaranteed loans purchased from the Government National Mortgage Association. Repayment of these loans is predominantly insured by the Federal Housing Administration and as such, these loans have different risk characteristics from the rest of our consumer loan portfolio.
[3] Nonaccrual consumer mortgage loans include all loans which are 90 or more days contractually delinquent as well as loans discharged under Chapter 7 bankruptcy and not re-affirmed and second lien loans where the first lien loan that we own or service is 90 or more days contractually delinquent. At December 31, 2020, nonaccrual consumer mortgage loans also include $590 million of loans under COVID-19 related payment deferral programs where the borrowers utilized a payment deferral of more than six months and, as a result, have been placed on nonaccrual status.