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Loans and Allowance for Credit Losses - Loans Modified by Class and Delinquency Status (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance $ 717
Commercial Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 182
Commercial Real Estate Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 40
Residential Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 332 [1]
Credit Card Receivable [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 94
Other Retail Loans [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 69
Financial Asset, Not Past Due [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 591
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 146
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 6
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 319 [1]
Financial Asset, Not Past Due [Member] | Credit Card Receivable [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 56
Financial Asset, Not Past Due [Member] | Other Retail Loans [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 64
Financing Receivables 30 To 89 Days Past Due [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 40
Financing Receivables 30 To 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 6
Financing Receivables 30 To 89 Days Past Due [Member] | Residential Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 3 [1]
Financing Receivables 30 To 89 Days Past Due [Member] | Credit Card Receivable [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 28
Financing Receivables 30 To 89 Days Past Due [Member] | Other Retail Loans [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 86
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 30
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 34
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 10 [1]
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Credit Card Receivable [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance 10
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Retail Loans [Member]  
Financing Receivable, Modifications [Line Items]  
Loans modified during the period excluding forbearance $ 2
[1] At March 31, 2023, $32 million of loans 30-89 days past due and $1 million of loans 90 days or more past due purchased and that could be purchased from GNMA mortgage pools under delinquent loan repurchase options whose payments are insured by the Federal Housing administration or guaranteed by the United States Department of Veterans Affairs, were classified as current.