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Loans and Related Allowance for Credit Losses (Aging Analysis) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis $ 2,270
Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1,756
30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 20
60-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 4
90 Days or More Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 7
Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 483
Total commercial lending  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 2,066
Total commercial lending | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1,691
Total commercial lending | 30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 14
Total commercial lending | 60-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis
Total commercial lending | 90 Days or More Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis
Total commercial lending | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 361
Total commercial lending | Commercial and industrial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1,099
Total commercial lending | Commercial and industrial | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 828
Total commercial lending | Commercial and industrial | 30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 14
Total commercial lending | Commercial and industrial | 60-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis
Total commercial lending | Commercial and industrial | 90 Days or More Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis
Total commercial lending | Commercial and industrial | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 257
Total commercial lending | Commercial real estate  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 967
Total commercial lending | Commercial real estate | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 863
Total commercial lending | Commercial real estate | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 104
Total consumer lending  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 204
Total consumer lending | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 65
Total consumer lending | 30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 6
Total consumer lending | 60-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 4
Total consumer lending | 90 Days or More Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 7
Total consumer lending | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 122
Total consumer lending | Residential real estate  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 109
Total consumer lending | Residential real estate | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 15
Total consumer lending | Residential real estate | 30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1
Total consumer lending | Residential real estate | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 93
Total consumer lending | Home equity  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 31
Total consumer lending | Home equity | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 4
Total consumer lending | Home equity | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 27
Total consumer lending | Credit card  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 58
Total consumer lending | Credit card | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 41
Total consumer lending | Credit card | 30-59 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 5
Total consumer lending | Credit card | 60-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 4
Total consumer lending | Credit card | 90 Days or More Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 7
Total consumer lending | Credit card | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1
Total consumer lending | Education  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 5
Total consumer lending | Education | Current or Less Than 30 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 5
Total consumer lending | Other consumer  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis 1
Total consumer lending | Other consumer | Nonperforming  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Financing receivable, aging analysis $ 1