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Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 367
Pre-Modification Outstanding Recorded Investment |  | $ 91
Post-Modification Outstanding Recorded Investment | $ 21 | $ 85
Consumer: | Credit card and other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 81
Pre-Modification Outstanding Recorded Investment |  | $ 12
Post-Modification Outstanding Recorded Investment |  | $ 12
C&I | Commercial: | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 6
Pre-Modification Outstanding Recorded Investment |  | $ 30
Post-Modification Outstanding Recorded Investment |  | $ 24
CRE | Commercial: | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 1
Post-Modification Outstanding Recorded Investment |  | $ 1
HELOC | Consumer: | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 98
Pre-Modification Outstanding Recorded Investment |  | $ 7
Post-Modification Outstanding Recorded Investment |  | $ 7
Real estate installment loans | Consumer: | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan |  | 181
Pre-Modification Outstanding Recorded Investment |  | $ 41
Post-Modification Outstanding Recorded Investment |  | $ 41

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