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Loans and Related Allowance for Credit Losses - (Subsequently Defaulted FDM) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024
Financing Receivable [Line Items] |  |
Subsequently default | $ 96 | $ 246
Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 62 | 89
Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 18 | 80
Repayment Plan |  |
Financing Receivable [Line Items] |  |
Subsequently default | 8 | 25
Payment Delay and Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 40
Other |  |
Financing Receivable [Line Items] |  |
Subsequently default | 5 | 12
Total commercial |  |
Financing Receivable [Line Items] |  |
Subsequently default | 68 | 174
Total commercial | Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 62 | 89
Total commercial | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 45
Total commercial | Payment Delay and Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 40
Total commercial | Commercial and industrial |  |
Financing Receivable [Line Items] |  |
Subsequently default | 41 | 76
Total commercial | Commercial and industrial | Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 35 | 61
Total commercial | Commercial and industrial | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 12
Total commercial | Commercial and industrial | Payment Delay and Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 3
Total commercial | Commercial real estate |  |
Financing Receivable [Line Items] |  |
Subsequently default | 27 | 98
Total commercial | Commercial real estate | Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default | 27 | 28
Total commercial | Commercial real estate | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default |  | 33
Total commercial | Commercial real estate | Payment Delay and Term Extension |  |
Financing Receivable [Line Items] |  |
Subsequently default |  | 37
Total consumer |  |
Financing Receivable [Line Items] |  |
Subsequently default | 28 | 72
Total consumer | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 15 | 35
Total consumer | Repayment Plan |  |
Financing Receivable [Line Items] |  |
Subsequently default | 8 | 25
Total consumer | Other |  |
Financing Receivable [Line Items] |  |
Subsequently default | 5 | 12
Total consumer | Residential real estate |  |
Financing Receivable [Line Items] |  |
Subsequently default | 17 | 38
Total consumer | Residential real estate | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 14 | 33
Total consumer | Residential real estate | Other |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 5
Total consumer | Home equity |  |
Financing Receivable [Line Items] |  |
Subsequently default | 3 | 10
Total consumer | Home equity | Payment Delay |  |
Financing Receivable [Line Items] |  |
Subsequently default | 1 | 2
Total consumer | Home equity | Repayment Plan |  |
Financing Receivable [Line Items] |  |
Subsequently default |  | 1
Total consumer | Home equity | Other |  |
Financing Receivable [Line Items] |  |
Subsequently default | 2 | 7
Total consumer | Credit card |  |
Financing Receivable [Line Items] |  |
Subsequently default | 8 | 24
Total consumer | Credit card | Repayment Plan |  |
Financing Receivable [Line Items] |  |
Subsequently default | $ 8 | $ 24

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