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Bank Loans and Related Allowance for Credit Losses - Convert to Amortizing Loans (Details) - Residential real estate - HELOCs - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Converted to an amortizing loan by period end | $ 120 | $ 120 |
Within 1 year | 15 | 15 |
> 1 year – 3 years | 38 | 38 |
> 3 years – 5 years | 48 | 48 |
> 5 years | 200 | 200 |
Total loans | 421 | 421 | $ 424
Converted to amortizing loans during the period | $ 3 | $ 11 |

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