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Bank Loans and Related Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 40 | $ 35
Accrued interest | 211 | 171
Residential real estate | First Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Bank loans | $ 25,100 |
Percent of loans with interest-only payments | 24.00% |
Percent of interest only adjustable rate | 71.00% |
Total bank loans | $ 29,361 | 27,389
Residential real estate | First Mortgages | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Fixed rate interest rate period | 3 years |
Adjusting rate interest rate period | 6 months |
Interest-only reset period | 3 years |
Residential real estate | First Mortgages | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Fixed rate interest rate period | 10 years |
Adjusting rate interest rate period | 12 months |
Residential real estate | HELOCs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan term | 30 years |
Initial draw period | 10 years |
Converting to amortizing loans period | 20 years |
Total bank loans | $ 421 | $ 424
Percent of loan balance outstanding, borrowers paid only minimum due | 64.00% |
Residential real estate | Home Equity Secured By Second Liens |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total bank loans | $ 328 |

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