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MORTGAGE LOANS ON REAL ESTATE - Narrative (Details) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2025 USD ($) loanAgreement | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) loanAgreement segment | Jun. 30, 2024 USD ($) | Dec. 31, 2024 loanAgreement
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of portfolio segments | segment |  |  | 2 |  |
Interest income recognized on loans in non-accrual status |  |  | $ 1,000,000 | $ 0 |
Uncollectible accrued interest receivable written off | $ 5,000,000 | $ 0 | $ 5,000,000 | 0 |
Loan-to-value ratio | 75.00% |  | 75.00% |  |
Mortgage loans modified |  |  | $ 89,000,000 | $ 85,000,000 |
Commercial mortgage loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number commercial loans | loanAgreement | 322 |  | 322 |  | 266

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