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MORTGAGE LOANS ON REAL ESTATE - Narrative (Details) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2024 USD ($) loanAgreement | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment loanAgreement | Jun. 30, 2023 USD ($) | Dec. 31, 2023 loanAgreement
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number of operating segments | segment |  |  | 3 |  |
Number of portfolio segments | segment |  |  | 2 |  |
Interest income recognized on loans in non-accrual status | $ |  |  | $ 1,000,000 | $ 0 |
Loan-to-value ratio | 75.00% |  | 75.00% |  |
Mortgage loans modified | $ | $ 85,000,000 | $ 86,000,000 |  |  |
Commercial mortgage loans: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Number commercial loans | loanAgreement | 195 |  | 195 |  | 3

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