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INVESTMENTS - Loan Performance After Modifications (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months, nonaccrual | $ 61 | $ 0
Current |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 632 | 414
Less Than 90 Days Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 11 | 0
90 Days or More Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 61 | 0
Transitional real estate loans |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months, nonaccrual | 61 | 0
Transitional real estate loans | Current |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 501 | 414
Transitional real estate loans | Less Than 90 Days Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 0 | 0
Transitional real estate loans | 90 Days or More Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 61 | $ 0
Middle market loans |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months, nonaccrual | 0 |
Middle market loans | Current |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 131 |
Middle market loans | Less Than 90 Days Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | 11 |
Middle market loans | 90 Days or More Past Due |  |
Financing Receivable, Modified, Past Due [Line Items] |  |
Loan modification, after 12 months | $ 0 |

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- Definition Amortized cost of financing receivable 12 months after modification for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
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