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INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |
Balance, beginning of period | $ (274) |
(Addition to) release of allowance for credit losses | (7) | $ (31)
Balance, end of period | (232) |
Balance, beginning of period | (5) | (7)
(Addition to) release of allowance for credit losses | 0 | 1
Write-offs, net of recoveries | 0 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | (5) | (6)
Balance, beginning of period | 0 | 0
(Addition to) release of allowance for credit losses | 0 | 0
Write-offs, net of recoveries | 0 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | 0 | 0
Balance, beginning of period | (295) | (223)
(Addition to) release of allowance for credit losses | (7) | (27)
Write-offs, net of recoveries | 50 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | (252) | (250)
Transitional real estate loans |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |
Balance, beginning of period | (112) | (54)
(Addition to) release of allowance for credit losses | (2) | (11)
Write-offs, net of recoveries | 0 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | (114) | (65)
Commercial mortgage loans |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |
Balance, beginning of period | (16) | (9)
(Addition to) release of allowance for credit losses | (3) | 0
Write-offs, net of recoveries | 0 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | (19) | (9)
Middle market loans |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |
Balance, beginning of period | (146) | (129)
(Addition to) release of allowance for credit losses | (3) | (20)
Write-offs, net of recoveries | 50 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | (99) | (149)
Other loans and loan commitments |  |
Allowance for Loan Losses by Portfolio Segment [Roll Forward] |  |
Balance, beginning of period | (16) | (24)
(Addition to) release of allowance for credit losses | 1 | 3
Write-offs, net of recoveries | 0 | 0
Change in foreign exchange | 0 | 0
Balance, end of period | $ (15) | $ (21)

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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