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INVESTMENTS - Summary of Gross Gains (Losses) from Sales of Fixed Maturity and Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Proceeds from sales of fixed maturity securities - available for sale | $ 300 | $ 405 | $ 468 | $ 1,177
Gross gains from dispositions | 4 | 5 | 21 | 33
Gross losses from dispositions | (23) | (58) | (42) | (98)
Proceeds from sales of equity securities |  |  | 126 | 1,030
Equity securities |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Proceeds from sales of equity securities | 80 | 592 | 126 | 1,030
Gross gains from dispositions | 2 | 60 | 8 | 67
Gross losses from dispositions | $ 0 | $ (2) | $ 0 | $ (53)

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- Definition Amount of realized gain 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 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized 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 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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