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INVESTMENTS - Summary of Components of Net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |
Net realized gains (losses) from dispositions | $ 8 | $ (5)
Gains (losses) from fair value adjustments | 4 | (137)
Total net gains (losses) on investments | 5 | (154)
Fixed maturities | Market Value |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Allowance for credit losses | (8) | (12)
Net realized gains (losses) from dispositions | 2 | 3
Equity securities | Fair Value |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Net realized gains (losses) from dispositions | 7 | (12)
Gains (losses) from fair value adjustments | 4 | (137)
Other invested assets |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Net realized gains (losses) from dispositions | $ 0 | $ 4

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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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