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FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | $ 1,987 | $ 1,471
Net investment gains (losses) included in earnings | 2 | 7
Unrealized gains (losses) included in other comprehensive income (loss) | 45 | (72)
Purchases | 277 | 95
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (129) | (21)
Transfers into Level 3 | 18 | 170
Transfers out of Level 3 | (260) | (190)
Balance, end of period | 1,940 | 1,460
Change in unrealized gains (losses) still held | 3 | 4
Fixed maturity securities | Mortgage- and asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 343 | 291
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 3 | (15)
Purchases | 192 | 76
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (120) | (2)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (32)
Balance, end of period | 418 | 318
Change in unrealized gains (losses) still held | 0 | 0
Fixed maturity securities | Public utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 497 | 493
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 10 | (37)
Purchases | 0 | 9
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (7) | (8)
Transfers into Level 3 | 18 | 128
Transfers out of Level 3 | (168) | 0
Balance, end of period | 350 | 585
Change in unrealized gains (losses) still held | 0 | 0
Fixed maturity securities | Sovereign and supranational |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 37 | 43
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | (2)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 37 | 41
Change in unrealized gains (losses) still held | 0 | 0
Fixed maturity securities | Banks/financial institutions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 159 | 45
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 2 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | (3)
Transfers into Level 3 | 0 | 18
Transfers out of Level 3 | 0 | 0
Balance, end of period | 161 | 60
Change in unrealized gains (losses) still held | 0 | 0
Fixed maturity securities | Other corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 742 | 426
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 30 | (18)
Purchases | 75 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (2) | (1)
Transfers into Level 3 | 0 | 24
Transfers out of Level 3 | (92) | (141)
Balance, end of period | 753 | 290
Change in unrealized gains (losses) still held | 0 | 0
Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 209 | 173
Net investment gains (losses) included in earnings | 2 | 7
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases | 10 | 10
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | (7)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (17)
Balance, end of period | 221 | 166
Change in unrealized gains (losses) still held | $ 3 | $ 4

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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