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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, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | $ 2,029 | $ 1,987
Net investment gains (losses) included in earnings | (4) | 2
Unrealized gains (losses) included in other comprehensive income (loss) | (19) | 45
Purchases | 220 | 277
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (142) | (129)
Transfers into Level 3 | 226 | 18
Transfers out of Level 3 | (233) | (260)
Balance, end of period | 2,077 | 1,940
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ (2) | 3
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment gains (losses) |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), before Tax |
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 | $ 772 | 343
Net investment gains (losses) included in earnings | 1 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (4) | 3
Purchases | 118 | 192
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (28) | (120)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 859 | 418
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 1 | 0
Fixed maturity securities | Public utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 253 | 497
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (10) | 10
Purchases | 60 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (22) | (7)
Transfers into Level 3 | 226 | 18
Transfers out of Level 3 | 0 | (168)
Balance, end of period | 507 | 350
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 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 | 30 | 37
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 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 28 | 37
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 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 | 78 | 159
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (4) | 2
Purchases | 5 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (5) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 74 | 161
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 0 | 0
Fixed maturity securities | Other corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 648 | 742
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 1 | 30
Purchases | 37 | 75
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (3) | (2)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (233) | (92)
Balance, end of period | 450 | 753
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 0 | 0
Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 248 | 209
Net investment gains (losses) included in earnings | (5) | 2
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases | 0 | 10
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (84) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 159 | 221
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ (3) | $ 3

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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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