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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, 2025 | Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | $ 2,224 | $ 2,029
Net investment gains (losses) included in earnings | 1 | (4)
Unrealized gains (losses) included in other comprehensive income (loss) | 19 | (19)
Purchases | 547 | 220
Issuances | 0 | 0
Sales | (1) | 0
Settlements | (20) | (142)
Transfers into Level 3 | 15 | 226
Transfers out of Level 3 | (95) | (233)
Balance, end of period | 2,690 | 2,077
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ 1 | $ (2)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment gains (losses) | 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 | Other Comprehensive Income (Loss), before Tax
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment gains (losses), Other Comprehensive Income (Loss), before Tax | Net investment gains (losses), 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 | $ 1,156 | $ 772
Net investment gains (losses) included in earnings | 0 | 1
Unrealized gains (losses) included in other comprehensive income (loss) | 10 | (4)
Purchases | 434 | 118
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (12) | (28)
Transfers into Level 3 | 15 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 1,603 | 859
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 0 | 1
Fixed maturity securities | Public utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 647 | 253
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 6 | (10)
Purchases | 110 | 60
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (7) | (22)
Transfers into Level 3 | 0 | 226
Transfers out of Level 3 | 0 | 0
Balance, end of period | 756 | 507
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 | 23 | 30
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 1 | (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 | 24 | 28
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 | 10 | 78
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | (4)
Purchases | 0 | 5
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | (5)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 10 | 74
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 | 231 | 648
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 2 | 1
Purchases | 0 | 37
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (1) | (3)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (95) | (233)
Balance, end of period | 137 | 450
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 | 157 | 248
Net investment gains (losses) included in earnings | 1 | (5)
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases | 3 | 0
Issuances | 0 | 0
Sales | (1) | 0
Settlements | 0 | (84)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 160 | 159
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ 1 | $ (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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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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