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FAIR VALUE MEASUREMENTS - Changes in Investments Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 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 | (5) | 35
Unrealized gains (losses) included in other comprehensive income (loss) | (30) | 23
Purchases | 761 | 669
Issuances | 0 | 0
Sales | (1) | 0
Settlements | (227) | (186)
Transfers into Level 3 | 709 | 215
Transfers out of Level 3 | (1,012) | (714)
Balance, end of period | 2,224 | 2,029
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ (8) | $ 40
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] | Total other comprehensive income (loss) before income taxes | Total other comprehensive income (loss) before income taxes
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment gains (losses), Total other comprehensive income (loss) before income taxes | Net investment gains (losses), Total other comprehensive income (loss) before income taxes
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 | 3 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 2 | 1
Purchases | 377 | 430
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (93) | (154)
Transfers into Level 3 | 205 | 155
Transfers out of Level 3 | (110) | (3)
Balance, end of period | 1,156 | 772
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | 2 | 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 | 1 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (19) | (2)
Purchases | 179 | 46
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (33) | (17)
Transfers into Level 3 | 499 | 18
Transfers out of Level 3 | (233) | (289)
Balance, end of period | 647 | 253
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) | (3) | (3)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (4) | (4)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 23 | 30
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) | (9) | 10
Purchases | 9 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (9) | (7)
Transfers into Level 3 | 0 | 3
Transfers out of Level 3 | (59) | (87)
Balance, end of period | 10 | 78
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) | 17
Purchases | 193 | 183
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (4) | (4)
Transfers into Level 3 | 5 | 39
Transfers out of Level 3 | (610) | (329)
Balance, end of period | 231 | 648
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 | (9) | 35
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases | 3 | 10
Issuances | 0 | 0
Sales | (1) | 0
Settlements | (84) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (6)
Balance, end of period | 157 | 248
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ (10) | $ 40

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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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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + 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/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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