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FAIR VALUE MEASUREMENTS - Changes in Investments Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | $ 2,690 | $ 2,077 | $ 2,224 | $ 2,029
Net investment gains (losses) included in earnings | 3 | (1) | 4 | (5)
Unrealized gains (losses) included in other comprehensive income (loss) | 36 | (17) | 55 | (36)
Purchases | 251 | 286 | 798 | 506
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (1) | 0
Settlements | (72) | (26) | (92) | (168)
Transfers into Level 3 | 168 | 246 | 183 | 472
Transfers out of Level 3 | 0 | (352) | (95) | (585)
Balance, end of period | 3,076 | 2,213 | 3,076 | 2,213
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ 3 | $ (2) | $ 4 | $ (4)
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) | 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 | 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] | Other Comprehensive Income (Loss), before Tax | Other Comprehensive Income (Loss), before Tax | Other Comprehensive Income (Loss), before Tax | 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 | $ 1,603 | $ 859 | $ 1,156 | $ 772
Net investment gains (losses) included in earnings | 0 | 1 | 0 | 2
Unrealized gains (losses) included in other comprehensive income (loss) | 20 | (5) | 30 | (9)
Purchases | 175 | 189 | 609 | 307
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (44) | (21) | (56) | (49)
Transfers into Level 3 | 168 | 190 | 183 | 190
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 1,922 | 1,213 | 1,922 | 1,213
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 | 0 | 2
Fixed maturity securities | Public utilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 756 | 507 | 647 | 253
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 14 | (1) | 20 | (11)
Purchases | 48 | 39 | 158 | 99
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (26) | (3) | (33) | (25)
Transfers into Level 3 | 0 | 56 | 0 | 282
Transfers out of Level 3 | 0 | (233) | 0 | (233)
Balance, end of period | 792 | 365 | 792 | 365
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 | 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 | 24 | 28 | 23 | 30
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 1 | (1) | 2 | (3)
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (2) | (2) | (2) | (2)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 23 | 25 | 23 | 25
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 | 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 | 74 | 10 | 78
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (1) | (5) | (1) | (9)
Purchases | 0 | 0 | 0 | 5
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | (5)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 9 | 69 | 9 | 69
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 | 0 | 0
Fixed maturity securities | Other corporate |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 137 | 450 | 231 | 648
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 2 | (5) | 4 | (4)
Purchases | 24 | 58 | 24 | 95
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1) | (3)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (119) | (95) | (352)
Balance, end of period | 163 | 384 | 163 | 384
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 | 0 | 0
Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 160 | 159 | 157 | 248
Net investment gains (losses) included in earnings | 3 | (2) | 4 | (7)
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases | 4 | 0 | 7 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | (1) | 0
Settlements | 0 | 0 | 0 | (84)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 167 | 157 | 167 | 157
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) | $ 4 | $ (6)

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