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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | $ 3,076 | $ 2,213 | $ 2,224 | $ 2,029
Net investment gains (losses) included in earnings | (4) | 3 | 0 | (2)
Unrealized gains (losses) included in other comprehensive income (loss) | 14 | 99 | 69 | 63
Purchases | 218 | 184 | 1,016 | 690
Issuances | 0 | 0 | 0 | 0
Sales | (1) | (1) | (2) | (1)
Settlements | (69) | (24) | (161) | (192)
Transfers into Level 3 | 175 | 159 | 358 | 631
Transfers out of Level 3 | 0 | (281) | (95) | (866)
Balance, end of period | 3,409 | 2,352 | 3,409 | 2,352
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings | $ 0 | $ 7 | $ 4 | $ 3
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 | $ 1,922 | $ 1,213 | $ 1,156 | $ 772
Net investment gains (losses) included in earnings | 0 | 1 | 0 | 3
Unrealized gains (losses) included in other comprehensive income (loss) | 6 | 57 | 36 | 48
Purchases | 208 | 31 | 817 | 338
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (65) | (18) | (121) | (67)
Transfers into Level 3 | 175 | 15 | 358 | 205
Transfers out of Level 3 | 0 | (90) | 0 | (90)
Balance, end of period | 2,246 | 1,209 | 2,246 | 1,209
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 | 3
Fixed maturity securities | Public utilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period | 792 | 365 | 647 | 253
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 9 | 19 | 29 | 8
Purchases | 9 | 48 | 167 | 147
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (4) | (1) | (37) | (26)
Transfers into Level 3 | 0 | 139 | 0 | 421
Transfers out of Level 3 | 0 | 0 | 0 | (233)
Balance, end of period | 806 | 570 | 806 | 570
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 | 23 | 25 | 23 | 30
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (1) | 3 | 1 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (2) | (2)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance, end of period | 22 | 28 | 22 | 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 | 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 | 9 | 69 | 10 | 78
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | (1) | (9)
Purchases | 0 | 4 | 0 | 9
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | (4) | 0 | (9)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (59) | 0 | (59)
Balance, end of period | 9 | 10 | 9 | 10
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 | 163 | 384 | 231 | 648
Net investment gains (losses) included in earnings | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 20 | 4 | 16
Purchases | 0 | 98 | 24 | 193
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | (1) | (1) | (4)
Transfers into Level 3 | 0 | 5 | 0 | 5
Transfers out of Level 3 | 0 | (132) | (95) | (484)
Balance, end of period | 163 | 374 | 163 | 374
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 | 167 | 157 | 157 | 248
Net investment gains (losses) included in earnings | (4) | 2 | 0 | (5)
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0 | 0 | 0
Purchases | 1 | 3 | 8 | 3
Issuances | 0 | 0 | 0 | 0
Sales | (1) | (1) | (2) | (1)
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 | 163 | 161 | 163 | 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 | $ 6 | $ 4 | $ 0

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