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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, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | $ 1,987 | $ 1,471
Net investment gains (losses) included in earnings | 35 | 5
Unrealized gains (losses) included in other comprehensive income (loss) | 23 | (288)
Purchases | 669 | 886
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (186) | (359)
Transfers into Level 3 | 215 | 496
Transfers out of Level 3 | (714) | (224)
Balance, end of period | 2,029 | 1,987
Change in unrealized gains (losses) still held | $ 40 | $ (2)
Change in unrealized gains (losses) still held ext list | Net investment gains (losses) | Net investment gains (losses)
Net investment gains (losses) included in earnings ext list | Net investment gains (losses) | Net investment gains (losses)
Unrealized gains (losses) included in other comprehensive income (loss) ext list | Total other comprehensive income (loss) before income taxes | 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 | $ 343 | $ 291
Net investment gains (losses) included in earnings | 0 | (4)
Unrealized gains (losses) included in other comprehensive income (loss) | 1 | (76)
Purchases | 430 | 273
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (154) | (78)
Transfers into Level 3 | 155 | 0
Transfers out of Level 3 | (3) | (63)
Balance, end of period | 772 | 343
Change in unrealized gains (losses) still held | 0 | (4)
Fixed maturity securities | Public utilities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 497 | 493
Net investment gains (losses) included in earnings | 0 | 4
Unrealized gains (losses) included in other comprehensive income (loss) | (2) | (99)
Purchases | 46 | 35
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (17) | (64)
Transfers into Level 3 | 18 | 128
Transfers out of Level 3 | (289) | 0
Balance, end of period | 253 | 497
Change in unrealized gains (losses) still held | 0 | 1
Fixed maturity securities | Sovereign and supranational |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 37 | 43
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | (3) | (6)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (4) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance, end of period | 30 | 37
Change in unrealized gains (losses) still held | 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 | 159 | 45
Net investment gains (losses) included in earnings | 0 | 1
Unrealized gains (losses) included in other comprehensive income (loss) | 10 | (14)
Purchases | 0 | 132
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (7) | (23)
Transfers into Level 3 | 3 | 18
Transfers out of Level 3 | (87) | 0
Balance, end of period | 78 | 159
Change in unrealized gains (losses) still held | 0 | 0
Fixed maturity securities | Other corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 742 | 426
Net investment gains (losses) included in earnings | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) | 17 | (93)
Purchases | 183 | 387
Issuances | 0 | 0
Sales | 0 | 0
Settlements | (4) | (187)
Transfers into Level 3 | 39 | 350
Transfers out of Level 3 | (329) | (141)
Balance, end of period | 648 | 742
Change in unrealized gains (losses) still held | 0 | 0
Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, beginning of period | 209 | 173
Net investment gains (losses) included in earnings | 35 | 4
Unrealized gains (losses) included in other comprehensive income (loss) | 0 | 0
Purchases | 10 | 59
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | (7)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (6) | (20)
Balance, end of period | 248 | 209
Change in unrealized gains (losses) still held | $ 40 | $ 1

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