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