FAIR VALUE MEASUREMENTS - Changes in Investments Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 2,224	$ 2,029
Net investment gains (losses) included in earnings	(4)	(5)
Unrealized gains (losses) included in other comprehensive income (loss)	57	(30)
Purchases	1,184	761
Issuances	0	0
Sales	(3)	(1)
Settlements	(203)	(227)
Transfers into Level 3	395	709
Transfers out of Level 3	(133)	(1,012)
Balance, end of period	3,517	2,224
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ 2	$ (8)
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]	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]	Net investment gains (losses), Other Comprehensive Income (Loss), before Tax	Net investment gains (losses), 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	$ 1,156	$ 772
Net investment gains (losses) included in earnings	1	3
Unrealized gains (losses) included in other comprehensive income (loss)	24	2
Purchases	909	377
Issuances	0	0
Sales	0	0
Settlements	(153)	(93)
Transfers into Level 3	395	205
Transfers out of Level 3	(38)	(110)
Balance, end of period	2,294	1,156
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	1	2
Fixed maturity securities | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	647	253
Net investment gains (losses) included in earnings	1	1
Unrealized gains (losses) included in other comprehensive income (loss)	29	(19)
Purchases	242	179
Issuances	0	0
Sales	1	0
Settlements	(44)	(33)
Transfers into Level 3	0	499
Transfers out of Level 3	0	(233)
Balance, end of period	876	647
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	1	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	30
Net investment gains (losses) included in earnings	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	0	(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	19	23
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	10	78
Net investment gains (losses) included in earnings	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(1)	(9)
Purchases	0	9
Issuances	0	0
Sales	0	0
Settlements	0	(9)
Transfers into Level 3	0	0
Transfers out of Level 3	0	(59)
Balance, end of period	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
Fixed maturity securities | Other corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	231	648
Net investment gains (losses) included in earnings	(2)	0
Unrealized gains (losses) included in other comprehensive income (loss)	5	(1)
Purchases	24	193
Issuances	0	0
Sales	(2)	0
Settlements	(2)	(4)
Transfers into Level 3	0	5
Transfers out of Level 3	(95)	(610)
Balance, end of period	159	231
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	157	248
Net investment gains (losses) included in earnings	(4)	(9)
Unrealized gains (losses) included in other comprehensive income (loss)	0	0
Purchases	9	3
Issuances	0	0
Sales	(2)	(1)
Settlements	0	(84)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	160	157
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ 0	$ (10)