FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 2,213	$ 1,840	$ 2,029	$ 1,987
Net investment gains (losses) included in earnings	3	(7)	(2)	(13)
Unrealized gains (losses) included in other comprehensive income (loss)	99	(69)	63	(76)
Purchases	184	127	690	577
Issuances	0	0	0	0
Sales	(1)	0	(1)	0
Settlements	(24)	(17)	(192)	(171)
Transfers into Level 3	159	42	631	184
Transfers out of Level 3	(281)	(109)	(866)	(681)
Balance, end of period	2,352	1,807	2,352	1,807
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ 7	$ (3)	$ 3	$ (7)
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
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	$ 1,213	$ 652	$ 772	$ 343
Net investment gains (losses) included in earnings	1	0	3	0
Unrealized gains (losses) included in other comprehensive income (loss)	57	(13)	48	(23)
Purchases	31	55	338	383
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(18)	(11)	(67)	(144)
Transfers into Level 3	15	0	205	124
Transfers out of Level 3	(90)	(3)	(90)	(3)
Balance, end of period	1,209	680	1,209	680
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	3	1
Fixed maturity securities | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	365	302	253	497
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	19	(12)	8	(18)
Purchases	48	36	147	36
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(6)	(26)	(15)
Transfers into Level 3	139	0	421	18
Transfers out of Level 3	0	(61)	(233)	(259)
Balance, end of period	570	259	570	259
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	1
Fixed maturity securities | Sovereign and supranational
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	25	32	30	37
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	3	(1)	0	(4)
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	28	31	28	31
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	69	69	78	159
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	0	(2)	(9)	2
Purchases	4	0	9	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(4)	0	(9)	(7)
Transfers into Level 3	0	3	0	3
Transfers out of Level 3	(59)	0	(59)	(87)
Balance, end of period	10	70	10	70
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	384	572	648	742
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	20	(41)	16	(33)
Purchases	98	36	193	148
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	0	(4)	(3)
Transfers into Level 3	5	39	5	39
Transfers out of Level 3	(132)	(42)	(484)	(329)
Balance, end of period	374	564	374	564
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	157	213	248	209
Net investment gains (losses) included in earnings	2	(7)	(5)	(13)
Unrealized gains (losses) included in other comprehensive income (loss)	0	0	0	0
Purchases	3	0	3	10
Issuances	0	0	0	0
Sales	(1)	0	(1)	0
Settlements	0	0	(84)	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(3)	0	(3)
Balance, end of period	161	203	161	203
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ 6	$ (3)	$ 0	$ (9)