FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 2,077	$ 1,940	$ 2,029	$ 1,987
Net investment gains (losses) included in earnings	(1)	(8)	(5)	(6)
Unrealized gains (losses) included in other comprehensive income (loss)	(17)	(52)	(36)	(7)
Purchases	286	173	506	450
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(26)	(25)	(168)	(154)
Transfers into Level 3	246	124	472	142
Transfers out of Level 3	(352)	(312)	(585)	(572)
Balance, end of period	2,213	1,840	2,213	1,840
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)	$ (4)	$ (5)
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	$ 859	$ 418	$ 772	$ 343
Net investment gains (losses) included in earnings	1	0	2	0
Unrealized gains (losses) included in other comprehensive income (loss)	(5)	(13)	(9)	(10)
Purchases	189	136	307	328
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(21)	(13)	(49)	(133)
Transfers into Level 3	190	124	190	124
Transfers out of Level 3	0	0	0	0
Balance, end of period	1,213	652	1,213	652
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	2	0
Fixed maturity securities | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	507	350	253	497
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(1)	(16)	(11)	(6)
Purchases	39	0	99	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(3)	(2)	(25)	(9)
Transfers into Level 3	56	0	282	18
Transfers out of Level 3	(233)	(30)	(233)	(198)
Balance, end of period	365	302	365	302
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	28	37	30	37
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(1)	(3)	(3)	(3)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(2)	(2)	(2)	(2)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	25	32	25	32
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	74	161	78	159
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(5)	2	(9)	4
Purchases	0	0	5	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	(7)	(5)	(7)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(87)	0	(87)
Balance, end of period	69	69	69	69
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	450	753	648	742
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(5)	(22)	(4)	8
Purchases	58	37	95	112
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	(1)	(3)	(3)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(119)	(195)	(352)	(287)
Balance, end of period	384	572	384	572
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	159	221	248	209
Net investment gains (losses) included in earnings	(2)	(8)	(7)	(6)
Unrealized gains (losses) included in other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	10
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(84)	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	157	213	157	213
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ (3)	$ (8)	$ (6)	$ (5)