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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,940	$ 1,460	$ 1,987	$ 1,471
Net investment gains (losses) included in earnings	(8)	(5)	(6)	2
Unrealized gains (losses) included in other comprehensive income (loss)	(52)	(142)	(7)	(214)
Purchases	173	297	450	392
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(25)	(61)	(154)	(82)
Transfers into Level 3	124	258	142	428
Transfers out of Level 3	(312)	(10)	(572)	(200)
Balance, end of period	1,840	1,797	1,840	1,797
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	(8)	(6)	(5)	(1)
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	418	318	343	291
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(13)	(54)	(10)	(69)
Purchases	136	90	328	166
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(13)	(36)	(133)	(38)
Transfers into Level 3	124	0	124	0
Transfers out of Level 3	0	(7)	0	(39)
Balance, end of period	652	311	652	311
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 | Public utilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	350	585	497	493
Net investment gains (losses) included in earnings	0	1	0	1
Unrealized gains (losses) included in other comprehensive income (loss)	(16)	(44)	(6)	(81)
Purchases	0	19	0	28
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(2)	(24)	(9)	(32)
Transfers into Level 3	0	0	18	128
Transfers out of Level 3	(30)	0	(198)	0
Balance, end of period	302	537	302	537
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	37	41	37	43
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(3)	(5)	(3)	(7)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(2)	0	(2)	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	32	36	32	36
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	161	60	159	45
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	2	(2)	4	(2)
Purchases	0	33	0	33
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(7)	0	(7)	(3)
Transfers into Level 3	0	0	0	18
Transfers out of Level 3	(87)	0	(87)	0
Balance, end of period	69	91	69	91
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	753	290	742	426
Net investment gains (losses) included in earnings	0	0	0	0
Unrealized gains (losses) included in other comprehensive income (loss)	(22)	(37)	8	(55)
Purchases	37	122	112	122
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(1)	(3)	(2)
Transfers into Level 3	0	258	0	282
Transfers out of Level 3	(195)	0	(287)	(141)
Balance, end of period	572	632	572	632
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	221	166	209	173
Net investment gains (losses) included in earnings	(8)	(6)	(6)	1
Unrealized gains (losses) included in other comprehensive income (loss)	0	0	0	0
Purchases	0	33	10	43
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	(7)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(3)	0	(20)
Balance, end of period	213	190	213	190
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings	$ (8)	$ (6)	$ (5)	$ (2)