FAIR VALUE MEASUREMENTS - Breakout of Asset Net Purchases/Issuances/Sales/Settlements (Details) - Level III - USD ($) $ in Thousands	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 [Line Items]
Purchases	$ 4,698,574	$ 5,475,047	$ 9,551,076	$ 12,265,988
Issuances	0	0	0	10,435
Sales	(1,373,071)	(1,505,773)	(1,779,830)	(3,424,881)
Settlements	(305,358)	(836,208)	(842,502)	(1,380,965)
Net Purchases/Issuances/Sales/Settlements	3,020,145	3,133,066	6,928,744	7,470,577
Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	4,315,231	3,955,865	8,604,394	7,105,243
Issuances	0	0	0	0
Sales	(1,363,094)	(1,153,373)	(1,757,041)	(3,014,089)
Settlements	(50,116)	(267,151)	(201,484)	(285,013)
Net Purchases/Issuances/Sales/Settlements	2,902,021	2,535,341	6,645,869	3,806,141
Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	383,343	1,519,182	946,682	5,160,745
Issuances	0	0	0	10,435
Sales	(9,977)	(352,400)	(22,789)	(410,792)
Settlements	(255,242)	(569,057)	(641,018)	(1,095,952)
Net Purchases/Issuances/Sales/Settlements	118,124	597,725	282,875	3,664,436
Investments | Private Equity | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	1,966,888	152,355	2,922,825	1,056,616
Issuances	0	0	0	0
Sales	(3,752)	(154,987)	(26,262)	(378,456)
Settlements	0	0	0	0
Net Purchases/Issuances/Sales/Settlements	1,963,136	(2,632)	2,896,563	678,160
Investments | Credit | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	296,290	254,525	737,023	773,876
Issuances	0	0	0	0
Sales	(824,088)	(162,001)	(1,103,069)	(1,047,331)
Settlements	(14,089)	(267,151)	(99,509)	(285,013)
Net Purchases/Issuances/Sales/Settlements	(541,887)	(174,627)	(465,555)	(558,468)
Investments | Real Assets | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	1,965,000	2,866,531	4,256,691	4,377,318
Issuances	0	0	0	0
Sales	(410,939)	(780,656)	(486,551)	(1,282,802)
Settlements	0	0	(1,039)	0
Net Purchases/Issuances/Sales/Settlements	1,554,061	2,085,875	3,769,101	3,094,516
Investments | Equity Method - Other | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	3,651	570,347	10,123	612,166
Issuances	0	0	0	0
Sales	(795)	(4,388)	(1,623)	(6,025)
Settlements	0	0	0	0
Net Purchases/Issuances/Sales/Settlements	2,856	565,959	8,500	606,141
Investments | Other Investments | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	83,402	67,684	675,579	229,560
Issuances	0	0	0	0
Sales	(123,520)	(51,341)	(139,536)	(299,475)
Settlements	(36,027)	0	(100,936)	0
Net Purchases/Issuances/Sales/Settlements	(76,145)	16,343	435,107	(69,915)
Investments | Other Derivatives | Asset Management
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	0	44,423	2,153	55,707
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net Purchases/Issuances/Sales/Settlements	0	44,423	2,153	55,707
AFS fixed maturity securities | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	303,913	794,393	716,114	1,950,981
Issuances	0	0	0	0
Sales	(5,080)	(70,112)	(5,668)	(128,504)
Settlements	(220,896)	(410,053)	(543,610)	(887,910)
Net Purchases/Issuances/Sales/Settlements	77,937	314,228	166,836	934,567
AFS fixed maturity securities | AFS corporate securities | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	215,605	672,049	450,987	1,596,721
Issuances	0	0	0	0
Sales	(5,080)	(70,112)	(5,668)	(128,504)
Settlements	(162,459)	(244,904)	(463,337)	(719,579)
Net Purchases/Issuances/Sales/Settlements	48,066	357,033	(18,018)	748,638
AFS fixed maturity securities | Structured securities | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	88,308	122,344	265,127	354,260
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(58,437)	(165,149)	(80,273)	(168,331)
Net Purchases/Issuances/Sales/Settlements	29,871	(42,805)	184,854	185,929
Fixed maturity securities, trading, at fair value | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	19,933	70,179	52,300	414,449
Issuances	0	0	0	0
Sales	0	(601)	(1,694)	(601)
Settlements	(17,847)	(79,739)	(62,396)	(97,374)
Net Purchases/Issuances/Sales/Settlements	2,086	(10,161)	(11,790)	316,474
Fixed maturity securities, trading, at fair value | AFS corporate securities | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	7,146	29,638	14,863	218,655
Issuances	0	0	0	0
Sales	0	(601)	(1,000)	(601)
Settlements	(4,037)	(17,042)	(38,647)	(23,627)
Net Purchases/Issuances/Sales/Settlements	3,109	11,995	(24,784)	194,427
Fixed maturity securities, trading, at fair value | Structured securities | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	12,787	40,541	37,437	195,794
Issuances	0	0	0	0
Sales	0	0	(694)	0
Settlements	(13,810)	(62,697)	(23,749)	(73,747)
Net Purchases/Issuances/Sales/Settlements	(1,023)	(22,156)	12,994	122,047
Equity securities at fair value | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net Purchases/Issuances/Sales/Settlements	0	0	0	0
Mortgage and other loan receivables | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	257	13,053	634	233,278
Issuances	0	0	0	0
Sales	0	(7,302)	(3,078)	(7,302)
Settlements	(16,563)	(80,538)	(24,422)	(97,566)
Net Purchases/Issuances/Sales/Settlements	(16,306)	(74,787)	(26,866)	128,410
Other investments | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	59,240	641,557	177,634	2,562,037
Issuances	0	0	0	0
Sales	(4,897)	(274,385)	(12,349)	(274,385)
Settlements	0	0	0	0
Net Purchases/Issuances/Sales/Settlements	54,343	367,172	165,285	2,287,652
Income assumed from funds withheld receivable at interest | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases		0		0
Issuances		0		10,435
Sales		0		0
Settlements		0		0
Net Purchases/Issuances/Sales/Settlements	0	0	0	10,435
Reinsurance recoverable | Insurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	64	1,273	(10,590)	(13,102)
Net Purchases/Issuances/Sales/Settlements	$ 64	$ 1,273	$ (10,590)	$ (13,102)