FAIR VALUE MEASUREMENTS - Changes in Level III Assets (Details) - Level III - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	$ 70,824,615	$ 58,050,471
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	194,293	441,645
Transfers Out	(56,255)	(191,372)
Net Purchases/Issuances/Sales/Settlements	3,908,599	4,337,511
Net Unrealized and Realized Gains (Losses)	(403,262)	767,691
Change in OCI	61,684	(89,239)
Balance, End of Period	74,529,674	63,316,707
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(427,823)	824,636
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	$ 52,148	$ (68,195)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Comprehensive Income (Loss)
Fair Value, Recurring Basis, Unobservable Input Reconciliation Asset, Gain (Loss) Statement Of Income Extensible List Not Disclosed		Net Unrealized and Realized Gains (Losses)
Fair Value Liabilities, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag		Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date
Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	$ 53,096,881	$ 44,793,124
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	17,628	0
Transfers Out	(46,134)	(138,220)
Net Purchases/Issuances/Sales/Settlements	3,743,848	1,270,800
Net Unrealized and Realized Gains (Losses)	(432,153)	802,192
Change in OCI	0	(1,369)
Balance, End of Period	56,380,070	46,726,527
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(443,448)	726,844
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	(1,369)
Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	17,727,734	13,257,347
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	176,665	441,645
Transfers Out	(10,121)	(53,152)
Net Purchases/Issuances/Sales/Settlements	164,751	3,066,711
Net Unrealized and Realized Gains (Losses)	28,891	(34,501)
Change in OCI	61,684	(87,870)
Balance, End of Period	18,149,604	16,590,180
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	15,625	97,792
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	52,148	(66,826)
AFS fixed maturity securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	9,730,098	8,479,061
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	170,775	343,338
Transfers Out	(3,374)	0
Net Purchases/Issuances/Sales/Settlements	88,899	620,339
Net Unrealized and Realized Gains (Losses)	17,126	(2,134)
Change in OCI	61,684	(87,870)
Balance, End of Period	10,065,208	9,352,734
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	52,148	(66,826)
AFS fixed maturity securities | AFS corporate securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	8,310,657	7,650,660
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	(66,084)	391,605
Net Unrealized and Realized Gains (Losses)	21,265	1,275
Change in OCI	28,585	(73,345)
Balance, End of Period	8,294,423	7,970,195
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	19,326	(46,123)
AFS fixed maturity securities | Structured securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	1,419,441	828,401
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	170,775	343,338
Transfers Out	(3,374)	0
Net Purchases/Issuances/Sales/Settlements	154,983	228,734
Net Unrealized and Realized Gains (Losses)	(4,139)	(3,409)
Change in OCI	33,099	(14,525)
Balance, End of Period	1,770,785	1,382,539
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	32,822	(20,703)
Trading Fixed Maturity Securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	1,315,834	983,799
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	5,890	98,307
Transfers Out	(6,747)	(53,152)
Net Purchases/Issuances/Sales/Settlements	(13,876)	326,635
Net Unrealized and Realized Gains (Losses)	(7,666)	(19,325)
Change in OCI	0	0
Balance, End of Period	1,293,435	1,336,264
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(5,781)	(21,528)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Trading Fixed Maturity Securities | AFS corporate securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	672,023	565,025
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	(31,407)
Net Purchases/Issuances/Sales/Settlements	(27,893)	182,432
Net Unrealized and Realized Gains (Losses)	(12,260)	(10,365)
Change in OCI	0	0
Balance, End of Period	631,870	705,685
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(11,841)	(11,116)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Trading Fixed Maturity Securities | Structured securities | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	643,811	418,774
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	5,890	98,307
Transfers Out	(6,747)	(21,745)
Net Purchases/Issuances/Sales/Settlements	14,017	144,203
Net Unrealized and Realized Gains (Losses)	4,594	(8,960)
Change in OCI	0	0
Balance, End of Period	661,565	630,579
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	6,060	(10,412)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Equity securities at fair value | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	16,286	32,937
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	0	0
Net Unrealized and Realized Gains (Losses)	(975)	0
Change in OCI	0	0
Balance, End of Period	15,311	32,937
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(975)	20,292
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Mortgage and other loan receivables | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	787,515	832,674
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	(10,560)	203,197
Net Unrealized and Realized Gains (Losses)	(3,038)	(27,965)
Change in OCI	0	0
Balance, End of Period	773,917	1,007,906
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(2,165)	(9,559)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Other investments | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	4,883,441	1,603,345
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	110,942	1,920,480
Net Unrealized and Realized Gains (Losses)	14,730	96,361
Change in OCI	0	0
Balance, End of Period	5,009,113	3,620,186
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	24,546	108,587
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Income assumed from funds withheld receivable at interest | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	12,785	31,740
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	0	10,435
Net Unrealized and Realized Gains (Losses)	(30,767)	(33,979)
Change in OCI	0	0
Balance, End of Period	(17,982)	8,196
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Reinsurance recoverable | Insurance
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	981,775	1,293,791
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	(10,654)	(14,375)
Net Unrealized and Realized Gains (Losses)	39,481	(47,459)
Change in OCI	0	0
Balance, End of Period	1,010,602	1,231,957
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Private Equity | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	25,336,957	23,322,634
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	(138,220)
Net Purchases/Issuances/Sales/Settlements	933,427	680,792
Net Unrealized and Realized Gains (Losses)	(80,883)	133,810
Change in OCI	0	0
Balance, End of Period	26,189,501	23,999,016
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(82,903)	18,304
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Credit | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	5,786,026	5,826,661
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	17,628	0
Transfers Out	(23,758)	0
Net Purchases/Issuances/Sales/Settlements	76,332	(383,841)
Net Unrealized and Realized Gains (Losses)	46,350	(126,598)
Change in OCI	0	(1,369)
Balance, End of Period	5,902,578	5,314,853
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	44,069	(58,683)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	(1,369)
Real Assets | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	17,015,112	11,389,530
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	2,215,040	1,008,641
Net Unrealized and Realized Gains (Losses)	(283,301)	893,952
Change in OCI	0	0
Balance, End of Period	18,946,851	13,292,123
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(288,639)	864,586
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Equity Method - Other | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	1,624,420	1,013,807
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	5,644	40,182
Net Unrealized and Realized Gains (Losses)	(27,370)	(69,085)
Change in OCI	0	0
Balance, End of Period	1,602,694	984,904
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(23,357)	(71,310)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Other Investments | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	3,334,366	3,240,013
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	(22,376)	0
Net Purchases/Issuances/Sales/Settlements	511,252	(86,258)
Net Unrealized and Realized Gains (Losses)	(84,796)	(18,829)
Change in OCI	0	0
Balance, End of Period	3,738,446	3,134,926
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	(92,618)	(14,995)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	0	0
Other Derivatives | Investments | Asset Management
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance, Beg. of Period	0	479
Transfers In / (Out) - Changes in Consolidation	0	0
Transfers In	0	0
Transfers Out	0	0
Net Purchases/Issuances/Sales/Settlements	2,153	11,284
Net Unrealized and Realized Gains (Losses)	(2,153)	(11,058)
Change in OCI	0	0
Balance, End of Period	0	705
Changes in Net Unrealized Gains (Losses) Included in Earnings related to Level III Assets and Liabilities still held as of the Reporting Date	0	(11,058)
Changes in Net Unrealized Gains (Losses) Included in OCI related to Level III Assets and Liabilities still held as of the Reporting Date	$ 0	$ 0