OTHER ASSETS AND ACCRUED EXPENSES AND OTHER LIABILITIES - Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Securities Sold Under Agreements to Repurchase	$ 588,407	$ 1,413,068
Total Accrued Expenses and Other Liabilities	12,669,270	10,974,421
Asset Management and Strategic Holdings
Lessee, Lease, Description [Line Items]
Amounts Payable to Carry Pool	3,988,966	2,664,694
Unsettled Investment Purchases and Derivative Collateral Liabilities	1,128,579	574,986
Securities Sold Short	134,297	149,136
Derivative Liabilities	70	2,382
Accrued Compensation and Benefits	276,304	210,625
Interest Payable	496,491	492,501
Foreign Exchange Contracts and Options	226,240	441,608
Accounts Payable and Accrued Expenses	434,886	221,851
Taxes Payable	55,524	39,255
Uncertain Tax Positions	25,063	23,579
Unfunded Revolver Commitments	$ 98,327	$ 94,683
Operating lease, liability, statement of financial position	Total Accrued Expenses and Other Liabilities	Total Accrued Expenses and Other Liabilities
Operating Lease Liabilities	$ 333,904	$ 360,852
Deferred Tax Liabilities, net	2,568,268	2,370,118
Other Liabilities	102,099	72,145
Total Accrued Expenses and Other Liabilities	$ 9,869,018	$ 7,718,415
Operating lease, weighted average remaining lease term	10 years 2 months 12 days	10 years 3 months 18 days
Operating lease, weighted average discount rate	2.90%	2.90%
Asset Management and Strategic Holdings | Minimum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	1 year
Operating lease, maximum extension term	5 years
Asset Management and Strategic Holdings | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	17 years
Operating lease, maximum extension term	10 years
Insurance
Lessee, Lease, Description [Line Items]
Unsettled Investment Purchases and Derivative Collateral Liabilities	$ 648,859	$ 205,669
Derivative Liabilities	304,162	146,197
Interest Payable	$ 33,126	$ 15,894
Operating lease, liability, statement of financial position	Total Accrued Expenses and Other Liabilities	Total Accrued Expenses and Other Liabilities
Operating Lease Liabilities	$ 190,359	$ 193,566
Securities Sold Under Agreements to Repurchase	566,169	1,358,434
Accrued Expenses	620,949	607,262
Insurance Operations Balances in Course of Settlement	278,095	250,367
Accrued Employee Related Expenses	67,179	370,984
Tax Payable to Former Parent Company	48,386	62,545
Accounts and Commissions Payable	28,978	32,104
Other Tax Related Liabilities	13,990	12,984
Total Accrued Expenses and Other Liabilities	$ 2,800,252	$ 3,256,006
Operating lease, weighted average remaining lease term	7 years 7 months 6 days	7 years 7 months 6 days
Operating lease, weighted average discount rate	4.70%	4.40%
Operating lease, optional extension period	10 years
Insurance | Land
Lessee, Lease, Description [Line Items]
Operating lease, weighted average remaining lease term	42 years 9 months 18 days	43 years 8 months 12 days
Insurance | Minimum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	1 year
Insurance | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	11 years