DEBT OBLIGATIONS - Carrying Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Roll Forward]
Beginning balance	$ 21,356,679	$ 29,237,694
Ending balance	23,458,626	21,356,679
Excess MSRs
Debt Instrument [Roll Forward]
Beginning balance	2,907,300	2,949,526
Ending balance	2,713,933	2,907,300
MSRs
Debt Instrument [Roll Forward]
Beginning balance	4,791,543	4,234,771
Ending balance	4,800,728	4,791,543
Commercial Notes Receivable
Debt Instrument [Roll Forward]
Beginning balance	0	0
Ending balance	317,096	0
Real Estate and Other Securities
Debt Instrument [Roll Forward]
Beginning balance	7,431,070	9,043,412
Ending balance	8,762,658	7,431,070
Residential mortgage loans, mortgage loans receivable, SFR, and commercial notes receivable
Debt Instrument [Roll Forward]
Beginning balance	3,371,315	10,940,823
Ending balance	2,590,038	3,371,315
Consumer Loans
Debt Instrument [Roll Forward]
Beginning balance	299,498	458,580
Ending balance	1,106,974	299,498
SFR Properties
Debt Instrument [Roll Forward]
Beginning balance	822,372	357,922
Ending balance	809,708	822,372
Mortgage Loans Receivable
Debt Instrument [Roll Forward]
Beginning balance	1,733,581	1,252,660
Ending balance	1,856,008	1,733,581
Asset Management
Debt Instrument [Roll Forward]
Beginning balance	0	0
Ending balance	501,483	0
Secured Financing Agreements
Debt Instrument [Roll Forward]
Beginning balance	11,257,736
Acquired borrowings, net of discount	177,551
Borrowings	91,141,391	130,455,309
Repayments	(90,017,916)	(139,791,583)
FX remeasurement	7,114
Capitalized deferred financing costs, net of amortization	(4,592)	1,128
Ending balance	12,561,283	11,257,736
Secured Financing Agreements | Excess MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	0
Repayments	0	0
FX remeasurement	0
Capitalized deferred financing costs, net of amortization		0
Secured Financing Agreements | MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	0
Repayments	0	0
FX remeasurement	0
Capitalized deferred financing costs, net of amortization		0
Secured Financing Agreements | Commercial Notes Receivable
Debt Instrument [Roll Forward]
Beginning balance	0
Acquired borrowings, net of discount	0
Borrowings	323,452	0
Repayments	0	0
FX remeasurement
Capitalized deferred financing costs, net of amortization	(6,356)	0
Ending balance	317,096	0
Secured Financing Agreements | Real Estate and Other Securities
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	50,253,463	54,385,892
Repayments	(48,921,875)	(55,998,234)
FX remeasurement
Capitalized deferred financing costs, net of amortization		0
Secured Financing Agreements | Residential mortgage loans, mortgage loans receivable, SFR, and commercial notes receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	37,971,788	73,782,327
Repayments	(38,634,841)	(81,320,424)
FX remeasurement	0
Capitalized deferred financing costs, net of amortization	1,764	1,128
Secured Financing Agreements | Consumer Loans
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	0
Repayments	0	0
FX remeasurement	0
Capitalized deferred financing costs, net of amortization		0
Secured Financing Agreements | SFR Properties
Debt Instrument [Roll Forward]
Beginning balance	4,677
Acquired borrowings, net of discount	0
Borrowings	20,534	206,595
Repayments	(4,677)	(360,433)
FX remeasurement	0
Capitalized deferred financing costs, net of amortization		0
Ending balance	20,534	4,677
Secured Financing Agreements | Mortgage Loans Receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	2,572,154	2,080,495
Repayments	(2,455,805)	(2,112,492)
FX remeasurement	0
Capitalized deferred financing costs, net of amortization		0
Secured Financing Agreements | Asset Management
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	177,551
Borrowings	0	0
Repayments	(718)	0
FX remeasurement	7,114
Capitalized deferred financing costs, net of amortization		0
Secured Notes and Bonds Payable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	99,232
Borrowings	8,099,962	6,236,323
Repayments	(7,636,954)	(4,696,138)
FX remeasurement	(1,008)
Discount on borrowings, net of amortization		(42,030)
Unrealized (gain) loss on notes, fair value	11,638	(45,791)
Capitalized deferred financing costs, net of amortization	7,372	1,767
Secured Notes and Bonds Payable | Excess MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	2,757,587	2,804,677
Repayments	(2,954,228)	(2,849,496)
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	0	0
Capitalized deferred financing costs, net of amortization	3,274	2,593
Secured Notes and Bonds Payable | MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	4,156,358	2,027,637
Repayments	(4,148,588)	(1,473,037)
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	0	0
Capitalized deferred financing costs, net of amortization	1,415	2,172
Secured Notes and Bonds Payable | Commercial Notes Receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount
Borrowings		0
Repayments		0
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value		0
Capitalized deferred financing costs, net of amortization		0
Secured Notes and Bonds Payable | Real Estate and Other Securities
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount
Borrowings	0	0
Repayments	0	0
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	0	0
Capitalized deferred financing costs, net of amortization	0	0
Secured Notes and Bonds Payable | Residential mortgage loans, mortgage loans receivable, SFR, and commercial notes receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	0
Repayments	(116,730)	(33,204)
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	(3,258)	665
Capitalized deferred financing costs, net of amortization	0	0
Secured Notes and Bonds Payable | Consumer Loans
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	1,185,612	0
Repayments	(381,718)	(123,770)
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	8,818	(35,312)
Capitalized deferred financing costs, net of amortization	(5,236)	0
Secured Notes and Bonds Payable | SFR Properties
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	879,947
Repayments	(35,690)	(216,631)
FX remeasurement	0
Discount on borrowings, net of amortization		(42,030)
Unrealized (gain) loss on notes, fair value	0	0
Capitalized deferred financing costs, net of amortization	7,169	(2,998)
Secured Notes and Bonds Payable | Mortgage Loans Receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Borrowings	0	524,062
Repayments	0	0
FX remeasurement	0
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	6,078	(11,144)
Capitalized deferred financing costs, net of amortization	0	0
Secured Notes and Bonds Payable | Asset Management
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	99,232
Borrowings	405	0
Repayments	0	0
FX remeasurement	(1,008)
Discount on borrowings, net of amortization		0
Unrealized (gain) loss on notes, fair value	0	0
Capitalized deferred financing costs, net of amortization	750	$ 0
Liabilities of Consolidated Funds
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	218,746
Unrealized (gain) loss on notes, fair value	(589)
Liabilities of Consolidated Funds | Excess MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | MSRs
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Commercial Notes Receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Real Estate and Other Securities
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Residential mortgage loans, mortgage loans receivable, SFR, and commercial notes receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Consumer Loans
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | SFR Properties
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Mortgage Loans Receivable
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	0
Unrealized (gain) loss on notes, fair value	0
Liabilities of Consolidated Funds | Asset Management
Debt Instrument [Roll Forward]
Acquired borrowings, net of discount	218,746
Unrealized (gain) loss on notes, fair value	$ (589)