Secured Borrowings - Secured Financing Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Secured Borrowings
Pledged Asset Carrying Value	$ 100,319	$ 102,368
Secured financing agreements, net	12,556,487	13,867,996
Revolving Credit Facility
Secured Borrowings
Maximum borrowing capacity	150,000
Equity interests in certain subsidiaries used to secure facilities	5,900,000
Borrowing Base Facility
Secured Borrowings
Maximum Facility Size	450,000
Maximum facility size subject to certain conditions	750,000
Commercial Financing Facilities
Secured Borrowings
Maximum Facility Size	471,000
Term Loan Facility
Secured Borrowings
Maximum borrowing capacity	770,800
Term Loan Facility Maturing November 2027
Secured Borrowings
Maximum borrowing capacity	$ 592,500
Floor interest rate (as a percent)	0.50%
SOFR | Revolving Credit Facility
Secured Borrowings
Coupon Rate	2.60%
SOFR | Term Loan Facility
Secured Borrowings
Floor interest rate (as a percent)	0.75%
SOFR | Term Loan Facility Maturing November 2027
Secured Borrowings
Pricing margin (as a percent)	3.25%
SOFR + 2.60% | Term Loan Facility
Secured Borrowings
Pricing margin (as a percent)	2.60%
Maximum borrowing capacity	$ 382,000
SOFR + 3.35% | Term Loan Facility
Secured Borrowings
Pricing margin (as a percent)	3.35%
Maximum borrowing capacity	$ 388,800
Secured Borrowings
Secured Borrowings
Maximum Facility Size	22,321,961
Long term debt, gross	12,625,490	13,948,828
Unamortized net discount	(23,530)	(24,975)
Unamortized deferred financing costs	(45,473)	(55,857)
Secured financing agreements, net	12,556,487	13,867,996
Secured Borrowings | Borrowing Base Facility
Secured Borrowings
Maximum Facility Size	750,000
Long term debt, gross	5,384	27,639
Secured Borrowings | Commercial Financing Facilities
Secured Borrowings
Maximum Facility Size	571,030
Long term debt, gross	408,210	387,822
Secured Borrowings | Infrastructure Financing Facilities
Secured Borrowings
Maximum Facility Size	1,050,000
Long term debt, gross	$ 594,211	631,187
Secured Borrowings | Property Mortgages - Fixed rate
Secured Borrowings
Coupon Rate	4.52%
Maximum Facility Size	$ 29,797
Long term debt, gross	29,797	29,898
Secured Borrowings | Property Mortgages - Variable rate
Secured Borrowings
Maximum Facility Size	707,941
Long term debt, gross	705,916	853,145
Secured Borrowings | Term Loans and Revolver
Secured Borrowings
Maximum Facility Size	1,513,281
Long term debt, gross	1,363,281	1,366,778
Secured Borrowings | Total Other Secured Financing
Secured Borrowings
Maximum Facility Size	4,622,049
Long term debt, gross	$ 3,106,799	3,296,469
Secured Borrowings | First Mortgage and Mezzanine
Secured Borrowings
Coupon Rate	3.46%
Long term debt, gross	$ 600,000
Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	16,508,835
Secured Borrowings | Asset Pledged as Collateral | Borrowing Base Facility
Secured Borrowings
Pledged Asset Carrying Value	104,276
Secured Borrowings | Asset Pledged as Collateral | Commercial Financing Facilities
Secured Borrowings
Pledged Asset Carrying Value	580,687
Secured Borrowings | Asset Pledged as Collateral | Infrastructure Financing Facilities
Secured Borrowings
Pledged Asset Carrying Value	818,997
Secured Borrowings | Asset Pledged as Collateral | Property Mortgages - Fixed rate
Secured Borrowings
Pledged Asset Carrying Value	32,436
Secured Borrowings | Asset Pledged as Collateral | Property Mortgages - Variable rate
Secured Borrowings
Pledged Asset Carrying Value	677,616
Secured Borrowings | Asset Pledged as Collateral | Total Other Secured Financing
Secured Borrowings
Pledged Asset Carrying Value	$ 2,214,012
Secured Borrowings | Index | Commercial Financing Facilities
Secured Borrowings
Pricing margin (as a percent)	2.24%
Secured Borrowings | Index | Infrastructure Financing Facilities
Secured Borrowings
Pricing margin (as a percent)	2.15%
Secured Borrowings | SOFR | Borrowing Base Facility
Secured Borrowings
Pricing margin (as a percent)	2.11%
Secured Borrowings | SOFR | First Mortgage and Mezzanine | Weighted Average
Secured Borrowings
Pricing margin (as a percent)	2.18%
Line of Credit | Commercial Financing Facilities
Secured Borrowings
Line of credit capacity if conditions are met	$ 571,000
Commercial Loans
Secured Borrowings
Maximum Facility Size	11,800,000
Secured financing agreements, net	2,500,000
Line of credit capacity if conditions are met	$ 12,200,000
Commercial Loans | SOFR | Weighted Average
Secured Borrowings
Pricing margin (as a percent)	2.73%
Commercial Loans | Secured Borrowings
Secured Borrowings
Maximum Facility Size	$ 12,234,452
Long term debt, gross	6,010,151	7,170,389
Commercial Loans | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	$ 9,736,328
Commercial Loans | Secured Borrowings | Index
Secured Borrowings
Pricing margin (as a percent)	2.05%
Residential Loans | Secured Borrowings
Secured Borrowings
Maximum Facility Size	$ 3,450,000
Long term debt, gross	2,269,811	2,287,655
Residential Loans | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	$ 2,516,364
Residential Loans | Secured Borrowings | SOFR
Secured Borrowings
Pricing margin (as a percent)	1.90%
Infrastructure Loans | Secured Borrowings
Secured Borrowings
Maximum Facility Size	$ 650,000
Long term debt, gross	475,763	453,217
Infrastructure Loans | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	$ 571,784
Infrastructure Loans | Secured Borrowings | SOFR
Secured Borrowings
Pricing margin (as a percent)	2.07%
Conduit Loans | Secured Borrowings
Secured Borrowings
Maximum Facility Size	$ 375,000
Long term debt, gross	56,507	26,930
Conduit Loans | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	$ 72,402
Conduit Loans | Secured Borrowings | SOFR
Secured Borrowings
Pricing margin (as a percent)	2.15%
CMBS/RMBS
Secured Borrowings
Coupon Rate	3.54%
Secured financing agreements, net	$ 279,000
Amount outstanding on a repurchase facility not subject to margin calls	279,000
Amount outstanding on repurchase facility	$ 32,200
Pro rata share owned by a non-controlling partner in a consolidated joint venture	49.00%
CMBS/RMBS | Certain Facilities
Secured Borrowings
Secured financing agreements, net	$ 330,900
Rolling maturity period	12 months
CMBS/RMBS | SOFR | Weighted Average
Secured Borrowings
Coupon Rate	2.19%
CMBS/RMBS | Secured Borrowings
Secured Borrowings
Maximum Facility Size	$ 990,460
Long term debt, gross	706,459	714,168
CMBS/RMBS | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	1,397,945
Total Repurchase Agreements | Secured Borrowings
Secured Borrowings
Maximum Facility Size	17,699,912
Long term debt, gross	9,518,691	$ 10,652,359
Total Repurchase Agreements | Secured Borrowings | Asset Pledged as Collateral
Secured Borrowings
Pledged Asset Carrying Value	$ 14,294,823