Joint Ventures - BCRED Emerald JV and BCRED Verdelite JV (Details) - USD ($)				9 Months Ended	12 Months Ended
	Oct. 21, 2022	Sep. 26, 2022	Sep. 25, 2022	Sep. 30, 2023	Dec. 31, 2022
BCRED Emerald JV LP
Schedule of Equity Method Investments [Line Items]
Committed contribution		$ 2,250,000,000	$ 1,500,000,000
Capital contribution		940,500,000		$ 2,002,500,000	$ 2,115,000,000
Payments to acquire equity method investments		670,200,000	733,400,000
In-kind capital investments contributed		270,300,000
Proceeds from sale of investments		1,971,600,000
Equity ownership percentage				75.00%
Available capital				$ 247,500,000	135,000,000
BCRED Emerald JV LP | JV Partner
Schedule of Equity Method Investments [Line Items]
Committed contribution		750,000,000	500,000,000
Contributed net assets			244,500,000
Aggregate cost of assets contributed			$ 977,800,000
Capital contribution		313,500,000		$ 667,500,000	705,000,000
Payments to acquire equity method investments		251,400,000
In-kind capital investments contributed		$ 62,100,000
Equity ownership percentage				25.00%
Available capital				$ 82,500,000	45,000,000
BCRED Verdelite JV LP
Schedule of Equity Method Investments [Line Items]
Committed contribution	$ 147,000,000
Capital contribution	26,200,000
Payments to acquire equity method investments	117,700,000			$ 117,700,000
In-kind capital investments contributed	91,500,000
Equity ownership percentage				87.50%
Available capital				$ 29,300,000
BCRED Verdelite JV LP | JV Partner
Schedule of Equity Method Investments [Line Items]
Committed contribution	21,000,000
Payments to acquire equity method investments	$ 16,800,000				16,800,000
Equity ownership percentage				12.50%
Available capital					$ 4,200,000