Borrowings - April 2026 UK Bonds (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Apr. 14, 2022 GBP (£)
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 34,855,746	$ 36,037,871
April 2026 UK Bonds | Unsecured debt
Debt Instrument [Line Items]
Aggregate Principal Committed	$ 305,150	$ 301,725	£ 250,000,000
Interest rate			4.875%