Financial Instruments - Net Realized And Unrealized Gains And Losses On Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net realized gain (loss) on foreign currency forward contracts	$ 2	$ 0	$ 9	$ 0
Net change in unrealized appreciation (depreciation) on foreign currency forward contracts	$ 15	$ 5	31	8
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Net realized gain (loss) on foreign currency forward contracts			9	0
Net change in unrealized appreciation (depreciation) on foreign currency forward contracts			$ 31	$ 8