Non-U.S. Activities - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Total assets	$ 284,415		$ 284,415		$ 301,450
Non-U.S.
Segment Reporting Information [Line Items]
Management fees, percent	0.25	0.25	0.26	0.26
Service fees, percent	0.47	0.45	0.46	0.46
Total assets	$ 80,750	$ 91,230	$ 80,750	$ 91,230