Non-U.S. Activities - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Total assets	$ 294,561		$ 294,561		$ 301,450
Non-U.S.
Segment Reporting Information [Line Items]
Management fees, percent	0.26	0.25	0.26	0.26
Service fees, percent	0.47	0.47	0.46	0.47
Total assets	$ 76,490	$ 93,350	$ 76,490	$ 93,350