Non-U.S. Activities - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Total assets	$ 338,003		$ 297,258
Non-U.S.
Segment Reporting Information [Line Items]
Management fees, percent	0.25	0.25
Service fees, percent	0.47	0.46
Total assets	$ 86,400	$ 81,760