Non-U.S. Activities - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Reporting Information [Line Items]
Total assets	$ 392,165		$ 366,047
Non-U.S.
Segment Reporting Information [Line Items]
Service fees, percent	0.49	0.47
Management fees, percent	0.23	0.24
Total assets	$ 94,160	$ 85,650