Consolidated Sponsored Investment Products - Schedule of Net Gain (Loss) Related to Consolidated VIEs (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Variable Interest Entity [Line Items]
Nonoperating net gain (loss) on consolidated VIEs	$ 177	$ 114	$ 510	$ 434
Net income (loss) attributable to NCI on consolidated VIEs	60	(9)	152	60
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Nonoperating net gain (loss) on consolidated VIEs	114	(26)	251	113
Net income (loss) attributable to NCI on consolidated VIEs	$ 54	$ (8)	$ 139	$ 65