Consolidated Sponsored Investment Products - Schedule of Net Gain (Loss) Related to Consolidated VIEs (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Variable Interest Entity [Line Items]
Nonoperating net gain (loss) on consolidated VIEs	$ 58	$ 171
Net income (loss) attributable to NCI on consolidated VIEs	5	50
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Nonoperating net gain (loss) on consolidated VIEs	12	71
Net income (loss) attributable to NCI on consolidated VIEs	$ 8	$ 39