Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Condensed Consolidated Statements of Income on Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 47	$ 6	$ 16	$ 43
Seed Investment Member
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	(78)	81	(127)	6
Deferred cash compensation plans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 9	$ (9)	$ 23	$ 8