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, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ (24)	$ (102)	$ (120)	$ (96)
Seed Investment [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	(17)	(81)	(117)	(196)
Deferred Cash Compensation Plans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ (1)	$ 13	$ 20	$ 26

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details