Derivatives and Hedging - Summary of Fair Values of Derivatives Instruments Recognized in Consolidated Statements of Financial Condition (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Other Assets [Member]
Derivatives Fair Value [Line Items]
Other assets, fair value	$ 35	$ 19
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Other liabilities, fair value	$ 2	$ 6