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Fair Value Hierarchy - Trading Cash Instruments, Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Trading cash instruments, fair value disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized gains/(losses)	$ 65	$ 22	$ 101	$ (40)
Net realized gains / (losses) on assets	28	28	71	92
Net unrealized gains/(losses)	37	(6)	30	(52)
Trading cash instruments, fair value disclosure | Market making
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized gains/(losses)	43	8	47	(1)
Trading cash instruments, fair value disclosure | Interest income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized gains/(losses)	22	14	54	41
Trading cash instruments assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized gains / (losses) on assets	28	28	71	92
Net unrealized gains/(losses)	$ 37	$ (6)	$ 30	$ (52)

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