Fair Value Hierarchy - Trading Cash Instruments, Additional Information (Detail) - Trading cash instruments, fair value disclosure - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized and unrealized gains (losses) on level 3 trading cash instrument assets	$ (19)	$ 84	$ 107	$ 1,410
Net realized gains / (losses) on assets	22	40	129	85
Net unrealized gains/(losses)	(41)	(124)	(22)	(1,500)
Market making
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized and unrealized gains (losses) on level 3 trading cash instrument assets	(36)	(106)	61	(1,460)
Interest income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net realized and unrealized gains (losses) on level 3 trading cash instrument assets	$ 17	$ 22	$ 46	$ 53

Fair value measurement with unobservable inputs reconciliation recurring basis asset gain loss included in earnings.

No definition available.

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- Definition

This element represents total net realized gains or losses for the period, arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

+ References

No definition available.

+ Details

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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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.

+ References

No definition available.

+ Details

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