Cash Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers of cash instruments from level 1 to level 2	$ 182	$ 137
Transfers of cash instruments from level 2 to level 1	33	195
Cash Instruments Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net gains / (losses) on assets	533	110
Net realized gains / (losses) on assets	131	150
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	402	(40)
Cash Instruments Assets [Member] \| Market making [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net gains / (losses) on assets	(10)	(115)
Cash Instruments Assets [Member] \| Other Principal Transactions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net gains / (losses) on assets	396	9
Cash Instruments Assets [Member] \| Interest Income [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net gains / (losses) on assets	$ 147	$ 216

Fair value, cash instruments, level 1 to level 2 transfers, amount.

No definition available.

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- Definition

Fair value, cash instruments, level 2 to level 1 transfers, amount.

+ References

No definition available.

+ Details

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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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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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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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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