Fair Value [Line Items]

No definition available.

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings And Other Comprehensive Income

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

This element represents total net realized gains or losses for the period, arising from liabilities 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

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings and other comprehensive income.

+ References

No definition available.

+ Details

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- Definition

Total contractual amount of unfunded commitments for which the fair value option was elected.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Fair value of unfunded commitments for which the fair value option was elected.

+ References

No definition available.

+ Details

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- Definition

Other Secured Financing, Measurement Input.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

+ Details

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- Definition

This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

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Fair Value Option - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) yr	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) yr	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Fair Value [Line Items]
Fair value of unfunded commitments for which the fair value option was elected	$ 19		$ 19		$ 45
Total contractual amount of unfunded commitments for which the fair value option was elected	9,140		9,140		7,720
Net Gains (Losses) Attributable to the Impact of Changes in Instrument-Specific Credit Spreads on Loans and Lending Commitments For Which the Fair Value Option Was Elected	(22)	$ 55	161	$ 247
Unsecured Long-Term Borrowings at Fair Value [Member]
Fair Value [Line Items]
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value	$ 0		$ 0		$ 3,470
Minimum [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Yield [Member]
Fair Value [Line Items]
Other secured financing measurement input	0.033		0.033
Minimum [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Duration [Member]
Fair Value [Line Items]
Other secured financing measurement input \| yr	1.2		1.2
Maximum [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Yield [Member]
Fair Value [Line Items]
Other secured financing measurement input	0.176		0.176
Maximum [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Duration [Member]
Fair Value [Line Items]
Other secured financing measurement input \| yr	2.8		2.8
Weighted Average [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Yield [Member]
Fair Value [Line Items]
Other secured financing measurement input	0.052		0.052
Weighted Average [Member] \| Other Secured Financings at Fair Value [Member] \| Level 3 [Member] \| Fair Value Unobservable Inputs, Duration [Member]
Fair Value [Line Items]
Other secured financing measurement input \| yr	2.6		2.6
Other Financial Liabilities [Member]
Fair Value [Line Items]
Gains/(Losses) on liabilities	$ (320)	(212)	$ (2,150)	458
Realized Gains/(Losses) on liabilities	(135)	(47)	(307)	(161)
Net Unrealized Gains / (Losses)	(185)	(165)	(1,839)	619
Other Financial Liabilities [Member] \| Unsecured Long-Term Borrowings at Fair Value [Member]
Fair Value [Line Items]
Realized Gains/(Losses) on liabilities	(96)	(13)	(244)	(27)
Other Financial Liabilities [Member] \| Other Secured Financings at Fair Value [Member]
Fair Value [Line Items]
Realized Gains/(Losses) on liabilities	4	3	19	6
Net Unrealized Gains / (Losses)	(5)	(4)	(24)	(8)
Other Financial Liabilities [Member] \| Debt Valuation Adjustment [Member]
Fair Value [Line Items]
Fair Value, Measured on Recurring Basis, Gains/(Losses) Included in condensed consolidated statements of comprehensive income	41	(133)	(362)	52
Other Financial Liabilities [Member] \| Market making [Member]
Fair Value [Line Items]
Fair Value, Measured on Recurring Basis, Gains/(Losses) Included in condensed consolidated statements of earnings	(361)	(79)	(1,780)	405
Other Financial Liabilities [Member] \| Other Principal Transactions [Member]
Fair Value [Line Items]
Fair Value, Measured on Recurring Basis, Gains/(Losses) Included in condensed consolidated statements of earnings	4	1	(2)	3
Other Financial Liabilities [Member] \| Interest Expense [Member]
Fair Value [Line Items]
Fair Value, Measured on Recurring Basis, Gains/(Losses) Included in condensed consolidated statements of earnings	$ (4)	$ (1)	$ (4)	$ (2)