Regulation and Capital Adequacy - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 01, 2021	Jan. 01, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum required CET1 ratio applicable to advanced approach banking institutions	4.50%	4.50%	4.50%
Minimum required Tier 1 capital ratio applicable to advanced approach banking institutions	6.00%	6.00%	6.00%
Minimum required Total capital ratio applicable to advanced approach banking institutions	8.00%	8.00%	8.00%
Global Systemically Important Bank (G-SIB) surcharge	2.50%	2.50%	2.50%
Counter-cyclical capital buffer	0.00%	0.00%	0.00%
SLR	5.00%	5.00%	5.00%
Minimum supplementary leverage ratio	3.00%	3.00%	3.00%
Minimum supplementary leverage ratio buffer	2.00%	2.00%	2.00%
Confidence level for regulatory VaR	99.00%	99.00%	99.00%
Confidence level for risk management VaR	95.00%	95.00%	95.00%
Time horizon for regulatory VaR (in days)	10 days	10 days
Time horizon for risk management VaR (in days)	1 day	1 day
Equity investment in subsidiaries	$ 103,800	$ 114,930	$ 103,800
Minimum equity capital that is required to be maintained in regulated subsidiaries	$ 63,680	$ 83,570	$ 63,680
Percentage Of Temporary Increase In supplementary leverage ratio	1.00%
Standardized Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Standardized risk based ratios stress capital buffer	6.60%	6.60%	6.60%		6.60%
Change in Credit RWAs		$ 97,192	$ (13,549)
Change in Market RWAs		$ 12,582	$ 4,136
Tier 1 capital ratio	0.151	0.151	0.151
Capital ratio	0.171	0.171	0.171
Standardized Capital Rules [Member] \| Subsequent Event [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum required CET1 ratio applicable to advanced approach banking institutions				13.40%
Standardized risk based ratios stress capital buffer				6.40%
Tier 1 capital ratio				0.149
Capital ratio				0.169
Advanced Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	2.50%	2.50%	2.50%
Change in Credit RWAs		$ 46,979	$ 51,634
Change in Market RWAs		12,582	4,338
Change in operational risk		$ 2,750	$ 9,125
Tier 1 capital ratio	0.110	0.110	0.110
Capital ratio	0.130	0.130	0.130
GS Bank USA [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum required CET1 ratio applicable to advanced approach banking institutions	4.50%	4.50%	4.50%
Minimum required Tier 1 capital ratio applicable to advanced approach banking institutions	6.00%	6.00%	6.00%
Minimum required Total capital ratio applicable to advanced approach banking institutions	8.00%	8.00%	8.00%
Capital conservation buffer	2.50%	2.50%	2.50%
Counter-cyclical capital buffer	0.00%	0.00%	0.00%
Amount deposited by GS Bank USA held at the Federal Reserve Bank of New York	$ 52,710	$ 100,930	$ 52,710
Percentage Of Temporary Increase In supplementary leverage ratio	2.40%

Advanced capital conservation fixed buffer.

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Amount deposited by GS Bank held at the Federal Reserve Bank of New York.

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Change in credit risk-weighted assets.

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Change in market risk-weighted assets.

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Change in operational risk-weighted assets.

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- Definition

Confidence level for regulatory VaR.

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Confidence level for risk management VaR.

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- Definition

Minimum required capital ratio applicable to advanced approach banking institutions.

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No definition available.

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Minimum required CET 1 ratio effective January 2014 applicable to advanced approach banking institutions.

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No definition available.

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Minimum required Tier One capital ratio applicable to advanced approach banking institutions.

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No definition available.

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Supplementary Tier One Leverage Ratio.

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No definition available.

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Percentage of increase in supplementary leverage ratio due to adoption of SLR temporary amendment.

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Required Supplementary Tier One Leverage Ratio

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- Definition

Represents the current amount of the counter cyclical buffer set by the Federal Reserve.

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Represents additional capital surcharge applicable to global systemically important banks.

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Represents stress capital buffer derived from the results of the FRB's stress test under Standardized approach

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- Definition

Supplementary Tier One Leverage Ratio Buffer

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- Definition

Time horizon for regulatory VaR (in days).

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No definition available.

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- Definition

Time horizon for risk management VaR (in days).

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No definition available.

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- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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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.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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- Definition

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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