Regulation and Capital Adequacy - Risk-based Capital Ratios (Detail) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Standardized Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 81,641	$ 74,850	$ 73,116
Tier 1 capital	92,730	85,440	83,702
Tier 2 capital	15,424	14,925	14,926
Total capital	108,154	100,365
RWAs	$ 554,162	$ 563,575	547,910
CET1 capital ratio	0.147	0.133
Tier 1 capital ratio	0.167	0.152
Total capital ratio	0.195	0.178
Advanced Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 81,641	$ 74,850	73,116
Tier 1 capital	92,730	85,440	83,702
Tier 2 capital	13,279	13,473	13,743
Total capital	106,009	98,913
RWAs	$ 609,750	$ 544,653	$ 558,111
CET1 capital ratio	0.134	0.137
Tier 1 capital ratio	0.152	0.157
Total capital ratio	0.174	0.182
GS Bank USA [Member] \| Standardized Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 30,656	$ 29,176
Tier 1 capital	30,656	29,176
Tier 2 capital	6,288	5,293
Total capital	36,944	34,469
RWAs	$ 266,153	$ 258,541
CET1 capital ratio	0.115	0.113
Tier 1 capital ratio	0.115	0.113
Total capital ratio	0.139	0.133
GS Bank USA [Member] \| Advanced Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 30,656	$ 29,176
Tier 1 capital	30,656	29,176
Tier 2 capital	4,903	4,486
Total capital	35,559	33,662
RWAs	$ 165,799	$ 135,596
CET1 capital ratio	0.185	0.215
Tier 1 capital ratio	0.185	0.215
Total capital ratio	0.214	0.248

Amount of total capital as defined by regulatory framework.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

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Amount of Tier 2 risk-based capital as defined by regulatory framework.

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