Regulation and Capital Adequacy - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
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%
Global Systemically Important Bank (G-SIB) surcharge	2.50%	2.50%	2.50%
Counter-cyclical capital buffer	0.00%	0.00%	0.00%
Tier 1 leverage ratio	4.00%	4.00%	4.00%
SLR	5.00%	5.00%	5.00%
Minimum supplementary leverage ratio buffer	2.00%	2.00%
Minimum supplementary leverage ratio	3.00%	3.00%
Confidence level for regulatory VaR			99.00%
Confidence level for risk management VaR			95.00%
Time horizon for regulatory VaR (in days)		10 days
Time horizon for risk management VaR (in days)		1 day
Equity investment in subsidiaries	$ 95,680	$ 95,680	$ 90,220
Minimum equity capital that is required to be maintained in regulated subsidiaries	$ 57,580	57,580	52,920
Increase in advanced CET1 ratio due to changes to the calculation of loss given default	1.00%
Standardized Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Change in Credit RWAs		25,649	5,108
Change in Market RWAs		(9,984)	(12,809)
Change in operational risk		0
Advanced Capital [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Change in Credit RWAs		(7,672)	(44,566)
Change in Market RWAs		(10,186)	(12,282)
Change in operational risk		$ 4,400	$ (2,687)
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	$ 50,550	$ 50,550	$ 29,200
Excess amount deposited by GS Bank USA held at the Federal Reserve Bank of New York	$ 50,290	$ 50,290	$ 29,030
Increase in advanced CET1 ratio due to changes to the calculation of loss given default	2.20%