Regulation and Capital Adequacy - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	1.25%	0.625%
Global Systemically Important Bank (G-SIB) buffer	1.25%	0.75%
Counter-cyclical capital buffer	0.00%	0.00%
G-SIB buffer		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
Increased deductions due to transitional provisions, percentage	80.00%	60.00%
Minimum equity capital that is required to be maintained in regulated subsidiaries	$ 48,150	$ 46,490
Scenario, Forecast [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
G-SIB buffer			2.50%
Standardized Capital Rules [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Change in Credit RWAs	12,373	(8,705)
Change in Market RWAs	(1,648)	(18,726)
Basel III Advanced Transitional [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Change in Credit RWAs	10,693	6,005
Change in Market RWAs	(1,510)	(18,506)
Change in Operational RWAs	(557)	(15,500)
GS&Co [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory net capital as defined by Rule 15c3-1	16,090	17,170
Excess amount of regulatory net capital as defined by Rule 15c3-1	13,500	$ 14,660
Amount of broker-dealer tentative net capital required to be held in accordance with Appendix E of Rule 15c3-1	1,000
Amount of broker-dealer net capital required to be held in accordance with Appendix E of Rule 15c3-1	500
Minimum tentative net capital required to be maintained by GS&Co or must notify the SEC	$ 5,000
GS Bank USA [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	1.25%	0.625%
Counter-cyclical capital buffer	0.00%	0.00%
Amount deposited by GS Bank USA held at the Federal Reserve Bank of New York	$ 67,860	$ 74,240
Excess amount deposited by GS Bank USA held at the Federal Reserve Bank of New York	$ 67,800	$ 74,090