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Regulation and Capital Adequacy - Schedule of Minimum Ratios and Well Capitalized Minimum Ratios (Detail)
Sep. 30, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum CET1 ratio applicable to advanced approach banking institutions 5.875% 4.50%
Well-capitalized minimum total capital ratio 10.00%  
GS Bank USA [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum CET1 ratio applicable to advanced approach banking institutions 5.125% 4.50%
Minimum Tier 1 capital ratio applicable to advanced approach banking institutions 6.625% 6.00%
Minimum Total capital ratio applicable to advanced approach banking institutions 8.625% 8.00%
Minimum Tier 1 leverage ratio applicable to advanced approach banking institutions 4.00% 4.00%
Well-capitalized minimum CET1 ratio 6.50%  
Well-capitalized minimum Tier 1 capital ratio 8.00%  
Well-capitalized minimum total capital ratio 10.00%  
Well-capitalized minimum Tier 1 leverage ratio 5.00%