v3.26.1
Goldman Sachs Real Estate Securities Fund Average Annual Total Returns - Class A C Inst Serv Inv R R6 Shares [Member]
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FTSE NAREIT All Equity REITs Index (Total Return, USD, Unhedged)[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   2.27% 4.85% 5.76%
S&P 500® Index[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   17.88% 14.42% 14.81%
Class A Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (6.05%) 3.82% 3.57%
Performance Inception Date Jul. 27, 1998      
Class A Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   (12.83%) 0.98% 0.25%
Class A Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   0.70% 2.65% 2.15%
Class C Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (2.40%) 4.18% 3.37% [1]
Performance Inception Date Jul. 27, 1998      
Institutional Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.21%) 5.34% 4.54%
Performance Inception Date Jul. 27, 1998      
Service Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.68%) 4.85% 4.02%
Performance Inception Date Jul. 27, 1998      
Investor Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.38%) 5.23% 4.41%
Performance Inception Date Nov. 30, 2007      
Class R Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.75%) 4.72% 3.89%
Performance Inception Date Nov. 30, 2007      
Class R6 Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   (0.19%) 5.35% 4.54%
Performance Inception Date Jul. 31, 2015      
[1] Class C Shares automatically convert into Class A Shares eight years after the purchase date. The 10-Year performance for Class C Shares does not reflect the conversion to Class A Shares after the first eight years of performance.