v3.26.1
Goldman Sachs US Mortgages Fund Average Annual Total Returns - Class A Inst Inv Separate Account Inst R6 Shares [Member]
 12 Months Ended 60 Months Ended 120 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg U.S. Securitized Bond Index[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   8.49% 0.22% 1.68%
Bloomberg U.S. Aggregate Bond Index[Member]        
Prospectus [Line Items]        
Average Annual Return, Percent   7.30% (0.36%) 2.01%
Class A Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   3.92% (1.18%) 0.86%
Performance Inception Date Nov. 03, 2003      
Class A Shares | After Taxes on Distributions        
Prospectus [Line Items]        
Average Annual Return, Percent   2.35% (2.34%) (0.25%)
Class A Shares | After Taxes on Distributions and Sales        
Prospectus [Line Items]        
Average Annual Return, Percent   2.29% (1.39%) 0.17%
Institutional Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   8.29% (0.06%) 1.59%
Performance Inception Date Nov. 03, 2003      
Service Shares        
Prospectus [Line Items]        
Average Annual Return, Percent [1]   8.21% (0.17%) 1.50%
Performance Inception Date Feb. 20, 2026      
Investor Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   8.21% (0.17%) 1.50%
Performance Inception Date Jul. 29, 2011      
Separate Account Institutional Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   8.32% (0.08%) 1.60%
Performance Inception Date Nov. 03, 2003      
Class R Shares        
Prospectus [Line Items]        
Average Annual Return, Percent [2]   8.21% (0.17%) 1.50%
Performance Inception Date Feb. 20, 2026      
Class R6 Shares        
Prospectus [Line Items]        
Average Annual Return, Percent   8.31% (0.08%) 1.59%
Performance Inception Date Jul. 31, 2015      
[1] Service Class Shares commenced operations on February 20, 2026. Because Service Class Shares have not had returns for a full calendar year as of the date of this Prospectus, the figures shown above provide performance for Investor Shares of the Fund. Performance has not been adjusted to reflect the higher expenses of Service Class Shares. Service Class Shares would have had lower returns because: (i) Investor Shares and Service Class Shares represent interests in the same portfolio of securities; and (ii) Service Class Shares have higher expenses.
[2] Class R Shares commenced operations on February 20, 2026. Because Class R Shares have not had returns for a full calendar year as of the date of this Prospectus, the figures shown above provide performance for Investor Shares of the Fund. Performance has not been adjusted to reflect the higher expenses of Class R Shares. Class R Shares would have had lower returns because: (i) Investor Shares and Class R Shares represent interests in the same portfolio of securities; and (ii) Class R Shares have higher expenses.