v3.25.4
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 105 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000099641        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Class A      
Average Annual Return, Percent 11.95% 12.76%   13.69%
C000099643        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Class C      
Average Annual Return, Percent 15.36% 12.98%   13.40%
C000188496        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Class R6      
C000099644        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Class S      
Without Sales Load [Member] | C000099641        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.22% 13.80%   14.22%
Without Sales Load [Member] | C000099643        
Average Annual Return [Line Items]        
Average Annual Return, Percent 16.36% 12.98%   13.40%
Without Sales Load [Member] | C000188496        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.58% 14.15% 14.59%  
Without Sales Load [Member] | C000099644        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.52% 14.09%   14.51%
DWS Index: S&P 500® Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.88% 14.42%   14.82%
DWS Index: S&P 500® Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.88% 14.42%   14.82%
DWS Index: S&P 500® Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.88% 14.42% 14.84%  
DWS Index: S&P 500® Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 17.88% 14.42%   14.82%