v3.25.2
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 19 Months Ended 60 Months Ended 120 Months Ended
May 31, 2025
May 31, 2025
May 31, 2025
May 31, 2025
Without Sales Load [Member] | C000005496        
Average Annual Return [Line Items]        
Average Annual Return, Percent 9.24%   10.98% 8.49%
Without Sales Load [Member] | C000005497        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.97%   10.70% 8.22%
Without Sales Load [Member] | C000005498        
Average Annual Return [Line Items]        
Average Annual Return, Percent 8.69%   10.42% 7.95%
Without Sales Load [Member] | C000244823        
Average Annual Return [Line Items]        
Average Annual Return, Percent 9.40% 17.95%    
Russell 3000 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 13.12%   15.34% 12.21%
Russell 3000 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 13.12%   15.34% 12.21%
Russell 3000 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 13.12%   15.34% 12.21%
Russell 3000 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 13.12% 22.32%    
S&P Target Date 2040 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.87%   11.07% 8.19%
S&P Target Date 2040 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.87%   11.07% 8.19%
S&P Target Date 2040 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.87%   11.07% 8.19%
S&P Target Date 2040 Index        
Average Annual Return [Line Items]        
Average Annual Return, Percent 10.87% 17.74%