v3.26.1
S000006016 [Member] Average Annual Total Returns
 12 Months Ended 60 Months Ended 115 Months Ended 120 Months Ended 517 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FTSE 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent 4.40% 3.31%   2.23% 3.61% [1]
Performance Inception Date         Dec. 01, 1982
S&P 500 (reflects no deduction for fees, expenses or taxes)          
Prospectus [Line Items]          
Average Annual Return, Percent 17.88% 14.42%   14.82% 12.05% [1]
Performance Inception Date         Dec. 01, 1982
Class I          
Prospectus [Line Items]          
Average Annual Return, Percent 28.78% 12.52%   11.19% 7.07% [1]
Performance Inception Date         Dec. 01, 1982
Class I | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 27.62% 11.93%   10.41% 6.38% [1]
Performance Inception Date         Dec. 01, 1982
Class I | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 17.55% 9.86%   9.00% 5.95% [1]
Performance Inception Date         Dec. 01, 1982
Class C          
Prospectus [Line Items]          
Average Annual Return, Percent 27.49% 11.40% 9.71% [1]  
Performance Inception Date     May 31, 2016    
Class A          
Prospectus [Line Items]          
Average Annual Return, Percent 28.45% 12.24% 10.54% [1]  
Performance Inception Date     May 31, 2016    
[1] Inception date for Class I shares was December 1, 1982. Inception date for Class A and Class C shares was May 31, 2016. Date used to calculate performance since inception for the indices is the inception date of the Class I shares.