S000010818 [Member] Average Annual Total Returns	12 Months Ended	15 Months Ended	60 Months Ended		120 Months Ended	198 Months Ended	239 Months Ended	353 Months Ended
S000010818 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Feb. 28, 2026	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
S&P 500® Index (reflects no deductions for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	17.88%		14.42%		14.82%
C000253708 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	16.95%		14.90%		14.09%
Performance Inception Date		Oct. 02, 2024
C000030031 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	16.63%			14.83%	14.05%
Performance Inception Date								Jul. 31, 1996
C000030031 [Member] \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	12.93%			11.07%	11.19%
Performance Inception Date								Jul. 31, 1996
C000030031 [Member] \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	11.65%			10.76%	10.71%
Performance Inception Date								Jul. 31, 1996
C000030032 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	16.37%		14.54%		13.77%
Performance Inception Date							Jan. 23, 2006
C000030033 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	16.95%		15.11%		14.34%
Performance Inception Date								Jul. 31, 1996
C000079027 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.10%		15.31%		14.52%
Performance Inception Date						Jul. 15, 2009