S000010795 [Member] Average Annual Total Returns	12 Months Ended	15 Months Ended	60 Months Ended	106 Months Ended	120 Months Ended	158 Months Ended	317 Months Ended	327 Months Ended
S000010795 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	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%
C000253706 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	14.14%		13.74%		14.27%
Performance Inception Date		Oct. 02, 2024
C000029865 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	7.35%		12.13%		13.32%
Performance Inception Date							Aug. 02, 1999
C000029865 [Member] \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	6.59%		10.62%		11.78%
Performance Inception Date							Aug. 02, 1999
C000029865 [Member] \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	4.80%		9.25%		10.57%
Performance Inception Date							Aug. 02, 1999
C000029867 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	12.05%		12.61%		13.14%
Performance Inception Date							Aug. 02, 1999
C000029868 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	14.15%		13.73%		14.27%
Performance Inception Date								Oct. 02, 1998
C000122583 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	14.21%		13.81%		14.35%
Performance Inception Date						Nov. 08, 2012
C000173198 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	14.30%		13.88%		14.39%
Performance Inception Date				Mar. 01, 2017