S000010825 [Member] Average Annual Total Returns	12 Months Ended	60 Months Ended	106 Months Ended	120 Months Ended	158 Months Ended	363 Months Ended	385 Months Ended
S000010825 [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
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%
C000030051 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.30%	13.92%		14.31%
Performance Inception Date						Oct. 10, 1995
C000030051 [Member] \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	10.67%	10.26%		11.60%
Performance Inception Date						Oct. 10, 1995
C000030051 [Member] \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	14.41%	10.46%		11.27%
Performance Inception Date						Oct. 10, 1995
C000030053 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.60%	14.21%		14.59%
Performance Inception Date							Dec. 15, 1993
C000122593 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.60%	14.21%		14.59%
Performance Inception Date					Nov. 08, 2012
C000173199 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	17.59%	14.20%		14.59%
Performance Inception Date			Mar. 01, 2017