S000001577 [Member] Average Annual Total Returns	12 Months Ended	60 Months Ended	120 Months Ended
S000001577 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Bloomberg U.S. Universal Index (reflects no deduction for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	7.58%	0.06%	2.44%
Moderate Strategy Linked Composite Index (reflects no deduction for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	12.88%	4.80%	6.45%
Class R5
Prospectus [Line Items]
Average Annual Return, Percent	11.87%	3.86%	4.30%
Class M
Prospectus [Line Items]
Average Annual Return, Percent	12.45%	4.31%	4.74%
Class A
Prospectus [Line Items]
Average Annual Return, Percent	5.74%	2.91%	3.95%
Class C
Prospectus [Line Items]
Average Annual Return, Percent	11.43%	3.35%	3.78%
Class S
Prospectus [Line Items]
Average Annual Return, Percent	12.45%	4.31%	4.74%
Class S \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	11.02%	2.97%	3.38%
Class S \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	7.49%	2.94%	3.29%
Class R1
Prospectus [Line Items]
Average Annual Return, Percent	12.48%	4.38%	4.83%