S000000715 [Member] Average Annual Total Returns	12 Months Ended	60 Months Ended	120 Months Ended
S000000715 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	7.30%	(0.36%)	2.01%
Bloomberg U.S. Treasury: U.S. TIPS (reflects no deduction for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	7.01%	1.12%	3.09%
Class FI
Prospectus [Line Items]
Average Annual Return, Percent	6.15%	0.06%	2.15%
Class I
Prospectus [Line Items]
Average Annual Return, Percent	6.41%	0.32%	2.45%
Class I \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	4.66%	(1.95%)	0.88%
Class I \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	3.78%	(0.70%)	1.21%
Class IS
Prospectus [Line Items]
Average Annual Return, Percent	6.45%	0.43%	2.55%
CLASS A
Prospectus [Line Items]
Average Annual Return, Percent	2.13%	(0.82%)	1.71%
CLASS C
Prospectus [Line Items]
Average Annual Return, Percent	4.33%	(0.67%)	1.44%
CLASS R
Prospectus [Line Items]
Average Annual Return, Percent	5.80%	(0.21%)	1.83%
Class C1
Prospectus [Line Items]
Average Annual Return, Percent	4.09%	(0.78%)	1.46%