S000006017 [Member] Average Annual Total Returns

12 Months Ended

60 Months Ended

120 Months Ended

463 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

FTSE 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

4.40%

3.31%

2.23%

3.10%

^[1]

Performance Inception Date

May 26, 1987

Class I

Prospectus [Line Items]

Average Annual Return, Percent

4.19%

1.78%

1.17%

2.21%

^[1]

Performance Inception Date

May 26, 1987

Class I | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

2.79%

1.14%

0.75%

1.65%

^[1]

Performance Inception Date

May 26, 1987

Class I | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

2.48%

1.09%

0.72%

1.55%

^[1]

Performance Inception Date

May 26, 1987

[1]	Inception date for Class I shares was May 26, 1987. Date used to calculate performance since inception for the index is the inception date of the Class I shares.