S000014681 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 1.25% | (0.33%) | 1.35% |
| Bloomberg U.S. MBS: Agency Fixed Rate Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 1.20% | (0.74%) | 0.91% |
| SMASh Series M Fund | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | (1.71%) | (2.92%) | 0.82% |
| SMASh Series M Fund | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | (3.72%) | (4.57%) | (0.89%) |
| SMASh Series M Fund | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | (1.00%) | (2.71%) | 0.07% |