v3.26.1
S000069099 [Member] Average Annual Total Returns
12 Months Ended 60 Months Ended 64 Months Ended
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%) (0.24%)
SMASh SERIES CORE COMPLETION FUND      
Prospectus [Line Items]      
Average Annual Return, Percent 5.25% (4.98%) (4.35%)
Performance Inception Date     Aug. 17, 2020
SMASh SERIES CORE COMPLETION FUND | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 3.08% (6.79%) (6.10%)
SMASh SERIES CORE COMPLETION FUND | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 3.08% (4.43%) (3.94%)