XML 42 R27.htm IDEA: XBRL DOCUMENT v3.20.2
Service Providers and Related Party Agreements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transaction [Line Items]        
Management fee percentage per annum of daily NAV     0.75%  
Fee waiver term     The Managing Owner has contractually agreed to waive indefinitely the fees that it receives in an amount equal to the indirect management fees that the Fund incurs through its investments in affiliated money market mutual funds and/or affiliated T-Bill ETFs. The Managing Owner may terminate this fee waiver on 60 days notice.  
Managing owner waived fees $ 23,181 $ 6,946 $ 41,891 $ 14,715
Managing Owner [Member]        
Related Party Transaction [Line Items]        
Fee waiver term     60 days