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FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Money Market Funds |  |
Loss Contingencies |  |
Deposits in domestic and foreign financial institutions, including cash investments in money market funds | $ 90,000,000 | $ 52,000,000
United States Treasury Obligations |  |
Loss Contingencies |  |
Deposits in domestic and foreign financial institutions, including cash investments in money market funds | $ 1,405,037,213 | $ 1,604,935,976

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