v3.10.0.1
Schedule of Investments - Forward Agreements (Detail)
 6 Months Ended
Jun. 30, 2018
USD ($)
ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation)/Value $ (7,152,896) [1]
ProShares Ultra Gold [Member] | Forward agreements with Citibank N.A. based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.55% [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ 47,200 [1]
Notional Amount at Value 59,059,000 [1],[3]
Unrealized Appreciation (Depreciation)/Value $ (2,546,835) [1]
ProShares Ultra Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.67% [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ 37,420 [1]
Notional Amount at Value 46,820,652 [1],[3]
Unrealized Appreciation (Depreciation)/Value $ (1,977,494) [1]
ProShares Ultra Gold [Member] | Forward agreements with Societe Generale based on 0.995 Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.67% [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ 13,000 [1]
Notional Amount at Value 16,265,860 [1],[3]
Unrealized Appreciation (Depreciation)/Value $ (676,179) [1]
ProShares Ultra Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.53% [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ 33,400 [1]
Notional Amount at Value 41,789,746 [1],[3]
Unrealized Appreciation (Depreciation)/Value (1,952,388) [1]
ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation)/Value $ (14,148,711) [4]
ProShares Ultra Silver [Member] | Forward agreements with Citibank N.A. based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.65% [2],[4]
Settlement Date Jul. 06, 2018 [4]
Commitment to (Deliver)/Receive $ 8,802,000 [4]
Notional Amount at Value 141,190,241 [3],[4]
Unrealized Appreciation (Depreciation)/Value $ (4,560,857) [4]
ProShares Ultra Silver [Member] | Forward agreements with Goldman Sachs International based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.85% [2],[4]
Settlement Date Jul. 06, 2018 [4]
Commitment to (Deliver)/Receive $ 7,030,800 [4]
Notional Amount at Value 112,778,954 [3],[4]
Unrealized Appreciation (Depreciation)/Value $ (4,075,705) [4]
ProShares Ultra Silver [Member] | Forward agreements with Societe Generale based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.83% [2],[4]
Settlement Date Jul. 06, 2018 [4]
Commitment to (Deliver)/Receive $ 3,284,000 [4]
Notional Amount at Value 52,677,330 [3],[4]
Unrealized Appreciation (Depreciation)/Value $ (1,789,967) [4]
ProShares Ultra Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) 2.85% [2],[4]
Settlement Date Jul. 06, 2018 [4]
Commitment to (Deliver)/Receive $ 6,865,000 [4]
Notional Amount at Value 110,119,406 [3],[4]
Unrealized Appreciation (Depreciation)/Value (3,722,182) [4]
ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation)/Value $ 2,276,610 [1]
ProShares UltraShort Gold [Member] | Forward agreements with Citibank N.A. based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (2.05%) [1],[5]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (14,300) [1]
Notional Amount at Value (17,892,875) [1],[6]
Unrealized Appreciation (Depreciation)/Value $ 802,900 [1]
ProShares UltraShort Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (1.82%) [1],[5]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (12,498) [1]
Notional Amount at Value (15,637,748) [1],[6]
Unrealized Appreciation (Depreciation)/Value $ 615,251 [1]
ProShares UltraShort Gold [Member] | Forward agreements with Societe Generale based on 0.995 Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (1.77%) [1],[5]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (4,800) [1]
Notional Amount at Value (6,005,856) [1],[6]
Unrealized Appreciation (Depreciation)/Value $ 246,078 [1]
ProShares UltraShort Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (1.73%) [1],[5]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (10,150) [1]
Notional Amount at Value (12,699,579) [1],[6]
Unrealized Appreciation (Depreciation)/Value 612,381 [1]
ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation)/Value $ 1,452,785 [1]
ProShares UltraShort Silver [Member] | Forward agreements with Citibank N.A. based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (2.15%) [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (1,093,000) [1]
Notional Amount at Value (17,532,485) [1],[3]
Unrealized Appreciation (Depreciation)/Value $ 582,164 [1]
ProShares UltraShort Silver [Member] | Forward agreements with Goldman Sachs International based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (2.00%) [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (851,500) [1]
Notional Amount at Value (13,658,656) [1],[3]
Unrealized Appreciation (Depreciation)/Value $ 402,097 [1]
ProShares UltraShort Silver [Member] | Forward agreements with Societe Generale based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (1.93%) [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (156,000) [1]
Notional Amount at Value (2,502,334) [1],[3]
Unrealized Appreciation (Depreciation)/Value $ 83,545 [1]
ProShares UltraShort Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]  
Schedule of Investments [Line Items]  
Rate Paid (Received) (1.95%) [1],[2]
Settlement Date Jul. 06, 2018 [1]
Commitment to (Deliver)/Receive $ (781,000) [1]
Notional Amount at Value (12,527,787) [1],[3]
Unrealized Appreciation (Depreciation)/Value $ 384,979 [1]
[1] The positions and counterparties herein are as of June 30, 2018. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2] Reflects the floating financing rate, as of June 30, 2018, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions. Forward Agreements payment is due at termination/maturity.
[3] For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[4] The positions and counterparties herein are as of June 30, 2018. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[5] Reflects the floating financing rate, as of June 30, 2018, on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions. Total Return Swap Agreements payment is due at termination/maturity.
[6] For swap agreements, a positive amount represents "long" exposure to the benchmark index. A negative amount represents "short" exposure to the benchmark index.