v3.21.1
Investments - Offsetting of Financial Assets and Liabilities (Detail) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Swap Agreements [Member]    
Derivative [Line Items]    
Net Amounts of Assets presented in the Statements of Financial Condition $ 6,931,663 $ 80,135,841
Net Amounts of Liabilities presented in the Statements of Financial Condition 69,855,064 3,491,096
Foreign Currency Forward Contracts [Member]    
Derivative [Line Items]    
Net Amounts of Assets presented in the Statements of Financial Condition 5,810,029 169,051
Net Amounts of Liabilities presented in the Statements of Financial Condition 630,820 1,714,898
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 0 18,242,195
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 0 18,242,195
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 40,748,594 0
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 40,748,594 0
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 4,330 89,103
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 4,330 89,103
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 226,734 367
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 226,734 367
ProShares Ultra Gold [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 6,160,430 5,140,980
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 6,160,430 5,140,980
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 0 0
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 0 0
ProShares Ultra Silver [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 0 56,752,666
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 0 56,752,666
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 28,421,003 0
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 28,421,003 0
ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition   0
Gross Amounts Offset in the Statements of Financial Condition   0
Net Amounts of Assets presented in the Statements of Financial Condition   0
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition   24,807
Gross Amounts Offset in the Statements of Financial Condition   0
Net Amounts of Liabilities presented in the Statements of Financial Condition   24,807
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 3,041 67,235
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 3,041 67,235
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 192,043 148
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 192,043 148
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 3,436,568 5,705
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 3,436,568 5,705
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 181,875 1,142,409
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 181,875 1,142,409
ProShares UltraShort Gold [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 0 0
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 0 0
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 685,467 268,728
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 685,467 268,728
ProShares UltraShort Silver [Member] | Swap Agreements [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 771,233 0
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 771,233 0
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 0 3,197,561
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition 0 3,197,561
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]    
Derivative [Line Items]    
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition 2,366,090 7,008
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Assets presented in the Statements of Financial Condition 2,366,090 7,008
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition 30,168 571,974
Gross Amounts Offset in the Statements of Financial Condition 0 0
Net Amounts of Liabilities presented in the Statements of Financial Condition $ 30,168 $ 571,974