v3.26.1
Investments In Affiliates - Schedule of Investment Activity in Affiliated Fund (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Investments [Line Items]        
Purchases at Cost     $ 3,170,100,180 $ 0
Change in Unrealized Appreciation (Depreciation) $ (139,515,325) $ (256,039,064) (692,782,517) (96,121,534)
Realized Gain (Loss) (1,095,488,840) 406,051,436 (90,749,924) 653,081,996
Dividend Income 14,923,797 0 21,519,338 0
Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 1,809,191,600   0  
Purchases at Cost 530,496,700   3,170,100,180  
Proceeds from Sales (1,080,825,590)   (1,911,600,040)  
Change in Unrealized Appreciation (Depreciation) 57,360 0 170,980 0
Realized Gain (Loss) (62,770) $ 0 186,180 $ 0
Ending, Value 1,258,857,300   1,258,857,300  
Dividend Income 14,923,797   21,519,338  
Proshares Short VIX Short-Term Futures ETF [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 60,042,000   0  
Purchases at Cost 15,022,500   85,050,500  
Proceeds from Sales 0   (10,009,000)  
Change in Unrealized Appreciation (Depreciation) (19,500)   (1,500)  
Realized Gain (Loss) 0   5,000  
Ending, Value 75,045,000   75,045,000  
Dividend Income 583,084   790,653  
Proshares Ultra Bloomberg Crude Oil [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 230,138,000   0  
Purchases at Cost 0   250,204,460  
Proceeds from Sales (160,117,232)   (180,127,232)  
Change in Unrealized Appreciation (Depreciation) 60,660   21,000  
Realized Gain (Loss) (32,428)   (49,228)  
Ending, Value 70,049,000   70,049,000  
Dividend Income 1,114,675   1,803,495  
Proshares Ultra Bloomberg Natural Gas [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 140,084,000   0  
Purchases at Cost 0   140,103,500  
Proceeds from Sales (40,026,588)   (40,026,588)  
Change in Unrealized Appreciation (Depreciation) 40,000   20,500  
Realized Gain (Loss) (27,412)   (27,412)  
Ending, Value 100,070,000   100,070,000  
Dividend Income 1,044,838   1,478,171  
Proshares Ultra Gold [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 340,238,000   0  
Purchases at Cost 0   520,242,150  
Proceeds from Sales (160,102,202)   (340,294,902)  
Change in Unrealized Appreciation (Depreciation) (48,000)   54,000  
Realized Gain (Loss) 38,202   124,752  
Ending, Value 180,126,000   180,126,000  
Dividend Income 2,546,130   3,978,367  
Proshares Ultra Silver [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 405,283,500   0  
Purchases at Cost 200,175,250   1,000,582,250  
Proceeds from Sales (325,262,299)   (720,634,299)  
Change in Unrealized Appreciation (Depreciation) (37,500)   84,000  
Realized Gain (Loss) 37,049   164,049  
Ending, Value 280,196,000   280,196,000  
Dividend Income 4,043,046   5,973,753  
Proshares Ultra VIX Short Term Futures ETF [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 105,073,500   0  
Purchases at Cost 70,065,500   225,163,000  
Proceeds from Sales (125,095,423)   (175,146,223)  
Change in Unrealized Appreciation (Depreciation) (4,800)   10,000  
Realized Gain (Loss) (8,777)   3,223  
Ending, Value 50,030,000   50,030,000  
Dividend Income 760,092   1,098,093  
Proshares Ultra Yen [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 16,011,200   0  
Purchases at Cost 0   16,006,400  
Proceeds from Sales (5,003,897)   (5,003,897)  
Change in Unrealized Appreciation (Depreciation) (2,600)   2,200  
Realized Gain (Loss) 1,897   1,897  
Ending, Value 11,006,600   11,006,600  
Dividend Income 120,938   174,435  
Proshares Ultra Short Bloomberg Crude Oil [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 290,174,000   0  
Purchases at Cost 170,154,250   460,471,670  
Proceeds from Sales (160,144,701)   (160,144,701)  
Change in Unrealized Appreciation (Depreciation) 98,000   (45,420)  
Realized Gain (Loss) (71,549)   (71,549)  
Ending, Value 300,210,000   300,210,000  
Dividend Income 3,019,466   3,700,898  
Proshares Ultra Short Bloomberg Natural Gas [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 80,048,000   0  
Purchases at Cost 0   140,056,000  
Proceeds from Sales (35,023,778)   (95,072,278)  
Change in Unrealized Appreciation (Depreciation) (2,500)   13,500  
Realized Gain (Loss) 9,778   34,278  
Ending, Value 45,031,500   45,031,500  
Dividend Income 443,285   744,332  
Proshares Ultra Short Euro [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 10,007,000   0  
Purchases at Cost 0   10,004,000  
Proceeds from Sales 0   0  
Change in Unrealized Appreciation (Depreciation) (1,000)   2,000  
Realized Gain (Loss) 0   0  
Ending, Value 10,006,000   10,006,000  
Dividend Income 88,387   121,823  
Proshares UltraShort Gold [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 25,017,500   0  
Purchases at Cost 15,013,500   45,025,500  
Proceeds from Sales (10,005,794)   (15,009,544)  
Change in Unrealized Appreciation (Depreciation) (1,000)   6,500  
Realized Gain (Loss) (3,206)   (1,456)  
Ending, Value 30,021,000   30,021,000  
Dividend Income 237,897   321,487  
Proshares UltraShort Silver [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 10,007,000   0  
Purchases at Cost 30,027,700   140,109,950  
Proceeds from Sales (20,014,588)   (120,093,788)  
Change in Unrealized Appreciation (Depreciation) (1,450)   (1,950)  
Realized Gain (Loss) (4,662)   (212)  
Ending, Value 20,014,000   20,014,000  
Dividend Income 195,906   270,134  
Proshares Ultra Short Yen [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 7,004,900   0  
Purchases at Cost 0   7,002,800  
Proceeds from Sales 0   0  
Change in Unrealized Appreciation (Depreciation) (700)   1,400  
Realized Gain (Loss) 0   0  
Ending, Value 7,004,200   7,004,200  
Dividend Income 61,871   85,276  
Proshares VIX Mid-Term Futures ETF [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 20,014,000   0  
Purchases at Cost 0   20,008,000  
Proceeds from Sales (5,005,397)   (5,005,397)  
Change in Unrealized Appreciation (Depreciation) (3,000)   3,000  
Realized Gain (Loss) 3,397   3,397  
Ending, Value 15,009,000   15,009,000  
Dividend Income 152,911   219,783  
Proshares VIX Short-Term Futures ETF [Member] | Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Beginning, Value 70,049,000   0  
Purchases at Cost 30,038,000   110,070,000  
Proceeds from Sales (35,023,691)   (45,032,191)  
Change in Unrealized Appreciation (Depreciation) (19,250)   1,750  
Realized Gain (Loss) (5,059)   (559)  
Ending, Value 65,039,000   65,039,000  
Dividend Income $ 511,271   $ 758,638