Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Total short-term U.S. government and agency obligations, cost		$ 3,038,837,465	$ 3,313,585,456
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		85.00%	91.00%
Total short-term U.S. government and agency obligations, cost		$ 147,990,045	$ 96,075,481
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		99.00%	94.00%
Total short-term U.S. government and agency obligations, cost		$ 45,486,489	$ 25,975,462
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		75.00%	83.00%
Total short-term U.S. government and agency obligations, cost		$ 170,391,741	$ 535,381,199
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		84.00%	80.00%
Total short-term U.S. government and agency obligations, cost		$ 434,676,067	$ 438,333,277
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		102.00%	83.00%
Total short-term U.S. government and agency obligations, cost		$ 205,694,828	$ 79,694,797
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		72.00%	78.00%
Total short-term U.S. government and agency obligations, cost		$ 2,899,188	$ 8,114,653
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		95.00%	97.00%
Total short-term U.S. government and agency obligations, cost		$ 60,540,275	$ 72,981,653
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		94.00%	91.00%
Total short-term U.S. government and agency obligations, cost		$ 21,549,766	$ 50,730,044
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		83.00%	87.00%
Total short-term U.S. government and agency obligations, cost		$ 13,164,807	$ 15,153,202
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		78.00%	90.00%
Total short-term U.S. government and agency obligations, cost		$ 12,909,895	$ 18,409,449
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		97.00%	105.00%
Total short-term U.S. government and agency obligations, cost		$ 337,373,566	$ 546,177,230
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		93.00%	110.00%
Total short-term U.S. government and agency obligations, cost		$ 257,103,135	$ 260,014,650
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		95.00%	102.00%
Total short-term U.S. government and agency obligations, cost		$ 885,046,303	$ 797,652,302
ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		84.00%	69.00%
Total short-term U.S. government and agency obligations, cost		$ 36,183,384	$ 26,806,648
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		104.00%	103.00%
Total short-term U.S. government and agency obligations, cost		$ 95,356,703	$ 71,908,280
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		107.00%	110.00%
Total short-term U.S. government and agency obligations, cost		$ 295,296,440	$ 238,900,176
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		100.00%	107.00%
Total short-term U.S. government and agency obligations, cost		$ 11,891,729	$ 11,605,665
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		95.00%	93.00%
Total short-term U.S. government and agency obligations, cost		$ 5,283,104	$ 5,069,206
U.S. Treasury Bills 0.382% Due 01/12/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.382%
Debt instrument, maturity date	[1],[2]	Jan. 12, 2017
U.S. Treasury Bills 0.330% Due 01/19/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.33%
Debt instrument, maturity date	[1],[2]	Jan. 19, 2017
U.S. Treasury Bills 0.353% Due 01/26/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.353%
Debt instrument, maturity date	[1],[2]	Jan. 26, 2017
U.S. Treasury Bills 0.409% Due 02/02/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.409%
Debt instrument, maturity date	[1],[2]	Feb. 02, 2017
U.S. Treasury Bills 0.409% Due 02/02/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.409%
Debt instrument, maturity date	[2]	Feb. 02, 2017
U.S. Treasury Bills 0.425% Due 02/09/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.425%
Debt instrument, maturity date	[1],[2]	Feb. 09, 2017
U.S. Treasury Bills 0.390% Due 02/16/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.390% Due 02/16/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.390% Due 02/16/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.390% Due 02/16/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.390% Due 02/16/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.493%
Debt instrument, maturity date	[2],[3]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.493%
Debt instrument, maturity date	[2],[4]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.493%
Debt instrument, maturity date	[2],[5]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6]	0.493%
Debt instrument, maturity date	[6]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.493%
Debt instrument, maturity date	[7]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Mar. 23, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.493%
Debt instrument, maturity date	[2]	Feb. 23, 2017
U.S. Treasury Bills 0.087% Due 01/07/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.087%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.087% Due 01/07/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]		0.087%
Debt instrument, maturity date	[8]		Jan. 06, 2016
U.S. Treasury Bills 0.165% Due 01/28/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.165%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.165% Due 01/28/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.165%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.165% Due 01/28/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.165%
Debt instrument, maturity date	[7]		Jan. 28, 2016
U.S. Treasury Bills 0.165% Due 01/28/16 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.165%
Debt instrument, maturity date	[2],[5]		Jan. 28, 2016
U.S. Treasury Bills 0.007% Due 02/04/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.007%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.00%
Debt instrument, maturity date	[2],[3]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.00%
Debt instrument, maturity date	[2],[5]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.00%
Debt instrument, maturity date	[2],[5]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.00%
Debt instrument, maturity date	[7]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 25, 2016
U.S. Treasury Bills 0.000% Due 02/25/16 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.190% Due 03/03/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.19%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.070% Due 03/10/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.07%
Debt instrument, maturity date	[2]		Mar. 10, 2016
U.S. Treasury Bills 0.070% Due 03/10/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.07%
Debt instrument, maturity date	[2],[4]		Mar. 10, 2016
U.S. Treasury Bills 0.201% Due 03/17/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.201%
Debt instrument, maturity date	[1],[2]		Mar. 17, 2016
U.S. Treasury Bills 0.060% Due 03/24/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.06%
Debt instrument, maturity date	[1],[2]		Mar. 24, 2016
U.S. Treasury Bills 0.366% Due 05/26/16 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.366%
Debt instrument, maturity date	[1],[2]		May 26, 2016
U.S. Treasury Bills 0.366% Due 05/26/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.366%
Debt instrument, maturity date	[1],[2]		May 26, 2016
U.S. Treasury Bills 0.366% Due 05/26/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.366%
Debt instrument, maturity date	[2],[5]		May 26, 2016
U.S. Treasury Bills 0.281% Due 01/05/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.281%
Debt instrument, maturity date	[2]	Jan. 05, 2017
U.S. Treasury Bills 0.390% Due 01/12/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.39%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.299% Due 01/19/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.299%
Debt instrument, maturity date	[2]	Jan. 19, 2017
U.S. Treasury Bills 0.299% Due 01/19/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.299%
Debt instrument, maturity date	[2],[5]	Jan. 19, 2017
U.S. Treasury Bills 0.311% Due 01/26/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.311%
Debt instrument, maturity date	[2]	Jan. 26, 2017
U.S. Treasury Bills 0.311% Due 01/26/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.311%
Debt instrument, maturity date	[7]	Jan. 26, 2017
U.S. Treasury Bills 0.311% Due 01/26/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.311%
Debt instrument, maturity date	[2],[5]	Jan. 26, 2017
U.S. Treasury Bills 0.411% Due 02/02/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.411%
Debt instrument, maturity date	[2]	Feb. 02, 2017
U.S. Treasury Bills 0.372% Due 02/09/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.372%
Debt instrument, maturity date	[1],[2]	Feb. 09, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.491%
Debt instrument, maturity date	[1],[2]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.491%
Debt instrument, maturity date	[1],[2]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.491%
Debt instrument, maturity date	[2],[4]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.491%
Debt instrument, maturity date	[2],[4]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.491%
Debt instrument, maturity date	[2]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.491%
Debt instrument, maturity date	[2],[5]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.491%
Debt instrument, maturity date	[2],[5]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.491%
Debt instrument, maturity date	[6],[9]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.491%
Debt instrument, maturity date	[7]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.491%
Debt instrument, maturity date	[2],[4]	Feb. 23, 2017
U.S. Treasury Bills 0.491% Due 02/23/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.491%
Debt instrument, maturity date	[2],[4]	Feb. 23, 2017
U.S. Treasury Bills 0.019% Due 02/04/16 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.019%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.209% Due 03/03/16 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.209%
Debt instrument, maturity date	[1],[2]		Mar. 03, 2016
U.S. Treasury Bills 0.471% Due 02/09/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.471%
Debt instrument, maturity date	[2]	Feb. 09, 2017
U.S. Treasury Bills 0.437% Due 02/16/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.437%
Debt instrument, maturity date	[1],[2]	Feb. 16, 2017
U.S. Treasury Bills 0.065% Due 01/07/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.065%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.053% Due 01/14/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.053%
Debt instrument, maturity date	[2]		Jan. 14, 2016
U.S. Treasury Bills 0.000% Due 01/21/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.000% Due 01/21/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.000% Due 01/21/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.000% Due 01/21/16 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.00%
Debt instrument, maturity date	[2],[5]		Jan. 21, 2016
U.S. Treasury Bills 0.035% Due 02/04/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.035%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.035% Due 02/04/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.035%
Debt instrument, maturity date	[7]		Feb. 04, 2016
U.S. Treasury Bills 0.035% Due 02/04/16 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.035%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.036% Due 02/11/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.036%
Debt instrument, maturity date	[2]		Feb. 11, 2016
U.S. Treasury Bills 0.208% Due 03/03/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.208%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.208% Due 03/03/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.208%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.208% Due 03/03/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.208%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.208% Due 03/03/16 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.208%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.194% Due 03/17/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.194%
Debt instrument, maturity date	[2]		Mar. 17, 2016
U.S. Treasury Bills 0.206% Due 03/24/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.206%
Debt instrument, maturity date	[2]		Mar. 24, 2016
U.S. Treasury Bills 0.364% Due 05/26/16 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.364%
Debt instrument, maturity date	[1],[2]		May 26, 2016
U.S. Treasury Bills 0.294% Due 01/05/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.294%
Debt instrument, maturity date	[2]	Jan. 05, 2017
U.S. Treasury Bills 0.307% Due 01/12/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.307%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.336% Due 01/19/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.336%
Debt instrument, maturity date	[1],[2]	Jan. 19, 2017
U.S. Treasury Bills 0.319% Due 01/26/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.319%
Debt instrument, maturity date	[1],[2]	Jan. 26, 2017
U.S. Treasury Bills 0.342% Due 02/02/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.342%
Debt instrument, maturity date	[1],[2]	Feb. 02, 2017
U.S. Treasury Bills 0.442% Due 02/09/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.442%
Debt instrument, maturity date	[1],[2]	Feb. 09, 2017
U.S. Treasury Bills 0.435% Due 02/16/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	0.435%
Debt instrument, maturity date	[1],[2]	Feb. 16, 2017
U.S. Treasury Bills 0.000% Due 01/07/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.000% Due 01/07/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.000% Due 01/14/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.00%
Debt instrument, maturity date	[2]		Jan. 14, 2016
U.S. Treasury Bills 0.055% Due 01/28/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.055%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.055% Due 01/28/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.055%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.130% Due 02/04/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.13%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.150% Due 02/11/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.15%
Debt instrument, maturity date	[2]		Feb. 11, 2016
U.S. Treasury Bills 0.150% Due 02/11/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.15%
Debt instrument, maturity date	[2]		Feb. 11, 2016
U.S. Treasury Bills 0.150% Due 02/11/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.15%
Debt instrument, maturity date	[2]		Feb. 11, 2016
U.S. Treasury Bills 0.129% Due 02/18/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.129%
Debt instrument, maturity date	[2]		Feb. 18, 2016
U.S. Treasury Bills 0.125% Due 02/25/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.125%
Debt instrument, maturity date	[2]		Feb. 25, 2016
U.S. Treasury Bills 0.181% Due 03/03/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.181%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.066% Due 03/10/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.066%
Debt instrument, maturity date	[1],[2]		Mar. 10, 2016
U.S. Treasury Bills 0.207% Due 03/17/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.207%
Debt instrument, maturity date	[1],[2]		Mar. 17, 2016
U.S. Treasury Bills 0.101% Due 03/24/16 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.101%
Debt instrument, maturity date	[1],[2]		Mar. 24, 2016
U.S. Treasury Bills 0.080% Due 01/07/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.08%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.080% Due 01/07/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.08%
Debt instrument, maturity date	[2]		Jan. 07, 2016
U.S. Treasury Bills 0.080% Due 01/07/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.08%
Debt instrument, maturity date	[7]		Jan. 07, 2016
U.S. Treasury Bills 0.020% Due 01/21/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.02%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.026% Due 02/04/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.026%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.180% Due 02/18/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.18%
Debt instrument, maturity date	[2],[3]		Feb. 18, 2016
U.S. Treasury Bills 0.180% Due 02/18/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.18%
Debt instrument, maturity date	[2]		Feb. 18, 2016
U.S. Treasury Bills 0.200% Due 03/10/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.20%
Debt instrument, maturity date	[2],[3]		Mar. 10, 2016
U.S. Treasury Bills 0.200% Due 03/10/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.20%
Debt instrument, maturity date	[2]		Mar. 10, 2016
U.S. Treasury Bills 0.200% Due 03/10/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.20%
Debt instrument, maturity date	[8],[9]		Mar. 10, 2016
U.S. Treasury Bills 0.200% Due 03/10/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.20%
Debt instrument, maturity date	[7]		Mar. 10, 2016
U.S. Treasury Bills 0.200% Due 03/10/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.20%
Debt instrument, maturity date	[2]		Mar. 10, 2016
U.S. Treasury Bills 0.172% Due 03/17/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.172%
Debt instrument, maturity date	[2],[3]		Mar. 17, 2016
U.S. Treasury Bills 0.176% Due 03/24/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.176%
Debt instrument, maturity date	[2],[3]		Mar. 24, 2016
U.S. Treasury Bills 0.353% Due 05/26/16 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]		0.353%
Debt instrument, maturity date	[2],[3]		May 26, 2016
U.S. Treasury Bills 0.353% Due 05/26/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.353%
Debt instrument, maturity date	[2],[4]		May 26, 2016
U.S. Treasury Bills 0.353% Due 05/26/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.353%
Debt instrument, maturity date	[2],[5]		May 26, 2016
U.S. Treasury Bills 0.353% Due 05/26/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.353%
Debt instrument, maturity date	[2],[4]		May 26, 2016
U.S. Treasury Bills 0.281% Due 01/05/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.281%
Debt instrument, maturity date	[2],[3]	Jan. 05, 2017
U.S. Treasury Bills 0.353% Due 01/12/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.353%
Debt instrument, maturity date	[2],[3]	Jan. 12, 2017
U.S. Treasury Bills 0.344% Due 01/19/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.344%
Debt instrument, maturity date	[2],[3]	Jan. 19, 2017
U.S. Treasury Bills 0.395% Due 01/26/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.395%
Debt instrument, maturity date	[2],[3]	Jan. 26, 2017
U.S. Treasury Bills 0.406% Due 02/02/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.406%
Debt instrument, maturity date	[2]	Feb. 02, 2017
U.S. Treasury Bills 0.406% Due 02/02/17 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.406%
Debt instrument, maturity date	[2]	Feb. 02, 2017
U.S. Treasury Bills 0.441% Due 02/09/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.441%
Debt instrument, maturity date	[2],[3]	Feb. 09, 2017
U.S. Treasury Bills 0.458% Due 03/02/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.458%
Debt instrument, maturity date	[2],[3]	Mar. 02, 2017
U.S. Treasury Bills 0.516% Due 03/30/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[3]	0.516%
Debt instrument, maturity date	[2],[3]	Mar. 30, 2017
U.S. Treasury Bills 0.233% Due 03/17/16 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.233%
Debt instrument, maturity date	[2]		Mar. 17, 2016
U.S. Treasury Bills 0.185% Due 03/24/16 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.185%
Debt instrument, maturity date	[2]		Mar. 24, 2016
U.S. Treasury Bills 0.386% Due 05/26/16 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.386%
Debt instrument, maturity date	[2]		May 26, 2016
U.S. Treasury Bills 0.386% Due 05/26/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.386%
Debt instrument, maturity date	[2],[4]		May 26, 2016
U.S. Treasury Bills 0.343% Due 01/26/17 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.343%
Debt instrument, maturity date	[2]	Jan. 26, 2017
U.S. Treasury Bills 0.135% Due 01/07/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.135%
Debt instrument, maturity date	[2],[4]		Jan. 07, 2016
U.S. Treasury Bills 0.135% Due 01/07/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.135%
Debt instrument, maturity date	[2],[4]		Jan. 07, 2016
U.S. Treasury Bills 0.135% Due 01/07/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.135%
Debt instrument, maturity date	[2],[4]		Jan. 07, 2016
U.S. Treasury Bills 0.135% Due 01/07/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.135%
Debt instrument, maturity date	[2],[4]		Jan. 07, 2016
U.S. Treasury Bills 0.040% Due 01/14/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.04%
Debt instrument, maturity date	[2],[4]		Jan. 14, 2016
U.S. Treasury Bills 0.040% Due 01/14/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]		0.04%
Debt instrument, maturity date	[8]		Jan. 14, 2016
U.S. Treasury Bills 0.040% Due 01/14/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.04%
Debt instrument, maturity date	[2]		Jan. 14, 2016
U.S. Treasury Bills 0.043% Due 01/21/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.043%
Debt instrument, maturity date	[2],[4]		Jan. 21, 2016
U.S. Treasury Bills 0.043% Due 01/21/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.043%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.043% Due 01/21/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.043%
Debt instrument, maturity date	[2]		Jan. 21, 2016
U.S. Treasury Bills 0.210% Due 03/03/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.21%
Debt instrument, maturity date	[2]		Mar. 03, 2016
U.S. Treasury Bills 0.181% Due 03/17/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.181%
Debt instrument, maturity date	[2],[4]		Mar. 17, 2016
U.S. Treasury Bills 0.181% Due 03/17/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.181%
Debt instrument, maturity date	[2],[4]		Mar. 17, 2016
U.S. Treasury Bills 0.181% Due 03/17/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.181%
Debt instrument, maturity date	[2]		Mar. 17, 2016
U.S. Treasury Bills 0.181% Due 03/17/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.181%
Debt instrument, maturity date	[2],[5]		Mar. 17, 2016
U.S. Treasury Bills 0.203% Due 03/24/16 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.203%
Debt instrument, maturity date	[2],[4]		Mar. 24, 2016
U.S. Treasury Bills 0.203% Due 03/24/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.203%
Debt instrument, maturity date	[2]		Mar. 24, 2016
U.S. Treasury Bills 0.435% Due 01/12/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.435%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.435% Due 01/12/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.435%
Debt instrument, maturity date	[7]	Jan. 12, 2017
U.S. Treasury Bills 0.308% Due 01/19/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.308%
Debt instrument, maturity date	[2],[4]	Jan. 19, 2017
U.S. Treasury Bills 0.371% Due 01/26/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.371%
Debt instrument, maturity date	[2]	Jan. 26, 2017
U.S. Treasury Bills 0.371% Due 01/26/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.371%
Debt instrument, maturity date	[2]	Jan. 26, 2017
U.S. Treasury Bills 0.371% Due 01/26/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.371%
Debt instrument, maturity date	[2]	Jan. 26, 2017
U.S. Treasury Bills 0.407% Due 02/02/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.407%
Debt instrument, maturity date	[2]	Feb. 02, 2017
U.S. Treasury Bills 0.406% Due 02/16/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.406%
Debt instrument, maturity date	[2],[4]	Feb. 16, 2017
U.S. Treasury Bills 0.481% Due 03/09/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.481%
Debt instrument, maturity date	[2],[4]	Mar. 09, 2017
U.S. Treasury Bills 0.000% Due 02/11/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 11, 2016
U.S. Treasury Bills 0.138% Due 02/18/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.138%
Debt instrument, maturity date	[2],[4]		Feb. 18, 2016
U.S. Treasury Bills 0.163% Due 03/24/16 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.163%
Debt instrument, maturity date	[2],[4]		Mar. 24, 2016
U.S. Treasury Bills 0.339% Due 01/12/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.339%
Debt instrument, maturity date	[2],[4]	Jan. 12, 2017
U.S. Treasury Bills 0.455% Due 01/19/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.455%
Debt instrument, maturity date	[2]	Jan. 19, 2017
U.S. Treasury Bills 0.452% Due 02/09/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.452%
Debt instrument, maturity date	[2],[4]	Feb. 09, 2017
U.S. Treasury Bills 0.452% Due 02/09/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.452%
Debt instrument, maturity date	[2],[5]	Feb. 09, 2017
U.S. Treasury Bills 0.027% Due 02/04/16 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.027%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.027% Due 02/04/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.027%
Debt instrument, maturity date	[2],[5]		Feb. 04, 2016
U.S. Treasury Bills 0.270% Due 01/12/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.27%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.270% Due 01/12/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.27%
Debt instrument, maturity date	[6],[9]	Jan. 12, 2017
U.S. Treasury Bills 0.270% Due 01/12/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.27%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.270% Due 01/12/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.27%
Debt instrument, maturity date	[2]	Jan. 12, 2017
U.S. Treasury Bills 0.355% Due 01/19/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.355%
Debt instrument, maturity date	[2]	Jan. 19, 2017
U.S. Treasury Bills 0.355% Due 01/19/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.355%
Debt instrument, maturity date	[2],[4]	Jan. 19, 2017
U.S. Treasury Bills 0.048% Due 02/04/16 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.048%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.151% Due 03/03/16 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.151%
Debt instrument, maturity date	[1],[2]		Mar. 03, 2016
U.S. Treasury Bills 0.151% Due 03/03/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.151%
Debt instrument, maturity date	[7]		Mar. 03, 2016
U.S. Treasury Bills 0.156% Due 03/24/16 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]		0.156%
Debt instrument, maturity date	[1],[2]		Mar. 24, 2016
U.S. Treasury Bills 0.326% Due 01/19/17 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.326%
Debt instrument, maturity date	[2]	Jan. 19, 2017
U.S. Treasury Bills 0.286% Due 01/05/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[5]	0.286%
Debt instrument, maturity date	[5]	Jan. 05, 2017
U.S. Treasury Bills 0.286% Due 01/05/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.286%
Debt instrument, maturity date	[2],[5]	Jan. 05, 2017
U.S. Treasury Bills 0.421% Due 01/12/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[5]	0.421%
Debt instrument, maturity date	[5]	Jan. 12, 2017
U.S. Treasury Bills 0.342% Due 01/19/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.342%
Debt instrument, maturity date	[2]	Jan. 19, 2017
U.S. Treasury Bills 0.350% Due 01/26/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.35%
Debt instrument, maturity date	[2],[5]	Jan. 26, 2017
U.S. Treasury Bills 0.391% Due 02/02/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.391%
Debt instrument, maturity date	[2],[5]	Feb. 02, 2017
U.S. Treasury Bills 0.471% Due 02/09/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.471%
Debt instrument, maturity date	[2]	Feb. 09, 2017
U.S. Treasury Bills 0.133% Due 01/28/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.133%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.167% Due 03/03/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.167%
Debt instrument, maturity date	[2],[5]		Mar. 03, 2016
U.S. Treasury Bills 0.175% Due 03/24/16 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.175%
Debt instrument, maturity date	[2],[5]		Mar. 24, 2016
U.S. Treasury Bills 0.148% Due 01/14/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.148%
Debt instrument, maturity date	[2]		Jan. 14, 2016
U.S. Treasury Bills 0.110% Due 01/28/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.11%
Debt instrument, maturity date	[2]		Jan. 18, 2016
U.S. Treasury Bills 0.110% Due 01/28/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.11%
Debt instrument, maturity date	[2]		Jan. 28, 2016
U.S. Treasury Bills 0.013% Due 02/04/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.013%
Debt instrument, maturity date	[2]		Feb. 04, 2016
U.S. Treasury Bills 0.152% Due 03/24/16 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.152%
Debt instrument, maturity date	[2],[5]		Mar. 24, 2016
U.S. Treasury Bills 0.343% Due 01/12/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.343%
Debt instrument, maturity date	[2],[5]	Jan. 12, 2017
U.S. Treasury Bills 0.405% Due 01/19/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.405%
Debt instrument, maturity date	[2],[5]	Jan. 19, 2017
U.S. Treasury Bills 0.346% Due 01/26/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.346%
Debt instrument, maturity date	[2],[5]	Jan. 26, 2017
U.S. Treasury Bills 0.390% Due 02/02/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.39%
Debt instrument, maturity date	[2],[5]	Feb. 02, 2017
U.S. Treasury Bills 0.393% Due 02/16/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]	0.393%
Debt instrument, maturity date	[2]	Feb. 16, 2017
U.S. Treasury Bills 0.393% Due 02/16/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.393%
Debt instrument, maturity date	[2],[4]	Feb. 16, 2017
U.S. Treasury Bills 0.289% Due 01/05/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.289%
Debt instrument, maturity date	[6],[9]	Jan. 05, 2017
U.S. Treasury Bills 0.371% Due 01/19/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.371%
Debt instrument, maturity date	[6],[9]	Jan. 19, 2017
U.S. Treasury Bills 0.362% Due 01/26/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.362%
Debt instrument, maturity date	[6],[9]	Jan. 26, 2017
U.S. Treasury Bills 0.418% Due 02/02/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.418%
Debt instrument, maturity date	[6],[9]	Feb. 02, 2017
U.S. Treasury Bills 0.400% Due 02/09/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.40%
Debt instrument, maturity date	[6],[9]	Feb. 09, 2017
U.S. Treasury Bills 0.420% Due 02/16/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.42%
Debt instrument, maturity date	[6],[9]	Feb. 16, 2017
U.S. Treasury Bills 0.481% Due 03/09/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[9]	0.481%
Debt instrument, maturity date	[6],[9]	Mar. 09, 2017
U.S. Treasury Bills 0.001% Due 01/21/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]		0.001%
Debt instrument, maturity date	[8]		Jan. 21, 2016
U.S. Treasury Bills 0.001% Due 01/21/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.001%
Debt instrument, maturity date	[2],[4]		Jan. 21, 2016
U.S. Treasury Bills 0.094% Due 01/28/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.094%
Debt instrument, maturity date	[8],[9]		Jan. 28, 2016
U.S. Treasury Bills 0.025% Due 02/04/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]		0.025%
Debt instrument, maturity date	[8]		Feb. 04, 2016
U.S. Treasury Bills 0.005% Due 02/11/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.005%
Debt instrument, maturity date	[8],[9]		Feb. 11, 2016
U.S. Treasury Bills 0.119% Due 02/18/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.119%
Debt instrument, maturity date	[8],[9]		Feb. 18, 2016
U.S. Treasury Bills 0.013% Due 02/25/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.013%
Debt instrument, maturity date	[8],[9]		Feb. 25, 2016
U.S. Treasury Bills 0.202% Due 03/03/16[Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.202%
Debt instrument, maturity date	[8],[9]		Mar. 03, 2016
U.S. Treasury Bills 0.147% Due 03/17/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.147%
Debt instrument, maturity date	[8],[9]		Mar. 17, 2016
U.S. Treasury Bills 0.178% Due 03/24/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.178%
Debt instrument, maturity date	[8],[9]		Jan. 24, 2016
U.S. Treasury Bills 0.356% Due 05/26/16 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8],[9]		0.356%
Debt instrument, maturity date	[8],[9]		May 26, 2016
U.S. Treasury Bills 0.356% Due 05/26/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.356%
Debt instrument, maturity date	[2],[4]		May 26, 2016
U.S. Treasury Bills 0.345% Due 01/19/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.345%
Debt instrument, maturity date	[7]	Jan. 19, 2017
U.S. Treasury Bills 0.403% Due 02/02/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.403%
Debt instrument, maturity date	[7]	Feb. 02, 2017
U.S. Treasury Bills 0.425% Due 02/09/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.425%
Debt instrument, maturity date	[7]	Feb. 09, 2017
U.S. Treasury Bills 0.440% Due 02/16/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]	0.44%
Debt instrument, maturity date	[7]	Feb. 16, 2017
U.S. Treasury Bills 0.186% Due 03/24/16 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[7]		0.186%
Debt instrument, maturity date	[7]		Mar. 24, 2016
U.S. Treasury Bills 0.000% Due 02/04/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.00%
Debt instrument, maturity date	[2],[4]		Feb. 04, 2016
U.S. Treasury Bills 0.240% Due 03/17/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.24%
Debt instrument, maturity date	[2]		Mar. 17, 2016
U.S. Treasury Bills 0.184% Due 03/24/16 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.184%
Debt instrument, maturity date	[2],[4]		Mar. 24, 2016
U.S. Treasury Bills 0.318% Due 01/05/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.318%
Debt instrument, maturity date	[2],[4]	Jan. 05, 2017
U.S. Treasury Bills 0.318% Due 01/05/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.318%
Debt instrument, maturity date	[2],[4]	Jan. 05, 2017
U.S. Treasury Bills 0.276% Due 01/12/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.276%
Debt instrument, maturity date	[2],[4]	Jan. 12, 2017
U.S. Treasury Bills 0.360% Due 01/26/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.36%
Debt instrument, maturity date	[2],[4]	Jan. 26, 2017
U.S. Treasury Bills 0.406% Due 02/02/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.406%
Debt instrument, maturity date	[2],[4]	Feb. 02, 2017
U.S. Treasury Bills 0.493% Due 03/23/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.493%
Debt instrument, maturity date	[2],[4]	Mar. 23, 2017
U.S. Treasury Bills 0.039% Due 02/04/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.039%
Debt instrument, maturity date	[2],[4]		Feb. 04, 2016
U.S. Treasury Bills 0.115% Due 02/18/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2]		0.115%
Debt instrument, maturity date	[2]		Feb. 18, 2016
U.S. Treasury Bills 0.199% Due 03/03/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.199%
Debt instrument, maturity date	[2],[4]		Mar. 03, 2016
U.S. Treasury Bills 0.180% Due 03/24/16 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]		0.18%
Debt instrument, maturity date	[2],[4]		Mar. 24, 2016
U.S. Treasury Bills 0.354% Due 01/12/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.354%
Debt instrument, maturity date	[2],[4]	Jan. 12, 2017
U.S. Treasury Bills 0.339% Due 01/19/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.339%
Debt instrument, maturity date	[2],[4]	Jan. 19, 2017
U.S. Treasury Bills 0.394% Due 02/02/17 [December] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.394%
Debt instrument, maturity date	[2],[4]	Feb. 02, 2017
U.S. Treasury Bills 0.452% Due 02/09/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.452%
Debt instrument, maturity date	[2],[4]	Feb. 09, 2017
U.S. Treasury Bills 0.423% Due 02/16/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[4]	0.423%
Debt instrument, maturity date	[2],[4]	Feb. 16, 2017
U.S. Treasury Bills 0.166% Due 03/24/16 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]		0.166%
Debt instrument, maturity date	[2],[5]		Mar. 24, 2016
U.S. Treasury Bills 0.295% Due 01/05/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.295%
Debt instrument, maturity date	[2],[5]	Jan. 05, 2017
U.S. Treasury Bills 0.210% Due 01/05/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[2],[5]	0.21%
Debt instrument, maturity date	[2],[5]	Jan. 05, 2017

[1] All or partial amount pledged as collateral for futures contracts.

[2] Rates shown represents discount rate at the time of purchase.

[3] All or partial amount pledged as collateral for swap agreements and/or futures contracts.

[4] All or partial amount pledged as collateral for forward agreements and/or futures contracts.

[5] All or partial amount pledged as collateral for foreign currency forward contracts.

[6] Rates shown represents discount rate at the time of purchase.

[7] Rates shown represents discount rate at the time of the purchase.

[8] Rates shown represents discount rate at the time of the purchase.

[9] All or partial amount pledged as collateral for swap agreements and/or futures contracts.