|
Investments (Financial Liabilities, Derivative Liabilities, And Collateral Pledged By Counterparty) (Detail) (USD $)
|
Mar. 31, 2013
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Dec. 31, 2012
|
|
ProShares UltraShort DJ-UBS Commodity [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
$ 92,919 |
|
| Financial Instruments |
(92,919) |
|
|
ProShares UltraShort DJ-UBS Commodity [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
64,434 |
|
| Financial Instruments |
(64,434) |
|
|
ProShares UltraShort DJ-UBS Commodity [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
28,485 |
|
| Financial Instruments |
(28,485) |
|
|
ProShares UltraShort DJ-UBS Crude Oil [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
12,719,387 |
6,586,396 |
| Financial Instruments |
(11,368,414) |
(5,607,060) |
| Cash Collateral Pledged |
(1,350,973) |
(979,336) |
|
ProShares UltraShort DJ-UBS Crude Oil [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
6,252,210 |
1,880,292 |
| Financial Instruments |
(6,252,210) |
(1,880,292) |
|
ProShares UltraShort DJ-UBS Crude Oil [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
3,986,152 |
1,996,402 |
| Financial Instruments |
(3,986,152) |
(1,996,402) |
|
ProShares UltraShort DJ-UBS Crude Oil [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,350,973 |
979,336 |
| Cash Collateral Pledged |
(1,350,973) |
(979,336) |
|
ProShares UltraShort DJ-UBS Crude Oil [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,130,052 |
1,730,366 |
| Financial Instruments |
(1,130,052) |
(1,730,366) |
|
ProShares UltraShort DJ-UBS Natural Gas [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Pledged |
|
|
| Net Amount |
|
|
|
ProShares UltraShort Gold [Member]
|
|
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| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
3,246,282 |
3,980 |
| Financial Instruments |
(3,246,282) |
|
| Cash Collateral Pledged |
|
(3,980) |
|
ProShares UltraShort Gold [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
589,404 |
|
| Financial Instruments |
(589,404) |
|
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ProShares UltraShort Gold [Member] | UBS AG [Member]
|
|
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| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
444,201 |
|
| Financial Instruments |
(444,201) |
|
|
ProShares UltraShort Gold [Member] | Goldman Sachs & Co.Member]
|
|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
3,980 |
| Cash Collateral Pledged |
|
(3,980) |
|
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
460,599 |
|
| Financial Instruments |
(460,599) |
|
|
ProShares UltraShort Gold [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,752,078 |
|
| Financial Instruments |
(1,752,078) |
|
|
ProShares UltraShort Silver [Member]
|
|
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| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
11,313 |
2,520 |
| Financial Instruments |
(11,313) |
|
| Cash Collateral Pledged |
|
(2,520) |
|
ProShares UltraShort Silver [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
11,313 |
|
| Financial Instruments |
(11,313) |
|
|
ProShares UltraShort Silver [Member] | Goldman Sachs & Co.Member]
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|
|
| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
2,520 |
| Cash Collateral Pledged |
|
(2,520) |
|
ProShares Short Euro [Member]
|
|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
12,300 |
|
| Cash Collateral Pledged |
(12,300) |
|
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ProShares Short Euro [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
12,300 |
|
| Cash Collateral Pledged |
(12,300) |
|
|
ProShares UltraShort Australian Dollar [Member]
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|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
10,950 |
| Financial Instruments |
|
|
| Cash Collateral Pledged |
|
(10,950) |
| Net Amount |
|
|
|
ProShares UltraShort Australian Dollar [Member] | RBC Capital Markets [Member]
|
|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
10,950 |
| Cash Collateral Pledged |
|
(10,950) |
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ProShares UltraShort Euro [Member]
|
|
|
| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,439,211 |
13,398,619 |
| Financial Instruments |
(1,439,211) |
(13,398,619) |
|
ProShares UltraShort Euro [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
930,513 |
6,048,832 |
| Financial Instruments |
(930,513) |
(6,048,832) |
|
ProShares UltraShort Euro [Member] | UBS AG [Member]
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|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
508,698 |
7,349,787 |
| Financial Instruments |
(508,698) |
(7,349,787) |
|
ProShares UltraShort Yen [Member]
|
|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
232,642 |
| Financial Instruments |
|
(232,642) |
| Cash Collateral Pledged |
|
|
| Net Amount |
|
|
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ProShares UltraShort Yen [Member] | UBS AG [Member]
|
|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
232,642 |
| Financial Instruments |
|
(232,642) |
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ProShares Ultra DJ-UBS Commodity [Member]
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|
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| Derivative [Line Items] |
|
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| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
306,268 |
| Financial Instruments |
|
(306,268) |
| Cash Collateral Pledged |
|
|
| Net Amount |
|
|
|
ProShares Ultra DJ-UBS Commodity [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
198,117 |
| Financial Instruments |
|
(198,117) |
|
ProShares Ultra DJ-UBS Commodity [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
108,151 |
| Financial Instruments |
|
(108,151) |
|
ProShares Ultra DJ-UBS Crude Oil [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Pledged |
|
|
| Net Amount |
|
|
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ProShares Ultra DJ-UBS Natural Gas [Member]
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|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
834,689 |
4,891,783 |
| Cash Collateral Pledged |
(834,689) |
(4,891,783) |
|
ProShares Ultra DJ-UBS Natural Gas [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
834,689 |
4,891,783 |
| Cash Collateral Pledged |
(834,689) |
(4,891,783) |
|
ProShares Ultra Gold [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
2,300 |
15,652,058 |
| Financial Instruments |
|
(15,652,058) |
| Cash Collateral Pledged |
(2,300) |
|
|
ProShares Ultra Gold [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
3,678,367 |
| Financial Instruments |
|
(3,678,367) |
|
ProShares Ultra Gold [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
3,634,829 |
| Financial Instruments |
|
(3,634,829) |
|
ProShares Ultra Gold [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
2,300 |
|
| Cash Collateral Pledged |
(2,300) |
|
|
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
3,715,989 |
| Financial Instruments |
|
(3,715,989) |
|
ProShares Ultra Gold [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
4,622,873 |
| Financial Instruments |
|
(4,622,873) |
|
ProShares Ultra Silver [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
8,109,608 |
145,740,706 |
| Financial Instruments |
(8,106,718) |
(143,623,808) |
| Cash Collateral Pledged |
(2,890) |
|
| Net Amount |
|
2,116,898 |
|
ProShares Ultra Silver [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,237,902 |
34,491,042 |
| Financial Instruments |
(1,237,902) |
(34,491,042) |
|
ProShares Ultra Silver [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,005,386 |
31,574,331 |
| Financial Instruments |
(1,005,386) |
(31,574,331) |
|
ProShares Ultra Silver [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
2,890 |
|
| Cash Collateral Pledged |
(2,890) |
|
|
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
1,056,353 |
34,802,217 |
| Financial Instruments |
(1,056,353) |
(34,802,217) |
|
ProShares Ultra Silver [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
4,807,077 |
44,873,116 |
| Financial Instruments |
(4,807,077) |
(42,756,218) |
| Net Amount |
|
2,116,898 |
|
ProShares Ultra Australian Dollar [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
22,982 |
|
| Cash Collateral Pledged |
(22,982) |
|
|
ProShares Ultra Australian Dollar [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
22,982 |
|
| Cash Collateral Pledged |
(22,982) |
|
|
ProShares Ultra Euro [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
137,134 |
2,314 |
| Financial Instruments |
(137,134) |
(2,314) |
|
ProShares Ultra Euro [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
63,478 |
635 |
| Financial Instruments |
(63,478) |
(635) |
|
ProShares Ultra Euro [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
73,656 |
1,679 |
| Financial Instruments |
(73,656) |
(1,679) |
|
ProShares Ultra Yen [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
70,562 |
507,819 |
| Financial Instruments |
(70,562) |
(410,046) |
| Net Amount |
|
97,773 |
|
ProShares Ultra Yen [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
22,860 |
231,047 |
| Financial Instruments |
(22,860) |
(231,047) |
|
ProShares Ultra Yen [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
47,702 |
276,772 |
| Financial Instruments |
(47,702) |
(178,999) |
| Net Amount |
|
97,773 |
|
ProShares VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
2,471,348 |
31,540,181 |
| Cash Collateral Pledged |
(2,471,348) |
(31,540,181) |
|
ProShares VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
2,471,348 |
31,540,181 |
| Cash Collateral Pledged |
(2,471,348) |
(31,540,181) |
|
ProShares VIX Mid-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
1,890,675 |
| Financial Instruments |
|
|
| Cash Collateral Pledged |
|
(1,890,675) |
| Net Amount |
|
|
|
ProShares VIX Mid-Term Futures ETF [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
1,890,675 |
| Cash Collateral Pledged |
|
(1,890,675) |
|
ProShares Ultra VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
4,961,933 |
35,666,735 |
| Cash Collateral Pledged |
(4,961,933) |
(35,666,735) |
|
ProShares Ultra VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
4,961,933 |
35,666,735 |
| Cash Collateral Pledged |
(4,961,933) |
(35,666,735) |
|
ProShares Short VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Liabilities Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Pledged |
|
|
| Net Amount |
|
|