|
Investments (Financial Assets, Derivative Assets, And Collateral Held By Counterparty) (Detail) (USD $)
|
Mar. 31, 2013
|
Dec. 31, 2012
|
|
ProShares UltraShort DJ-UBS Commodity [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
$ 148,502 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
148,502 |
|
ProShares UltraShort DJ-UBS Commodity [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
104,181 |
| Net Amount |
|
104,181 |
|
ProShares UltraShort DJ-UBS Commodity [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
44,321 |
| Net Amount |
|
44,321 |
|
ProShares UltraShort DJ-UBS Crude Oil [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
|
|
ProShares UltraShort DJ-UBS Natural Gas [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
442,358 |
632,777 |
| Net Amount |
442,358 |
632,777 |
|
ProShares UltraShort DJ-UBS Natural Gas [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
442,358 |
632,777 |
| Net Amount |
442,358 |
632,777 |
|
ProShares UltraShort Gold [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,300 |
3,729,856 |
| Net Amount |
2,300 |
3,729,856 |
|
ProShares UltraShort Gold [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,300 |
|
| Net Amount |
2,300 |
|
|
ProShares UltraShort Gold [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
2,389,236 |
| Net Amount |
|
2,389,236 |
|
ProShares UltraShort Gold [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
452,059 |
| Net Amount |
|
452,059 |
|
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
499,264 |
| Net Amount |
|
499,264 |
|
ProShares UltraShort Gold [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
389,297 |
| Net Amount |
|
389,297 |
|
ProShares UltraShort Silver [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
269,491 |
19,307,685 |
| Net Amount |
269,491 |
19,307,685 |
|
ProShares UltraShort Silver [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,890 |
|
| Net Amount |
2,890 |
|
|
ProShares UltraShort Silver [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
55,643 |
10,786,801 |
| Net Amount |
55,643 |
10,786,801 |
|
ProShares UltraShort Silver [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
63,340 |
3,141,119 |
| Net Amount |
63,340 |
3,141,119 |
|
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
147,618 |
3,255,649 |
| Net Amount |
147,618 |
3,255,649 |
|
ProShares UltraShort Silver [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
2,124,116 |
| Net Amount |
|
2,124,116 |
|
ProShares Short Euro [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
6,612 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
6,612 |
|
ProShares Short Euro [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
6,612 |
| Net Amount |
|
6,612 |
|
ProShares UltraShort Australian Dollar [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
21,300 |
|
| Net Amount |
21,300 |
|
|
ProShares UltraShort Australian Dollar [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
21,300 |
|
| Net Amount |
21,300 |
|
|
ProShares UltraShort Euro [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
15,104,660 |
251,047 |
| Net Amount |
15,104,660 |
251,047 |
|
ProShares UltraShort Euro [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
7,182,101 |
251,047 |
| Net Amount |
7,182,101 |
251,047 |
|
ProShares UltraShort Euro [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
7,922,559 |
|
| Net Amount |
7,922,559 |
|
|
ProShares UltraShort Yen [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,732,626 |
38,346,817 |
| Net Amount |
2,732,626 |
38,346,817 |
|
ProShares UltraShort Yen [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
1,222,105 |
18,518,532 |
| Net Amount |
1,222,105 |
18,518,532 |
|
ProShares UltraShort Yen [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
1,510,521 |
19,828,285 |
| Net Amount |
1,510,521 |
19,828,285 |
|
ProShares Ultra DJ-UBS Commodity [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
115,047 |
|
| Net Amount |
115,047 |
|
|
ProShares Ultra DJ-UBS Commodity [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
63,644 |
|
| Net Amount |
63,644 |
|
|
ProShares Ultra DJ-UBS Commodity [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
51,403 |
|
| Net Amount |
51,403 |
|
|
ProShares Ultra DJ-UBS Crude Oil [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
27,579,874 |
36,764,035 |
| Net Amount |
27,579,874 |
36,764,035 |
|
ProShares Ultra DJ-UBS Crude Oil [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,386,303 |
3,430,415 |
| Net Amount |
2,386,303 |
3,430,415 |
|
ProShares Ultra DJ-UBS Crude Oil [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
8,318,017 |
14,334,730 |
| Net Amount |
8,318,017 |
14,334,730 |
|
ProShares Ultra DJ-UBS Crude Oil [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
4,601,585 |
8,989,866 |
| Net Amount |
4,601,585 |
8,989,866 |
|
ProShares Ultra DJ-UBS Crude Oil [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
12,273,969 |
10,009,024 |
| Net Amount |
12,273,969 |
10,009,024 |
|
ProShares Ultra DJ-UBS Natural Gas [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
|
|
ProShares Ultra Gold [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
9,222,440 |
3,980 |
| Net Amount |
9,222,440 |
3,980 |
|
ProShares Ultra Gold [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
3,980 |
| Net Amount |
|
3,980 |
|
ProShares Ultra Gold [Member] | Deutsche Bank AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
4,465,287 |
|
| Net Amount |
4,465,287 |
|
|
ProShares Ultra Gold [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
1,574,862 |
|
| Net Amount |
1,574,862 |
|
|
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
1,671,035 |
|
| Net Amount |
1,671,035 |
|
|
ProShares Ultra Gold [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
1,511,256 |
|
| Net Amount |
1,511,256 |
|
|
ProShares Ultra Silver [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
2,520 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
2,520 |
|
ProShares Ultra Silver [Member] | Goldman Sachs & Co.Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
2,520 |
| Net Amount |
|
2,520 |
|
ProShares Ultra Australian Dollar [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
12,000 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
12,000 |
|
ProShares Ultra Australian Dollar [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
12,000 |
| Net Amount |
|
12,000 |
|
ProShares Ultra Euro [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
3,138 |
89,473 |
| Net Amount |
3,138 |
89,473 |
|
ProShares Ultra Euro [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
737 |
38,327 |
| Net Amount |
737 |
38,327 |
|
ProShares Ultra Euro [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
2,401 |
51,146 |
| Net Amount |
2,401 |
51,146 |
|
ProShares Ultra Yen [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
13,523 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
13,523 |
|
ProShares Ultra Yen [Member] | Goldman Sachs International (Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
7,325 |
| Net Amount |
|
7,325 |
|
ProShares Ultra Yen [Member] | UBS AG [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
6,198 |
| Net Amount |
|
6,198 |
|
ProShares VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
|
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
|
|
ProShares VIX Mid-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
211,350 |
|
| Net Amount |
211,350 |
|
|
ProShares VIX Mid-Term Futures ETF [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
211,350 |
|
| Net Amount |
211,350 |
|
|
ProShares Ultra VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
301,351 |
| Financial Instruments |
|
|
| Cash Collateral Received |
|
|
| Net Amount |
|
301,351 |
|
ProShares Ultra VIX Short-Term Futures ETF [Member] | Societe Generale S.A. [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
|
301,351 |
| Net Amount |
|
301,351 |
|
ProShares Short VIX Short-Term Futures ETF [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
472,022 |
5,524,721 |
| Net Amount |
472,022 |
5,524,721 |
|
ProShares Short VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
|
|
|
| Derivative [Line Items] |
|
|
| Net Amounts of Assets Presented in the Statement of Financial Condition |
472,022 |
5,524,721 |
| Net Amount |
$ 472,022 |
$ 5,524,721 |