Subsequent Events	12 Months Ended
Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	NOTE 9 – SUBSEQUENT EVENTS Management has evaluated the possibility of subsequent events existing in the Trust’s and the Funds’ financial statements through the date the financial statements were issued. The subsequent events were as follows: On December 22, 2016, the Trust announced a 2-for-1 split of the shares of beneficial interest of ProShares UltraShort Bloomberg Crude Oil (NYSE Arca symbol “SCO”). The split was effective prior to the opening of trading on NYSE Arca on January 12, 2017. The split was effective for shareholders of record after the close of the markets on January 9, 2017 and payable after the close of the markets on January 11, 2017. The Fund traded at its post-split price on January 12, 2017. The ticker symbol for the Fund did not change, and the Fund continues to trade on NYSE Arca. The split was applied retroactively for all periods presented, increasing the number of shares outstanding for ProShares UltraShort Bloomberg Crude Oil, and resulted in a proportionate decrease in the price per share and per share information of ProShares UltraShort Bloomberg Crude Oil. Therefore, the split did not change the aggregate net asset value of a shareholder’s investment at the time of the split. On December 22, 2016, the Trust announced a 1-for-2 reverse split of the shares of beneficial interest of ProShares Ultra Bloomberg Crude Oil (NYSE Arca symbol “UCO”) and a 1-for-5 reverse split of the shares of beneficial interest of ProShares Ultra VIX Short-Term Futures ETF (NYSE Arca symbol “UVXY”). The reverse splits were effective prior to the opening of trading on NYSE Arca on January 12, 2017. The reverse splits were effective for shareholders at the market open on January 12, 2017, when the Funds traded at their post-split price. The ticker symbols for the Funds did not change, and each Fund was issued a new CUSIP numbers. The reverse splits were applied retroactively for all periods presented, reducing the number of shares outstanding for ProShares Ultra Bloomberg Crude Oil and ProShares Ultra VIX Short-Term Futures ETF, and resulted in a proportionate increase in the price per share and per share information of ProShares Ultra Bloomberg Crude Oil and ProShares Ultra VIX Short-Term Futures ETF. Therefore, the reverse splits did not change the aggregate net asset value of a shareholder’s investment at the time of the reverse splits.

NOTE 9 – SUBSEQUENT EVENTS

Management has evaluated the possibility of subsequent events existing in the Trust’s and the Funds’ financial statements through the date the financial statements were issued. The subsequent events were as follows:

On December 22, 2016, the Trust announced a 2-for-1 split of the shares of beneficial interest of ProShares UltraShort Bloomberg Crude Oil (NYSE Arca symbol “SCO”). The split was effective prior to the opening of trading on NYSE Arca on January 12, 2017.

The split was effective for shareholders of record after the close of the markets on January 9, 2017 and payable after the close of the markets on January 11, 2017. The Fund traded at its post-split price on January 12, 2017. The ticker symbol for the Fund did not change, and the Fund continues to trade on NYSE Arca.

The split was applied retroactively for all periods presented, increasing the number of shares outstanding for ProShares UltraShort Bloomberg Crude Oil, and resulted in a proportionate decrease in the price per share and per share information of ProShares UltraShort Bloomberg Crude Oil. Therefore, the split did not change the aggregate net asset value of a shareholder’s investment at the time of the split.

On December 22, 2016, the Trust announced a 1-for-2 reverse split of the shares of beneficial interest of ProShares Ultra Bloomberg Crude Oil (NYSE Arca symbol “UCO”) and a 1-for-5 reverse split of the shares of beneficial interest of ProShares Ultra VIX Short-Term Futures ETF (NYSE Arca symbol “UVXY”). The reverse splits were effective prior to the opening of trading on NYSE Arca on January 12, 2017.

The reverse splits were effective for shareholders at the market open on January 12, 2017, when the Funds traded at their post-split price. The ticker symbols for the Funds did not change, and each Fund was issued a new CUSIP numbers.

The reverse splits were applied retroactively for all periods presented, reducing the number of shares outstanding for ProShares Ultra Bloomberg Crude Oil and ProShares Ultra VIX Short-Term Futures ETF, and resulted in a proportionate increase in the price per share and per share information of ProShares Ultra Bloomberg Crude Oil and ProShares Ultra VIX Short-Term Futures ETF. Therefore, the reverse splits did not change the aggregate net asset value of a shareholder’s investment at the time of the reverse splits.