| Document and Entity Information | Mar. 09, 2020 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001415311 |
| Document Type | 8-K |
| Document Period End Date | Mar. 9, 2020 |
| Entity Registrant Name | ProShares Trust II |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34200 |
| Entity Tax Identification Number | 87-6284802 |
| Entity Address, Address Line One | c/o ProShare Capital Management LLC |
| Entity Address, Address Line Two | 7501 Wisconsin Avenue |
| Entity Address, Address Line Three | Suite 1000E |
| Entity Address, City or Town | Bethesda |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20814 |
| City Area Code | 240 |
| Local Phone Number | 497-6400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Proshares Ultra Pro Threex Crude Oil Etf [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | ProShares UltraPro 3x Crude Oil ETF |
| Trading Symbol | OILU |
| Security Exchange Name | NYSEArca |
| Proshares Ultra Pro 3 X Short Crude Oil Etf [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | ProShares UltraPro 3x Short Crude Oil ETF |
| Trading Symbol | OILD |
| Security Exchange Name | NYSEArca |
