v2.4.1.9

Statements of Financial Condition (Parenthetical) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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ProShares VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | $ 131,183,329 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | $ 82,086,464 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
ProShares VIX Mid-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 27,674,827 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | 24,104,754 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
ProShares Short VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 222,916,842 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | 446,972,637 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 569,902,127 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | 182,641,263 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
ProShares UltraShort Bloomberg Commodity [Member] |  |
Short-term U.S. government and agency obligations, cost | 4,990,615 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember | 4,233,396 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Short-term U.S. government and agency obligations, cost | 319,738,023 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | 131,592,367 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
ProShares UltraShort Bloomberg Natural Gas [Member] |  |
Short-term U.S. government and agency obligations, cost | 8,979,490 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | 8,672,527 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
ProShares UltraShort Gold [Member] |  |
Short-term U.S. government and agency obligations, cost | 79,438,253 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | 84,038,905 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
ProShares UltraShort Silver [Member] |  |
Short-term U.S. government and agency obligations, cost | 50,000,423 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | 52,225,712 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
ProShares Short Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 18,011,817 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | 12,086,398 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
ProShares UltraShort Australian Dollar [Member] |  |
Short-term U.S. government and agency obligations, cost | 16,932,386 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | 20,267,681 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
ProShares UltraShort Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 549,433,835 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember | 487,097,789 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
ProShares UltraShort Yen [Member] |  |
Short-term U.S. government and agency obligations, cost | 444,086,152 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember | 532,944,509 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
ProShares Ultra Bloomberg Commodity [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,242,745 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember | 2,754,883 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
ProShares Ultra Bloomberg Crude Oil [Member] |  |
Short-term U.S. government and agency obligations, cost | 1,066,107,943 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | 467,195,638 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
ProShares Ultra Bloomberg Natural Gas [Member] |  |
Short-term U.S. government and agency obligations, cost | 57,169,151 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | 53,408,848 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
ProShares Ultra Gold [Member] |  |
Short-term U.S. government and agency obligations, cost | 94,231,992 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | 101,925,636 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
ProShares Ultra Silver [Member] |  |
Short-term U.S. government and agency obligations, cost | 294,492,151 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | 305,465,636 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
ProShares Ultra Australian Dollar [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,201,929 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | 2,405,682 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
ProShares Ultra Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 15,242,859 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember | 2,415,732 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
ProShares Ultra Yen [Member] |  |
Short-term U.S. government and agency obligations, cost | 5,210,360 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember | 1,287,844 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
ProShares Trust II [Member] |  |
Short-term U.S. government and agency obligations, cost | $ 3,980,187,249 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember | $ 3,005,824,301 ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember

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