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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) (Commodity derivatives [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commodity derivatives [Member]
   
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 132.7us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
$ 226.6us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Gross Amounts Offset in the Balance Sheet 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Amounts of Assets Presented in the Balance Sheet 132.7us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
226.6us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Financial Instruments (91.2)epd_LiabilityDerivativeSettlementOffset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
(147.3)epd_LiabilityDerivativeSettlementOffset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Cash Collateral Received 0us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
(23.9)us-gaap_DerivativeCollateralObligationToReturnCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Cash Collateral Paid (28.4)epd_DerivativeAssetCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
0epd_DerivativeAssetCollateralRightToReclaimCash
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Amounts That Would Have Been Presented On Net Basis $ 13.1us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
$ 55.4us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember