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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current Assets and Current Liabilities [Abstract] |  |  |  |  |  |
Threshold for components of total current assets and liabilities to be presented as an individual caption on Consolidated Balance Sheet (in hundredths) | 5.00%epd_ThresholdForComponentsOfTotalCurrentAssetsAndLiabilitiesToBePresentedAsIndividualCaptionOnConsolidatedBalanceSheet |  |  |  |  |
Environmental Costs [Abstract] |  |  |  |  |  |
Environmental reserves - current portion | $ 8.1 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  | $ 6.0 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  |  |
Other Non-operating Income [Abstract] |  |  |  |  |  |
Gain on sales of available-for-sale securities of Energy Transfer Equity | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | [1] | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | [1] | 68.8 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | [1]
Other | 0.6 epd_OtherNonoperatingIncomeExpenseOther |  | (1.1)epd_OtherNonoperatingIncomeExpenseOther |  | 3.8 epd_OtherNonoperatingIncomeExpenseOther |
Total | 0.6 us-gaap_OtherNonoperatingIncomeExpense |  | (1.1)us-gaap_OtherNonoperatingIncomeExpense |  | 72.6 us-gaap_OtherNonoperatingIncomeExpense |
Restricted Cash [Abstract] |  |  |  |  |  |
Restricted cash | 0 us-gaap_RestrictedCashAndInvestmentsCurrent |  | 65.6 us-gaap_RestrictedCashAndInvestmentsCurrent |  |  |
Minor Investment [Member] | Maximum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = epd_MinorInvestmentMember |  |  |  |  |
Minor Investment [Member] | Minimum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 3.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = epd_MinorInvestmentMember |  |  |  |  |
Major Investment [Member] | Maximum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = epd_MajorInvestmentMember |  |  |  |  |
Major Investment [Member] | Minimum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = epd_MajorInvestmentMember |  |  |  |  |
Allowance for Doubtful Accounts, Current [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 7.5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 13.2 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 13.4 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |
Charged to costs and expenses | 8.4 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 2.1 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 0.3 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |
Deductions | (2.0)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | [2] | (7.8)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | [2] | (0.5)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | [2]
Balance at end of period | 13.9 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 7.5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |  | 13.2 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember |
Reserve for Environmental Costs [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 9.9 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 13.7 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 12.3 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |
Charged to costs and expenses | 11.9 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 3.9 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 13.9 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |
Acquisition-related additions and other | 2.5 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 0.7 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | 5.2 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |
Deductions | (8.7)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | (8.4)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | (17.7)us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |
Balance at end of period | $ 15.6 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | $ 9.9 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  | $ 13.7 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |
[1] | See Note 9 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.
[2] | The 2013 deduction is primarily due to the write-off of certain amounts attributable to companies in bankruptcy and amounts we believe are no longer collectible.

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