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Equity-based Awards, Restricted Unit Awards (Details) (Restricted Common Unit Awards [Member], USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 8 Months Ended | 12 Months Ended | 11 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Enterprise [Member] | Dec. 31, 2011 Enterprise [Member] | Dec. 31, 2010 Enterprise [Member] | Dec. 31, 2012 Enterprise [Member] Minimum [Member] | Dec. 31, 2011 Enterprise [Member] Minimum [Member] | Dec. 31, 2010 Enterprise [Member] Minimum [Member] | Dec. 31, 2012 Enterprise [Member] Maximum [Member] | Dec. 31, 2011 Enterprise [Member] Maximum [Member] | Dec. 31, 2010 Enterprise [Member] Maximum [Member] | Sep. 06, 2011 Duncan Energy Partners [Member] | Dec. 31, 2011 Duncan Energy Partners [Member] | Dec. 31, 2010 Duncan Energy Partners [Member] | Nov. 21, 2010 Holdings [Member] | Dec. 31, 2010 Holdings [Member]
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of period (in units) |  |  |  | 3,868,216 |  | 3,561,614 |  | 2,720,882 |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Granted (in units) |  |  |  | 1,588,738 | [1],[2] | 1,414,630 | [3],[4] | 1,393,925 | [5],[6] |  |  |  |  |  |  | 3,666 | [3],[7] |  |  | 6,348 | [5],[8] | 3,424 | [5],[9] |  |
Vested (in units) |  |  |  | (1,316,603) | [1] | (924,108) | [3] | (383,628) | [5] |  |  |  |  |  |  | (3,666) | [3] |  |  | (6,348) | [5] | (3,424) | [5] |  |
Forfeited (in units) |  |  |  | (246,865) |  | (183,920) |  | (169,565) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period (in units) |  |  |  | 3,893,486 |  | 3,868,216 |  | 3,561,614 |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |
Restricted units outstanding, weighted-average grant date fair value [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value per unit, at beginning of period (in dollars per unit) |  |  |  | $ 34.22 | [10] | $ 29.78 | [10] | $ 27.70 | [10] |  |  |  |  |  |  | $ 0 | [10] | $ 0 | [10] | $ 0 | [10] | $ 0 | [10] | $ 0 | [10]
Granted weighted-average grant date fair value per unit (in dollars per unit) |  |  |  | $ 51.96 | [1],[10],[2] | $ 43.66 | [10],[3],[4] | $ 32.60 | [10],[5],[6] |  |  |  |  |  |  | $ 32.56 | [10],[3],[7] |  |  | $ 25.26 | [10],[5],[8] | $ 41.47 | [10],[5],[9] |  |
Vested weighted-average grant date fair value per unit (in dollars per unit) |  |  |  | $ 34.80 | [1],[10] | $ 31.54 | [10],[3] | $ 25.51 | [10],[5] |  |  |  |  |  |  | $ 32.56 | [10],[3] |  |  | $ 25.26 | [10],[5] | $ 41.47 | [10],[5] |  |
Forfeited weighted-average grant date fair value per unit (in dollars per unit) |  |  |  | $ 40.43 | [10] | $ 34.27 | [10] | $ 29.87 | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) |  |  |  | $ 40.87 | [10] | $ 34.22 | [10] | $ 29.78 | [10] |  |  |  |  |  |  | $ 0 | [10] |  |  | $ 0 | [10] | $ 0 | [10] |  |
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate grant date fair value |  |  |  | $ 82.5 |  | $ 61.8 |  | $ 45.4 |  |  |  |  |  |  |  |  |  | $ 0.1 |  | $ 0.2 |  |  |  | $ 0.1 |
Grant date market price of common units (in dollars per unit) |  |  |  |  |  |  |  |  |  | $ 51.92 | $ 40.54 | $ 32 | $ 53.54 | $ 44.67 | $ 43.18 |  |  | $ 32.56 |  | $ 25.26 |  |  |  | $ 41.47 |
Estimated forfeiture rate (in hundredths) |  |  |  | 3.25% |  | 4.60% |  | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity based awards issued to independent directors of the entities' general partner (in units) |  |  |  | 10,038 |  | 10,230 |  | 6,960 |  |  |  |  |  |  |  |  |  | 3,666 |  | 6,348 |  |  |  | 3,424 |
Cash distributions paid to restricted common unit holders | 10.5 | 9.6 | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of our restricted common unit awards that vested during period | 67.0 | 39.1 | 13.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 58.4 |  |  | $ 54.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition period for total unrecognized compensation cost | 1 year 11 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes awards granted to the independent directors of the board of directors of Enterprise GP as part of their annual compensation for 2012. A total of 10,038 restricted common unit awards were issued in February 2012 to the independent directors of Enterprise GP, which immediately vested upon issuance.
[2] | The aggregate grant date fair value of restricted common unit awards issued during 2012 was $82.5 million based on a grant date market price of our common units ranging from $51.92 to $53.54 per unit. An estimated annual forfeiture rate of 3.25% was applied to these awards.
[3] | Includes awards granted to the independent directors of the boards of directors of Enterprise GP and DEP GP as part of their annual compensation for 2011. A total of 10,230 and 3,666 restricted common unit awards were issued in February 2011 to the independent directors of Enterprise GP and DEP GP, respectively, which immediately vested upon issuance.
[4] | The aggregate grant date fair value of restricted common unit awards issued during 2011 was $61.8 million based on a grant date market price of our common units ranging from $40.54 to $44.67 per unit. An estimated annual forfeiture rate of 4.6% was applied to these awards.
[5] | Includes awards granted to the independent directors of the boards of directors of EPGP, DEP GP and Holdings GP as part of their annual compensation for 2010. A total of 6,960, 6,348 and 3,424 restricted common unit awards were issued in February 2010 to the independent directors of EPGP, DEP GP and Holdings GP, respectively, which immediately vested upon issuance.
[6] | The aggregate grant date fair value of restricted common unit awards issued during 2010 was $45.4 million based on grant date market prices of our common units ranging from $32.00 to $43.18 per unit. An estimated annual forfeiture rate of 4.6% was applied to these awards.
[7] | The aggregate grant date fair value of restricted common unit awards issued during 2011 denominated in Duncan Energy Partners' common units was $0.1 million based on a grant date market price of Duncan Energy Partners' common units of $32.56 per unit.
[8] | The aggregate grant date fair value of restricted common unit awards issued during 2010 denominated in Duncan Energy Partners' common units was $0.2 million based on a grant date market price of Duncan Energy Partners' common units of $25.26 per unit.
[9] | The aggregate grant date fair value of restricted common unit awards issued during 2010 denominated in Holdings' units was $0.1 million based on a grant date market price of Holdings' units of $41.47 per unit.
[10] | Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(e) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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