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Earnings Per Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Merger exchange ratio of Enterprise common units for each Holding unit |  |  |  |  |  |  |  |  |  |  | 1.5
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners |  |  |  |  |  |  |  |  | $ 2,419.9 | $ 2,046.9 | $ 320.8
Denominator: |  |  |  |  |  |  |  |  |  |  |
Distribution-bearing common units outstanding (in units) |  |  |  |  |  |  |  |  | 861.8 | 824.6 | 274.5
Basic earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners, basic (in dollars per unit) | $ 0.70 | $ 0.68 | $ 0.66 | $ 0.76 | $ 0.85 | $ 0.57 | $ 0.53 | $ 0.52 | $ 2.81 | $ 2.48 | $ 1.17
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners |  |  |  |  |  |  |  |  | $ 2,419.9 | $ 2,046.9 | $ 320.8
Denominator: |  |  |  |  |  |  |  |  |  |  |
Distribution-bearing common units outstanding (in units) |  |  |  |  |  |  |  |  | 861.8 | 824.6 | 274.5
Class B units (in units) |  |  |  |  |  |  |  |  | 4.5 | 4.5 | 0.5
Designated Units (in units) |  |  |  |  |  |  |  |  | 25.5 | 29.5 | 3.4
Incremental option units (in units) |  |  |  |  |  |  |  |  | 1.4 | 1.3 | 0.1
Total (in units) |  |  |  |  |  |  |  |  | 893.2 | 859.9 | 278.5
Diluted earnings per unit: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to limited partners, diluted (in dollars per unit) | $ 0.68 | $ 0.66 | $ 0.64 | $ 0.73 | $ 0.82 | $ 0.55 | $ 0.51 | $ 0.49 | $ 2.71 | $ 2.38 | $ 1.15

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