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Business Segments (Details) (USD $) In Millions, 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
Business Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  | 5 |  |
Segment Gross Operating Margin [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 11,072.1 | $ 10,468.7 | $ 9,789.8 | $ 11,252.5 | $ 11,585.7 | $ 11,327.1 | $ 11,216.5 | $ 10,183.7 | $ 42,583.1 | $ 44,313.0 | $ 33,739.3
Less: Operating costs and expenses |  |  |  |  |  |  |  |  | (39,367.9) | (41,318.5) | (31,449.3)
Add: Equity in income of unconsolidated affiliates |  |  |  |  |  |  |  |  | 64.3 | 46.4 | 62.0
Depreciation, amortization and accretion recorded in operating costs and expenses |  |  |  |  |  |  |  |  | 1,061.7 | 958.7 | 936.3
Non-cash asset impairment charges recorded in operating costs and expenses |  |  |  |  |  |  |  |  | 63.4 | 27.8 | 8.4
Operating lease expenses paid by EPCO recorded in operating costs and expenses |  |  |  |  |  |  |  |  | 0 | 0.3 | 0.7
Gains attributable to disposal of assets recorded in operating costs and expenses |  |  |  |  |  |  |  |  | (17.6) | (156.0) | (44.4)
Total segment gross operating margin |  |  |  |  |  |  |  |  | 4,387.0 | 3,871.7 | 3,253.0
Reconciliation of total Segment Gross Operating Margin [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total segment gross operating margin |  |  |  |  |  |  |  |  | 4,387.0 | 3,871.7 | 3,253.0
Adjustments to reconcile total segment gross operating margin to operating income: |  |  |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion |  |  |  |  |  |  |  |  | (1,061.7) | (958.7) | (936.3)
Non-cash asset impairment charges |  |  |  |  |  |  |  |  | (63.4) | (27.8) | (8.4)
Operating lease expenses paid by EPCO |  |  |  |  |  |  |  |  | 0 | (0.3) | (0.7)
Gains attributable to disposal of assets |  |  |  |  |  |  |  |  | 17.6 | 156.0 | 44.4
General and administrative costs |  |  |  |  |  |  |  |  | (170.3) | (181.8) | (204.8)
Operating income | 822.7 | 788.5 | 749.1 | 748.9 | 909.2 | 681.1 | 643.9 | 624.9 | 3,109.2 | 2,859.1 | 2,147.2
Other expense, net |  |  |  |  |  |  |  |  | (698.4) | (743.6) | (737.4)
Income before income taxes |  |  |  |  |  |  |  |  | $ 2,410.8 | $ 2,115.5 | $ 1,409.8
Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest non-affiliated customer percentage (in hundredths) |  |  |  |  |  |  |  |  |  | 10.60% | 9.40%
BP [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Largest non-affiliated customer percentage (in hundredths) |  |  |  |  |  |  |  |  | 9.50% |  |

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