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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Segment
Dec. 31, 2012
Dec. 31, 2011
Business Segments [Abstract]                      
Number of reportable segments                 5    
Segment Gross Operating Margin [Abstract]                      
Revenues                 $ 47,727.0 $ 42,583.1 $ 44,313.0
Subtract operating costs and expenses                 (44,238.7) (39,367.9) (41,318.5)
Add equity in income of unconsolidated affiliates                 167.3 64.3 46.4
Add depreciation, amortization and accretion expense amounts excluded from gross operating margin                 1,148.9 1,061.7 958.7
Add impairment charges excluded from gross operating margin                 92.6 63.4 27.8
Add operating lease expenses paid by EPCO excluded from gross operating margin                 0 0 0.3
Subtract gains attributable to asset sales and insurance recoveries excluded from gross operating margin                 (83.4) (17.6) (156.0)
Add non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects included in gross operating margin                 4.4 0 0
Total segment gross operating margin                 4,818.1 4,387.0 3,871.7
Reconciliation of total Segment Gross Operating Margin [Abstract]                      
Total segment gross operating margin                 4,818.1 4,387.0 3,871.7
Adjustments to reconcile total segment gross operating margin to operating income:                      
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin                 (1,148.9) (1,061.7) (958.7)
Subtract impairment charges not reflected in gross operating margin                 (92.6) (63.4) (27.8)
Subtract operating lease expenses paid by EPCO not reflected in gross operating margin                 0 0 (0.3)
Add gains attributable to asset sales and insurance recoveries not reflected in gross operating margin                 83.4 17.6 156.0
Subtract non-refundable deferred revenues included in gross operating margin attributable to shipper make-up rights on new pipeline projects                 (4.4) 0 0
Subtract general and administrative costs not reflected in gross operating margin                 (188.3) (170.3) (181.8)
Operating income 915.5 819.9 774.2 957.7 822.7 788.5 749.1 748.9 3,467.3 3,109.2 2,859.1
Other expense, net                 (802.7) (698.4) (743.6)
Income before income taxes                 $ 2,664.6 $ 2,410.8 $ 2,115.5
Shell Oil Company [Member] | Revenues [Member]
                      
Revenue, Major Customer [Line Items]                      
Largest non-affiliated customer percentage (in hundredths)                     10.60%
BP [Member] | Revenues [Member]
                      
Revenue, Major Customer [Line Items]                      
Largest non-affiliated customer percentage (in hundredths)                 9.00% 9.50%