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Business Segments (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Segment
Jun. 30, 2014
USD ($)
Business Segments [Abstract]        
Number of reportable segments | Segment     5  
Segment Gross Operating Margin [Abstract]        
Revenues $ 7,092.5 $ 12,520.8 $ 14,565.0 $ 25,430.7
Subtract operating costs and expenses (6,357.5) (11,639.1) (12,973.9) (23,519.6)
Add equity in income of unconsolidated affiliates 110.2 50.3 199.4 106.8
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin 385.6 312.4 730.9 613.8
Add impairment charges not reflected in gross operating margin 79.0 3.7 112.3 12.5
Add net losses or subtract net gains attributable to asset sales and insurance recoveries not reflected in gross operating margin (see Note 16) 2.5 (6.8) 2.4 (96.4)
Add non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin 5.2 21.9 35.9 45.2
Subtract subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin (14.3) 0.0 (34.4) 0.0
Total segment gross operating margin 1,303.2 1,263.2 2,637.6 2,593.0
Reconciliation of total Segment Gross Operating Margin [Abstract]        
Total segment gross operating margin 1,303.2 1,263.2 2,637.6 2,593.0
Adjustments to reconcile total segment gross operating margin to operating income:        
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin (385.6) (312.4) (730.9) (613.8)
Subtract impairment charges not reflected in gross operating margin (79.0) (3.7) (112.3) (12.5)
Add net gains or subtract net losses attributable to asset sales and insurance recoveries not reflected in gross operating margin (2.5) 6.8 (2.4) 96.4
Subtract non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin (5.2) (21.9) (35.9) (45.2)
Add subsequent recognition of deferred revenues attributable to make-up rights not reflected in gross operating margin 14.3 0.0 34.4 0.0
Subtract general and administrative costs not reflected in gross operating margin (44.9) (47.7) (94.2) (100.9)
Operating income 800.3 884.3 1,696.3 1,917.0
Other expense, net (251.6) (227.8) (490.2) (449.0)
Income before income taxes $ 548.7 $ 656.5 $ 1,206.1 $ 1,468.0