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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
SegmentINF
Mar. 31, 2013
Business Segments [Abstract]    
Number of reportable segments 5  
Segment Gross Operating Margin [Abstract]    
Revenues $ 12,909.9 $ 11,383.1
Subtract operating costs and expenses (11,880.5) (10,420.4)
Add equity in income of unconsolidated affiliates 56.5 44.5
Add depreciation, amortization and accretion expense amounts not reflected in gross operating margin 301.4 276.8
Add impairment charges not reflected in gross operating margin 8.8 11.0
Subtract net gains attributable to asset sales and insurance recoveries not reflected in gross operating margin (89.6) (63.9)
Add non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin 23.3 0
Total segment gross operating margin 1,329.8 1,231.1
Reconciliation of total Segment Gross Operating Margin [Abstract]    
Total segment gross operating margin 1,329.8 1,231.1
Adjustments to reconcile total segment gross operating margin to operating income:    
Subtract depreciation, amortization and accretion expense amounts not reflected in gross operating margin (301.4) (276.8)
Subtract impairment charges not reflected in gross operating margin (8.8) (11.0)
Add net gains attributable to asset sales and insurance recoveries not reflected in gross operating margin (see Note 16) 89.6 63.9
Subtract non-refundable deferred revenues attributable to shipper make-up rights on new pipeline projects reflected in gross operating margin (23.3) 0
Subtract general and administrative costs not reflected in gross operating margin (53.2) (49.5)
Operating income 1,032.7 957.7
Other expense, net (221.2) (196.0)
Income before income taxes $ 811.5 $ 761.7