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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME      
Net income $ 2,607.1 $ 2,428.0 $ 2,088.3
Commodity derivative instruments:      
Changes in fair value of cash flow hedges (46.9) 17.3 (221.9)
Reclassification of losses to net income 22.1 14.2 232.3
Interest rate derivative instruments:      
Changes in fair value of cash flow hedges 6.6 (70.2) (333.2)
Reclassification of losses to net income 29.2 16.2 6.3
Total cash flow hedges 11.0 (22.5) (316.5)
Other 0.4 3.5 (1.3)
Total other comprehensive income (loss) 11.4 (19.0) (317.8)
Comprehensive income 2,618.5 2,409.0 1,770.5
Comprehensive income attributable to noncontrolling interests (10.2) (8.1) (41.4)
Comprehensive income attributable to limited partners $ 2,608.3 $ 2,400.9 $ 1,729.1