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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME        
Net income $ 592.8 $ 587.9 $ 1,901.4 $ 1,810.6
Commodity derivative instruments:        
Changes in fair value of cash flow hedges (8.6) (58.5) (22.1) (13.1)
Reclassification of losses to net income 14.6 0.9 14.7 37.1
Interest rate derivative instruments:        
Changes in fair value of cash flow hedges 0 (20.2) 6.7 (75.3)
Reclassification of losses to net income 7.7 4.5 21.4 10.9
Total cash flow hedges 13.7 (73.3) 20.7 (40.4)
Other 0 3.7 0.4 3.5
Total other comprehensive income (loss) 13.7 (69.6) 21.1 (36.9)
Comprehensive income 606.5 518.3 1,922.5 1,773.7
Comprehensive income attributable to noncontrolling interests (0.8) (1.1) (3.4) (6.2)
Comprehensive income attributable to limited partners $ 605.7 $ 517.2 $ 1,919.1 $ 1,767.5