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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 755.3 $ 655.5
Commodity derivative instruments:    
Changes in fair value of cash flow hedges (47.6) (59.6)
Reclassification of losses to net income 7.3 22.0
Interest rate derivative instruments:    
Changes in fair value of cash flow hedges 6.7 28.9
Reclassification of losses to net income 5.9 2.7
Total cash flow hedges (27.7) (6.0)
Change in funded status of pension and postretirement plans, net of tax 0 (1.2)
Proportionate share of other comprehensive income of unconsolidated affiliate 0 1.0
Change in fair value of available-for-sale equity securities 0 15.8
Total other comprehensive income (loss) (27.7) 9.6
Comprehensive income 727.6 665.1
Comprehensive income attributable to noncontrolling interests (1.8) (4.2)
Comprehensive income attributable to limited partners $ 725.8 $ 660.9