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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME        
Net income $ 587.9 $ 479.5 $ 1,810.6 $ 1,362.5
Commodity derivative instruments:        
Changes in fair value of cash flow hedges (58.5) (6.1) (13.1) (179.2)
Reclassification of gains and losses to net income 0.9 35.1 37.1 178.8
Interest rate derivative instruments:        
Changes in fair value of cash flow hedges (20.2) (260.1) (75.3) (306.1)
Reclassification of gains and losses to net income 4.5 1.6 10.9 4.6
Total cash flow hedges (73.3) (229.5) (40.4) (301.9)
Change in funded status of pension and postretirement plans, net of tax 3.7 0 2.5 (0.6)
Proportionate share of other comprehensive income (loss) of unconsolidated affiliate 0 0 1.0 (0.7)
Total other comprehensive loss (69.6) (229.5) (36.9) (303.2)
Comprehensive income 518.3 250.0 1,773.7 1,059.3
Comprehensive income attributable to noncontrolling interests (1.1) (8.1) (6.2) (36.7)
Comprehensive income attributable to entity $ 517.2 $ 241.9 $ 1,767.5 $ 1,022.6