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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME
Net income	$ 553.3	$ 567.2	$ 1,308.6	$ 1,222.7
Commodity derivative instruments:
Changes in fair value of cash flow hedges	34.1	105.0	(13.5)	45.4
Reclassification of gains and losses to net income	(7.2)	14.2	0.1	36.2
Interest rate derivative instruments:
Changes in fair value of cash flow hedges	0	(84.0)	6.7	(55.1)
Reclassification of losses to net income	7.8	3.7	13.7	6.4
Total cash flow hedges	34.7	38.9	7.0	32.9
Change in funded status of pension and postretirement plans, net of tax	0.4	0	0.4	(1.2)
Proportionate share of other comprehensive income of unconsolidated affiliate	0	0	0	1.0
Change in fair value of available-for-sale equity securities	0	(15.8)	0	0
Total other comprehensive income	35.1	23.1	7.4	32.7
Comprehensive income	588.4	590.3	1,316.0	1,255.4
Comprehensive income attributable to noncontrolling interests	(0.8)	(0.9)	(2.6)	(5.1)
Comprehensive income attributable to entity	$ 587.6	$ 589.4	$ 1,313.4	$ 1,250.3

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Net of tax effect change in accumulated gains and losses from commodity derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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