Consolidated Statement Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Net income	$ 62		$ 94		$ 130		$ 158
Gain (losses) from continuing operations on commodity derivatives designated as cash flow hedges:
Gains arising during period			3				2
Amount of losses reclassified into income	12		19		25		46
Net gains on commodity derivatives	12		22		25		48
Pension and other postretirement benefit plans	(6)		(5)		(5)		(4)
Other comprehensive income, before income taxes	6		17		20		44
Income tax expense related to other comprehensive income	2	[1]	7	[1]	8	[2]	18	[2]
Other comprehensive income, net of income taxes	4		10		12		26
Comprehensive Income	$ 66		$ 104		$ 142		$ 184

[1] Includes tax expense for losses reclassified to income during the three months ended June 30, 2012 and 2011 of $6 million and $9 million, respectively.

[2] Includes tax expense for losses reclassified to income during the six months ended June 30, 2012 and 2011 of $11 million and $20 million, respectively.