Consolidated Statements Of Comprehensive Income (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Consolidated Statements Of Comprehensive Income
Net Income (Loss)	$ 80		$ 17		$ 238		$ (1)
Gain (losses) from continuing operations on commodity derivatives designated as cash flow hedges:
Gains (losses) arising during period			(38)		2		(116)
Amount of losses reclassified into income	16	[1]	23	[1]	62	[1]	110	[1]
Net gains (losses) on commodity derivatives	16		(15)		64		(6)
Losses on treasury rate locks reclassified into income	1		15		1		18
Amortization of losses (gains) for prior service costs	2				(2)		4
Prior service costs arising during period	(4)				(4)
Other comprehensive income from continuing operations, before income taxes	15				59		16
Income tax expense related to other comprehensive income from continuing operations	6				24		7
Other comprehensive income from continuing operations, net of income taxes	9				35		9
Other Comprehensive Income from Discontinued Operations, Net of Income Taxes			13				84
Comprehensive Income	$ 89		$ 30		$ 273		$ 92

[1] For the three and nine months ended September 30, 2011, $1 million was reclassified from AOCL to income because the forecasted hedged transactions were deemed probable not to occur. For the three and nine months ended September 30, 2010, no amounts were reclassified from AOCL to income because the forecasted hedged transactions were deemed probable not to occur.