Divestitures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Disposal Groups Including Discontinued Operations Disclosure Details [Abstract]
Discontinued operations, net of tax	$ (5)	$ (4)	$ (79)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Earnings attributable to noncontrolling interest	0
Synthetic fuels matters
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
After-tax loss contingency, loss in period			74
Terminals operations and synthetic fuels businesses
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Revenues	0	0	0
(Loss) earnings before income taxes and noncontrolling interest	(8)	(11)	(125)
Income tax benefit	3	5	47
Net (loss) earnings from discontinued operations attributable to controlling interests	(5)	(6)	(78)
Amount of deferred income tax benefit (expense) related to synthetic fuels tax credits included in income tax benefit	28	124	(86)
Gain (loss) on disposal of discontinued operation, tax expense			$ 0