Other Income, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Other Income, Net
Reduction of allowance for loan receivable	$ 21	$ 0
Income from developing projects, net	14	24
Gain on asset sales, net	10	3
Canadian Oil Sands	9	6
Refinery income	5	0
Interest income	5	4
Ineffective portion of derivative instruments, net	2	(1)
Foreign currency exchange, net	(15)	(11)
Impairment of marketable securities	(24)	0
Other	6	6
Total	$ 33	$ 31

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