Other Financial Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Total financing interest and debt costs	$ 242		$ 288		$ 317
Less: Capitalized interest	242		288		267
Interest and debt expense	0		0		50
Research and development expenses	648		627		526
Foreign currency effects	(454)	[1]	121	[1]	(423)	[1]
Gains on sale of nonstrategic properties	2,800		1,300
Company share of equity affiliates foreign currency effects	(202)		(27)		(71)
Excess of replacement cost over carrying value of LIFO inventories	9,292		9,025
LIFO (charges) profits	121		193		21
Goodwill	4,640		4,642
Downstream [Member]
Segment Reporting Information [Line Items]
Gains on sale of nonstrategic properties	600		800
Upstream [Member]
Segment Reporting Information [Line Items]
Gains on sale of nonstrategic properties	2,200		500
Goodwill	$ 4,640		$ 4,642

[1] Includes $(202), $(27) and $(71) in 2012, 2011 and 2010, respectively, for the company’s share of equity affiliates’ foreign currency effects.