Summarized Financial Data - Tengizchevroil LLP (Details) (Tengizchevroil LLP [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Tengizchevroil LLP [Member]
Summarized Financial Data - Tengizchevroil LLP
Sales and other operating revenues	$ 25,278	$ 17,812	$ 12,013
Costs and other deductions	10,941	8,394	6,044
Net income attributable to TCO	$ 10,039	$ 6,593	$ 4,178