Summarized Financial Data - Tengizchevroil LLP (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014 Tengizchevroil LLP [Member]	Mar. 31, 2013 Tengizchevroil LLP [Member]	Dec. 31, 2013 Tengizchevroil LLP [Member]	Dec. 31, 2013 Tengizchevroil LLP [Member] KAZAKHSTAN [Member]
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage			50.00%
Period of crude oil field development				40 years
Percentage of affiliate by summarized financial information			100.00%
Sales and other operating revenues	$ 6,433	$ 6,798
Costs and other deductions	2,833	2,970
Net income attributable to TCO	$ 2,514	$ 2,684