Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Equity (Textual) [Abstract]
Company's share of undistributed earnings for equity affiliates	$ 10,119	$ 10,127
Shares available for issuance under the Chevron Corporation LTIP	55,000,000
Maximum number of share that may be issued under LTIP from April 2004 through January 2014 (in shares)	160,000,000
Shares available for issuance under company's non employee directors plan	231,000
Shares authorized for issuance under company's non employee directors plan	800,000