Summarized Financial Data - Chevron U.S.A. Inc. (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	$ 51,822	[1],[2]	$ 56,603	[1],[2]	$ 158,383	[1],[2]	$ 166,206	[1],[2]
Costs and other deductions	45,816		49,668		140,064		144,983
Net income attributable to CUSA	5,593	[2]	4,950	[2]	15,770	[2]	16,493	[2]
Chevron U.S.A. Inc. [Member]
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues					124,957		131,650
Costs and other deductions					120,977		128,195
Net income attributable to CUSA					$ 3,697		$ 2,898

[1] * Includes excise, value-added and similar taxes:$2,116 $2,223 $6,182 $6,364

[2] Effective January 1, 2014, International Upstream prospectively includes selected amounts previously recognized in International Downstream, which are not material to the company’s results of operations or financial position.