Summarized Financial Data - Chevron U.S.A. Inc. (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	$ 55,583	[1],[2]	$ 55,307	[1],[2]	$ 106,561	[1],[2]	$ 109,603	[1],[2]
Costs and other deductions	48,911		48,780		94,248		95,315
Net income	5,665	[1]	5,365	[1]	10,177	[1]	11,543	[1]
Chevron U.S.A. Inc. [Member]
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues					84,841		85,598
Costs and other deductions					82,242		83,253
Net income					$ 2,438		$ 2,037

[1] 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.

[2] * Includes excise, value-added and similar taxes:$2,120 $2,108 $4,066 $4,141