Summarized Financial Data - Chevron U.S.A. Inc. (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues	$ 56,603	[1]	$ 55,660	[1]	$ 166,206	[1]	$ 174,336	[1]
Costs and other deductions	49,668		48,112		144,983		147,001
Net income	4,950		5,253		16,493		18,934
Chevron U.S.A. Inc. [Member]
Statement of Income - Chevron U.S.A. Inc.
Sales and other operating revenues					131,650		139,107
Costs and other deductions					128,195		132,534
Net income					$ 2,898		$ 4,734

[1] * Includes excise, value-added and similar taxes:$2,223 $2,163 $6,364 $5,879