Summarized Financial Data - Chevron U.S.A. Inc. (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	$ 230,590	[1]	$ 244,371	[1]	$ 198,198	[1]
Total costs and other deductions	195,577		206,072		172,873
Net income	26,179	[2]	26,895	[2]	19,024	[2]
Chevron U.S.A. Inc. [Member]
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	183,215		187,929		143,352
Total costs and other deductions	175,009		178,510		137,964
Net income	$ 6,216		$ 6,898		$ 4,154

[1] *Includes excise, value-added and similar taxes.$8,010 $8,085 $8,591See accompanying Notes to the Consolidated Financial Statements.

[2] There was no effect of dividend equivalents paid on stock units or dilutive impact of employee stock-based awards on earnings.