Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance Sheet - Chevron U.S.A. Inc.
Current assets	$ 53,234	$ 48,841
Current liabilities	33,600	29,012
Total CUSA net equity	122,181	105,811	92,561
Chevron U.S.A. Inc. [Member]
Balance Sheet - Chevron U.S.A. Inc.
Current assets	34,478	29,211
Other assets	47,556	35,294
Current liabilities	19,082	18,098
Other liabilities	26,153	16,785
Total CUSA net equity	36,799	29,622
Memo: Total debt	$ 14,763	$ 8,284