Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
Balance Sheet - Chevron U.S.A. Inc.
Current assets	$ 53,025	$ 48,841
Current liabilities	32,338	29,012
Total CUSA net equity	121,676	105,811	102,965	92,561
Chevron U.S.A. Inc. [Member]
Balance Sheet - Chevron U.S.A. Inc.
Current assets	34,995	29,211
Other assets	45,290	35,294
Current liabilities	20,084	18,098
Other liabilities	24,587	16,785
Total CUSA net equity	35,614	29,622
Memo: Total debt	$ 14,382	$ 8,284

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