Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Balance Sheet - Chevron U.S.A. Inc.
Current assets	$ 47,083	$ 50,250
Current liabilities	37,088	33,018
Total Equity	157,307	150,427	146,073	137,832
Chevron U.S.A. Inc. [Member]
Balance Sheet - Chevron U.S.A. Inc.
Current assets	16,307	17,626
Other assets	60,577	57,288
Current liabilities	18,820	17,486
Other liabilities	28,681	28,119
Total Equity	29,383	29,309
Memo: Total debt	$ 14,475	$ 14,482