Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Subsidiary Statements Captions [Line Items]
Current assets	$ 50,250	$ 55,720
Current liabilities	33,018	34,212
Total Equity	150,427	137,832	122,181
Chevron U.S.A. Inc. [Member]
Subsidiary Statements Captions [Line Items]
Current assets	17,626	18,983
Other assets	57,288	52,082
Current liabilities	17,486	18,161
Other liabilities	28,119	26,472
Total Equity	29,309	26,432
Memo: Total debt	$ 14,482	$ 14,482