Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsidiary Statements Captions [Line Items]
Current assets	$ 35,347	$ 42,232
Current liabilities	26,464	31,926
Total CUSA net equity	153,886	156,191	$ 150,427
Chevron U.S.A. Inc. [Member]
Subsidiary Statements Captions [Line Items]
Current assets	9,732	13,724
Other assets	59,170	62,195
Current liabilities	13,664	16,191
Other liabilities	29,100	30,175
Total CUSA net equity	26,138	29,553
Memo: Total debt	$ 14,462	$ 14,473