Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsidiary Statements Captions [Line Items]
Current assets	$ 29,619	$ 34,430
Current liabilities	31,785	25,467
Total CUSA net equity	146,722	153,886	$ 156,191
Chevron U.S.A. Inc. [Member]
Subsidiary Statements Captions [Line Items]
Current assets	11,266	9,096
Other assets	55,722	59,171
Current liabilities	16,660	13,664
Other liabilities	21,701	28,465
Total CUSA net equity	28,627	26,138
Memo: Total debt	$ 9,418	$ 14,462