Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Balance Sheet - Chevron U.S.A. Inc.
Current assets	$ 28,873	$ 34,430
Current liabilities	24,744	25,467
Total CUSA net equity	147,952	153,886	$ 155,938	$ 156,191
Chevron U.S.A. Inc. [Member]
Balance Sheet - Chevron U.S.A. Inc.
Current assets	9,872	9,097
Other assets	56,004	59,170
Current liabilities	13,268	13,664
Other liabilities	21,992	28,465
Total CUSA net equity	30,616	26,138
Memo: Total debt	$ 9,457	$ 14,462