Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Balance Sheet - Chevron U.S.A. Inc.
Current assets	$ 32,471	$ 34,430
Current liabilities	24,927	25,467
Total CUSA net equity	148,325	153,886	$ 155,891	$ 156,191
Chevron U.S.A. Inc. [Member]
Balance Sheet - Chevron U.S.A. Inc.
Current assets	11,100	9,732
Other assets	56,910	59,170
Current liabilities	14,305	13,664
Other liabilities	27,392	29,100
Total CUSA net equity	26,313	26,138
Memo: Total debt	$ 14,457	$ 14,462