Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiary Statements Captions [Line Items]
Current assets	$ 33,738	$ 26,078
Current liabilities	26,791	22,183
Total CUSA net equity	139,940	132,726	$ 145,208	$ 155,642
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	20,216	10,555
Other assets	47,355	48,054
Current liabilities	17,824	12,403
Other liabilities	18,438	14,102
Total CUSA net equity	31,309	32,104
Memo: Total debt	$ 11,693	$ 7,133