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Summarized Financial Data - Chevron U.S.A. Inc. - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Subsidiary Statements Captions [Line Items]
Current assets	$ 32,137		$ 26,078
Current liabilities	25,188		22,183
Total CUSA net equity	136,722	$ 133,911	132,726	$ 132,038	$ 134,386	$ 145,208
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	19,081		10,555
Other assets	47,219		48,054
Current liabilities	15,922		12,403
Other liabilities	21,877		14,102
Total CUSA net equity	28,501		32,104
Memo: Total debt	$ 15,009		$ 7,133

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