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Summarized Financial Data - Chevron U.S.A. Inc. - Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Subsidiary Statements Captions [Line Items]
Current assets	$ 32,973		$ 26,078
Current liabilities	28,147		22,183
Total CUSA net equity	133,911	$ 132,933	132,726	$ 134,386	$ 144,914	$ 145,208
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	15,722		10,555
Other assets	47,427		48,054
Current liabilities	15,437		12,403
Other liabilities	22,102		14,102
Total CUSA net equity	25,610		32,104
Memo: Total debt	$ 14,972		$ 7,133

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