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Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsidiary Statements Captions [Line Items]
Current assets	$ 26,078	$ 28,329
Current liabilities	22,183	26,530
Total CUSA net equity	132,726	145,208	$ 155,642	$ 149,319
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	10,555	13,059
Other assets	48,054	50,796
Current liabilities	12,403	18,291
Other liabilities	14,102	12,565
Total CUSA net equity	32,104	32,999
Memo: Total debt	$ 7,133	$ 3,222

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