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Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiary Statements Captions [Line Items]
Current assets	$ 28,329	$ 34,021
Current liabilities	26,530	27,171
Total CUSA net equity	145,208	155,642	$ 149,319	$ 146,722
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	13,059	12,819
Other assets	50,796	55,814
Current liabilities	18,291	16,376
Other liabilities	12,565	12,906
Total CUSA net equity	32,999	39,351
Memo: Total debt	$ 3,222	$ 3,049

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