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Summarized Financial Data - Chevron U.S.A. Inc. - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Subsidiary Statements Captions [Line Items]
Current assets	$ 33,988		$ 34,021
Current liabilities	30,233		27,171
Total CUSA net equity	156,892	$ 157,451	155,642	$ 154,673	$ 153,380	$ 149,319
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	12,717		12,819
Other assets	60,669		55,814
Current liabilities	14,640		16,376
Other liabilities	15,138		12,906
Total CUSA net equity	43,608		39,351
Memo: Total debt	$ 3,187		$ 3,049

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