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Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsidiary Statements Captions [Line Items]
Current assets	$ 34,021	$ 28,560
Current liabilities	27,171	27,737
Total CUSA net equity	155,642	149,319	$ 146,722	$ 153,886
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Current assets	12,819	12,163
Other assets	55,814	54,994
Current liabilities	16,376	17,379
Other liabilities	12,906	12,541
Total CUSA net equity	39,351	37,237
Memo: Total debt	$ 3,049	$ 3,056

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