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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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