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Summarized Financial Data - Chevron U.S.A. Inc. (Details 1) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Subsidiary Statements Captions [Line Items] |  |  |  |
Current assets | $ 35,583 | $ 28,560 |  |
Current liabilities | 29,183 | 27,737 |  |
Total CUSA net equity | 154,673 | 149,319 | $ 147,911 | $ 146,722
Chevron U.S.A. Inc. |  |  |  |
Subsidiary Statements Captions [Line Items] |  |  |  |
Current assets | 15,036 | 12,163 |  |
Other assets | 55,209 | 54,994 |  |
Current liabilities | 18,329 | 17,379 |  |
Other liabilities | 13,049 | 12,541 |  |
Total CUSA net equity | 38,867 | 37,237 |  |
Memo: Total debt | $ 3,049 | $ 3,056 |  |

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