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Investments and Advances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | $ 32,105 | $ 29,789 |
Other at or below cost | 392 | 461 |
Total investments and advances | 32,497 | 30,250 |
Equity in Earnings | 4,438 | 2,661 | $ 4,684
Investments and Advances | United States |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 7,582 | 7,258 |
Investments and Advances | International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 24,915 | 22,992 |
Equity in Earnings | United States |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | 788 | 802 | 1,342
Equity in Earnings | International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | 3,650 | 1,859 | 3,342
All Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | (15) | (16) |
Equity in Earnings | (1) | (4) | (3)
Upstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 20,843 | 19,153 |
Equity in Earnings | 3,196 | 1,243 | 2,218
Upstream | Operating Segments | Tengizchevroil LLP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 13,121 | 11,414 |
Equity in Earnings | 2,581 | 1,380 | 1,939
Upstream | Operating Segments | Petropiar |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,152 | 977 |
Equity in Earnings | 175 | 326 | 180
Upstream | Operating Segments | Caspian Pipeline Consortium |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,151 | 1,245 |
Equity in Earnings | 155 | 145 | 162
Upstream | Operating Segments | Petroboscan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,080 | 982 |
Equity in Earnings | 154 | (133) | 219
Upstream | Operating Segments | Angola LNG Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 2,625 | 2,744 |
Equity in Earnings | 31 | (282) | (417)
Upstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,714 | 1,791 |
Equity in Earnings | 100 | (193) | 135
Downstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 11,277 | 10,652 |
Equity in Earnings | 1,243 | 1,422 | 2,469
Downstream | Operating Segments | GS Caltex Corporation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 3,826 | 3,767 |
Equity in Earnings | 290 | 373 | 824
Downstream | Operating Segments | Chevron Phillips Chemical Company LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 6,200 | 5,767 |
Equity in Earnings | 723 | 840 | 1,367
Downstream | Operating Segments | Caltex Australia Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 0 | 0 |
Equity in Earnings | 0 | 0 | 92
Downstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,251 | 1,118 |
Equity in Earnings | $ 230 | $ 209 | $ 186

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