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Investments and Advances - Summary of Investment and Advances and Equity in Earnings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | $ 35,261 | $ 32,105 |
Other non-equity method investments | 285 | 392 |
Total investments and advances | 35,546 | 32,497 |
Equity in Earnings | 6,327 | 4,438 | $ 2,661
United States | Investments and Advances |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 7,500 | 7,582 |
United States | Equity in Earnings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | 1,033 | 788 | 802
International | Investments and Advances |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 28,046 | 24,915 |
International | Equity in Earnings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | 5,294 | 3,650 | 1,859
All Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | (16) | (15) |
Equity in Earnings | (2) | (1) | (4)
Upstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 23,752 | 20,843 |
Equity in Earnings | 4,649 | 3,196 | 1,243
Upstream | Operating Segments | Tengizchevroil |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 16,017 | 13,121 |
Equity in Earnings | 3,614 | 2,581 | 1,380
Upstream | Operating Segments | Petropiar |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,361 | 1,152 |
Equity in Earnings | 317 | 175 | 326
Upstream | Operating Segments | Petroboscan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,315 | 1,080 |
Equity in Earnings | 357 | 154 | (133)
Upstream | Operating Segments | Caspian Pipeline Consortium |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,022 | 1,151 |
Equity in Earnings | 170 | 155 | 145
Upstream | Operating Segments | Angola LNG Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 2,496 | 2,625 |
Equity in Earnings | 172 | 27 | (282)
Upstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,541 | 1,714 |
Equity in Earnings | 19 | 104 | (193)
Downstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 11,525 | 11,277 |
Equity in Earnings | 1,680 | 1,243 | 1,422
Downstream | Operating Segments | Chevron Phillips Chemical Company LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 6,218 | 6,200 |
Equity in Earnings | 1,034 | 723 | 840
Downstream | Operating Segments | GS Caltex Corporation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 3,924 | 3,826 |
Equity in Earnings | 373 | 290 | 373
Downstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,383 | 1,251 |
Equity in Earnings | $ 273 | $ 230 | $ 209

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