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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | $ 38,756 | $ 38,402 |
Other non-equity method investments | 296 | 286 |
Total investments and advances | 39,052 | 38,688 |
Equity in Earnings | (472) | 3,968 | $ 6,327
United States | Investments and Advances |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 7,978 | 7,203 |
United States | Equity in Earnings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | 709 | 641 | 1,033
International | Investments and Advances |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investments and advances | 31,074 | 31,485 |
International | Equity in Earnings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in Earnings | (1,181) | 3,327 | 5,294
All Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | (14) | (14) |
Equity in Earnings | 0 | 0 | (2)
Upstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 27,653 | 26,936 |
Equity in Earnings | (1,140) | 2,787 | 4,649
Upstream | Operating Segments | Tengizchevroil |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 22,685 | 20,214 |
Equity in Earnings | 1,238 | 3,067 | 3,614
Upstream | Operating Segments | Petropiar |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 0 | 1,396 |
Equity in Earnings | (1,396) | 80 | 317
Upstream | Operating Segments | Petroboscan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 0 | 1,139 |
Equity in Earnings | (1,112) | (11) | 357
Upstream | Operating Segments | Caspian Pipeline Consortium |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 835 | 883 |
Equity in Earnings | 159 | 155 | 170
Upstream | Operating Segments | Angola LNG Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 2,258 | 2,423 |
Equity in Earnings | (166) | (26) | 172
Upstream | Operating Segments | Noble Midstream equity affiliates |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 895 | 0 |
Equity in Earnings | (9) | 0 | 0
Upstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 980 | 881 |
Equity in Earnings | 146 | (478) | 19
Downstream | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 11,117 | 11,480 |
Equity in Earnings | 668 | 1,181 | 1,680
Downstream | Operating Segments | Chevron Phillips Chemical Company LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 6,181 | 6,241 |
Equity in Earnings | 630 | 880 | 1,034
Downstream | Operating Segments | GS Caltex Corporation |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 3,547 | 3,796 |
Equity in Earnings | (185) | 13 | 373
Downstream | Operating Segments | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments and Advances | 1,389 | 1,443 |
Equity in Earnings | $ 223 | $ 288 | $ 273

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