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Investments and Advances - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Percentage of affiliate by summarized financial information | 100.00% |  |
Carrying amount of long-term debt | $ 25,676 |  |
Investments and advances | 38,756 | $ 38,402 |
Other revenues from transactions with related party | 6,038 | 8,006 | $ 10,378
Purchased crude oil and products | 50,488 | 80,113 | 94,578
Accounts and notes receivable due from affiliated companies | 807 | 810 |
Accounts payable due to affiliated companies | 244 | 506 |
Chevron's loan to affiliates | 5,153 | 4,331 | 3,402
Affiliated Entity | Oil and Gas, Purchased |  |  |
Variable Interest Entity [Line Items] |  |  |
Purchased crude oil and products | $ 3,003 | $ 5,694 | $ 6,598
Tengizchevroil LLP |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Chevron investment carrying value over underlying equity in TCO's net assets | $ 100 |  |
Notes receivable from affiliate | $ 4,825 |  |
Petropiar |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 30.00% |  |
Chevron investment carrying value less underlying equity in Petropiar net assets | $ 1,500 |  |
Petroboscan |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 39.20% |  |
Chevron investment carrying value over underlying equity in Petroboscan's net assets | $ 1,100 |  |
Carrying amount of long-term debt | $ 560 |  |
Caspian Pipeline Consortium |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 15.00% |  |
Angola LNG Limited |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 36.40% |  |
Advantage Pipeline LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Delaware Crossing LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
EPIC Crude Holdings |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 30.00% |  |
EPIC Y-Grade |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 15.00% |  |
EPIC Propane |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 15.00% |  |
Saddlehorn Pipeline Company, LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Chevron Phillips Chemical Company LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
GS Caltex Corporation |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |

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