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Investments and Advances - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |
Percentage of affiliate by summarized financial information | 100.00% |  |
Carrying amount of long-term debt | $ 23,730 | $ 30,234 |
Investments and advances | 35,261 | 32,105 |
Related Party Transaction, Other Revenues from Transactions with Related Party | 10,378 | 8,165 | $ 5,786
Purchased crude oil and products | 94,578 | 75,765 | 59,321
Accounts and notes receivable due from affiliated companies | 884 | 1,141 |
Accounts payable due to affiliated companies | 631 | 498 |
Chevron's loan to affiliates | 3,402 | 3,853 | 3,535
Affiliated Entity | Oil and Gas, Purchased |  |  |
Variable Interest Entity [Line Items] |  |  |
Purchased crude oil and products | $ 6,598 | $ 4,800 | $ 3,468
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 | $ 120 |  |
Notes receivable from affiliate | $ 2,060 |  |
Petropiar |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 30.00% |  |
Chevron investment carrying value less underlying equity in Petropiar net assets | $ 136 |  |
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 | $ 97 |  |
Carrying amount of long-term debt | $ 626 |  |
Caspian Pipeline Consortium |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 15.00% |  |
Long term loans of Caspian Pipeline Consortium included in investments and advances | $ 468 |  |
Percentage of Caspian Pipeline Consortium pipeline construction funded by Loans | 30.00% |  |
Angola LNG Limited |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investment, ownership percentage | 36.40% |  |
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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