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Investments and Advances - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	40,357	$ 38,756
Other revenues from transactions with related party	10,796	6,038	$ 8,006
Purchased crude oil and products	89,372	50,488	80,113
Accounts and notes receivable due from affiliated companies	1,454	807
Accounts payable due to affiliated companies	552	244
Chevron's loan to affiliates	4,704	5,153	4,331
Affiliated Entity | Oil and Gas, Purchased
Variable Interest Entity [Line Items]
Purchased crude oil and products	$ 5,778	$ 3,003	$ 5,694
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	$ 4,500
Petropiar
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	30.00%
Petroboscan
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	39.20%
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%
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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