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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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