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Investments and Advances - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Sales and other operating revenues	$ 184,432	$ 193,414	$ 196,913
Purchased crude oil and products	108,214	119,206	119,196
Accounts and notes receivable due from affiliated companies	913	1,258
Accounts payable due to affiliated companies	$ 764	556
Percentage of affiliate by summarized financial information	100.00%
Affiliated Entity [Member]
Variable Interest Entity [Line Items]
Chevron's loan to affiliates	$ 4,077	4,731	4,494
Sales and other operating revenues	12,563	13,850	13,623
Affiliated Entity [Member] \| Oil and Gas, Purchased
Variable Interest Entity [Line Items]
Purchased crude oil and products	$ 7,322	$ 6,547	$ 7,404
Tengizchevroil
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Investment in vie higher than the amount of underlying equity in TCO’s	$ 62
Principal balance	$ 3,500
Caspian Pipeline Consortium [Member]
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%
Chevron Phillips Chemical Company LLC \| Affiliated Entity [Member]
Variable Interest Entity [Line Items]
Chevron's loan to affiliates	$ 969
Golden Triangle Polymers Project \| Chevron Phillips Chemical Company LLC
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	51.00%
GS Caltex Corporation
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%