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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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