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Other Contingencies and Commitments (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) guaranty legal_matter Location	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2009 USD ($)
Guarantees
Number of guarantees | guaranty	2
Guarantee for payments under terminal use agreements	$ 391,000,000
Idemnifications
Indemnifications acquirer environmental liabilities, maximum obligation				$ 200,000,000
Long-Term Unconditional Purchase Obligations and Commitments, Including Throughput and Take-or-Pay Agreements
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2021	1,000,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2022	1,200,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2023	1,300,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2024	1,300,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2025	1,400,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2026 and after	8,400,000,000
Total payments under long term unconditional purchase obligations and commitments including throughput and Take-or-Pay agreements	500,000,000	$ 800,000,000	$ 1,400,000,000
Environmental
Environmental reserve balance	$ 1,139,000,000
Sites with potential remediation activities (in sites) | Location	145
Investments in equity affiliates	$ 39,052,000,000	$ 38,688,000,000
Sites with Potential Remediation Activities
Environmental
Environmental reserve	247,000,000
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities
Environmental
Environmental reserve	892,000,000
Other Businesses
Environmental
Environmental reserve	1,000,000
Upstream
Environmental
Environmental reserve	233,000,000
United States | Downstream
Environmental
Environmental reserve	611,000,000
International | Downstream
Environmental
Environmental reserve	$ 47,000,000
Louisiana | All Companies Served With Claim
Environmental
Pending lawsuits and claims (in number of claims) | legal_matter	43
Louisiana | Chevron USA Inc
Environmental
Pending lawsuits and claims (in number of claims) | legal_matter	39
Financing Arrangement
Guarantees
Guarantee for payments under terminal use agreements	$ 137,000,000
Term of guarantee for payments under terminal use agreement (in years)	1 year
Affiliates
Guarantees
Guarantee for payments under terminal use agreements	$ 254,000,000
Term of guarantee for payments under terminal use agreement (in years)	7 years

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