Other Contingencies and Commitments (Details) bbl / d in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) bbl / d Location guaranty	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2009 USD ($)
Guarantees
Number of guarantees | guaranty	2
Guarantee for payments under terminal use agreements	$ 704,000,000
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 2020	900,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2021	1,100,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2022	1,100,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2023	1,200,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2024	1,200,000,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2025 and after	7,200,000,000
Total payments under long term unconditional purchase obligations and commitments including throughput and Take-or-Pay agreements	800,000,000	$ 1,400,000,000	$ 1,300,000,000
Environmental
Environmental reserve balance	$ 1,234,000,000
Sites with potential remediation activities (in sites) | Location	145
Investments in equity affiliates	$ 38,688,000,000	$ 35,546,000,000
Sites with Potential Remediation Activities
Environmental
Environmental reserve	266,000,000
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities
Environmental
Environmental reserve	968,000,000
Other Businesses
Environmental
Environmental reserve	1,000,000
Upstream
Environmental
Environmental reserve	272,000,000
United States | Downstream
Environmental
Environmental reserve	667,000,000
International | Downstream
Environmental
Environmental reserve	$ 28,000,000
Venezuela
Environmental
Oil production in barrels | bbl / d	35
Investments in equity affiliates	$ 2,650,000,000
Recognized losses	$ 54,000,000
Venezuela | Synthetic Oil
Environmental
Oil production in barrels | bbl / d	3
Financing Arrangement
Guarantees
Guarantee for payments under terminal use agreements	$ 412,000,000
Term of guarantee for payments under terminal use agreement (in years)	2 years
Affiliates
Guarantees
Guarantee for payments under terminal use agreements	$ 292,000,000
Term of guarantee for payments under terminal use agreement (in years)	8 years