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Property, Plant and Equipment (Table of Property and Equipment, net) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Property and equipment:
Proved		$ 28,407	$ 27,668
Unproved and properties under development		432	583
Total oil and gas		28,839	28,251
Less accumulated DD&A		(24,286)	(20,693)
Oil and gas property and equipment, net		4,553	7,558
Other property and equipment		1,746	1,725
Less accumulated DD&A		(743)	(690)
Other property and equipment, net	[1]	1,003	1,035
Total property and equipment, net		$ 5,556	$ 8,593
[1] $100 million and $80 million related to CDM in 2020 and 2019, respectively.

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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