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Property, Plant and Equipment (Table of Property and Equipment, net) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Property and equipment:
Proved	$ 41,155	$ 40,378
Unproved and properties under development	770	833
Total oil and gas	41,925	41,211
Less accumulated DD&A	(32,938)	(32,229)
Oil and gas property and equipment, net	8,987	8,982
Other property and equipment	1,735	1,707
Less accumulated DD&A	(685)	(663)
Other property and equipment, net	1,050	1,044
Total property and equipment, net	$ 10,037	$ 10,026

X

- Definition

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, gross, carried under the successful effort method.

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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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Oil and Gas properties with proved reserves under the successful effort method.

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