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Supplemental Information on Oil and Gas Operations (Unaudited) (Results Of Operations) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / Boe	Dec. 31, 2020 USD ($) $ / Boe	Dec. 31, 2019 USD ($) $ / Boe
Oil And Gas Exploration And Production Industries Disclosures [Abstract]
Oil, gas and NGL sales	$ 9,531	$ 2,695	$ 3,809
Production expenses	(2,131)	(1,123)	(1,197)
Exploration expenses	(14)	(167)	(58)
Depreciation, depletion and amortization	(2,050)	(1,207)	(1,398)
Asset dispositions	170		37
Asset impairments		(2,664)
Accretion of asset retirement obligations	(28)	(20)	(21)
Income tax expense	(1,238)		(270)
Results of operations	$ 4,240	$ (2,486)	$ 902
Depreciation, depletion and amortization per Boe | $ / Boe	9.83	9.90	11.72

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Amortization computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content.

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Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

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Accretion expense of asset retirement obligations related to oil and gas producing activities.

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Exploration costs from oil and gas producing activities.

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Income tax expense for oil and gas producing activities.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Total revenues from oil and gas producing activities.

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