Natural Gas and Oil Property Transactions - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		4 Months Ended	6 Months Ended
	Apr. 28, 2023	Mar. 20, 2023	Mar. 25, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Feb. 28, 2023	Jan. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on natural gas and oil derivatives				$ (159)	$ 514		$ (1,089)	$ 2,639
Costs and expenses				1,374	2,179		2,924	3,908
Funds held for transition services							97	0
Natural gas, oil and NGL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue				649	$ 2,790		2,102	$ 4,704
Marcellus
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on natural gas and oil derivatives						$ 312
Costs and expenses						178
Marcellus | Natural gas, oil and NGL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue						$ 473
Disposed of by Sale | Portion Of Eagle Ford Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration										$ 1,425
Purchase price		$ 225
Gain on sale of oil and natural gas properties		337
Property, plant and equipment											$ 811
Other assets held-for-sale											8
Derivative liabilities											65
Asset retirement obligations											57
Other liabilities											$ 22
Disposed of by Sale | Portion Of Eagle Ford Assets | Other Current Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration reflected with assets				56			56
Disposed of by Sale | Portion Of Eagle Ford Assets | Other Noncurrent Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration reflected with assets				128			128
Disposed of by Sale | Portion Of Remaining Eagle Ford Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration									$ 1,400
Purchase price	$ 225
Gain on sale of oil and natural gas properties	470
Asset retirement obligations	53
Funds held for transition services							97
Disposed of by Sale | Portion Of Remaining Eagle Ford Assets | Other Current Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration reflected with assets				53			53
Disposed of by Sale | Portion Of Remaining Eagle Ford Assets | Other Noncurrent Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration reflected with assets				$ 139			$ 139
Disposed of by Sale | Powder River Basin
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of oil and natural gas properties			$ 293
Proceeds from divestitures of property and equipment			450
Disposed of by Sale | Powder River Basin | Post-Close Adjustments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of oil and natural gas properties			$ 13
Disposed of by Sale | First Three Years | Portion Of Eagle Ford Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration paid in installments		60
Disposed of by Sale | Fourth Year | Portion Of Eagle Ford Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration paid in installments		$ 45
Disposed of by Sale | Next Four Years | Portion Of Remaining Eagle Ford Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred consideration paid in installments	$ 56