Natural Gas and Oil Property Transactions - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		7 Months Ended	9 Months Ended
	Apr. 28, 2023	Mar. 20, 2023	Mar. 25, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Aug. 31, 2023	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				$ (106)	$ 1,029		$ (1,195)	$ 3,668
Costs and expenses				1,433	2,157		4,357	6,065
Funds held for transition services							91	0
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 (loss) on sale of oil and natural gas properties	470
Asset retirement obligations	53
Funds held for transition services							91
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				54			54
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				141			141
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 (loss) 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				57			57
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				132			132
Disposed of by Sale | Portion Eagle Ford Assets to SilverBow Resources, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, plant and equipment				510			510
Other assets held-for-sale				10			10
Asset retirement obligations				11			11
Disposed of by Sale | Portion Eagle Ford Assets to SilverBow Resources, Inc | Scenario, Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration									$ 700
Disposed of by Sale | Portion Eagle Ford Assets to SilverBow Resources, Inc | If Transaction Closes by 2023 and Satisfaction of Certain Commodity Price Are Met
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration									$ 50
Disposed of by Sale | Powder River Basin
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) 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 (loss) 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
Natural gas, oil and NGL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue				682	2,987		2,784	7,691
Natural gas, oil and NGL | Powder River Basin
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue								99
Marketing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue				$ 724	$ 1,206	$ 20	$ 1,987	$ 3,296
Marcellus
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on natural gas and oil derivatives						542
Costs and expenses						329
Marcellus | Natural gas, oil and NGL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue						$ 959