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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Acquisitions and Divestitures - Narrative (Details) a in Thousands, shares in Millions, $ in Millions	1 Months Ended				3 Months Ended				6 Months Ended
	Feb. 28, 2019 USD ($) a MMBbls	Oct. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) shares	Jan. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2021	Dec. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Feb. 01, 2018 shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration					$ 699				$ 699			$ 286
Capital contributions					144				415	$ 0
Asset Impairments					0		$ 0		0	168
Cash consideration									0	(650)
Gain (loss) on divestiture					0		(78)		0	(666)
Proceeds from divestiture									123	$ 1,382
Intangible assets					294				294			310
Goodwill					$ 110				$ 110			$ 110
CONE Gathering LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on divestiture				$ (196)		$ (198)	$ (109)
Ownership				50.00%		22.30%								34.10%
Shares sold (in shares) \| shares						14.2	7.5
Proceeds from divestiture				$ 308		$ 248	$ 135
Noble Midstream \| Saddle Butte
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration				$ 681
Property, plant and equipment			$ 206					$ 206
Intangible assets			340					340
Goodwill			$ 110					$ 110
EPIC Y-Grade, LP \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Step acquisition, percentage acquired					15.00%				15.00%
Cash consideration					$ 227				$ 227
Capital contributions					$ 28
EPIC Crude Holdings, LP \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Step acquisition, percentage acquired					30.00%				30.00%
Capital contributions					$ 114
Delaware Crossing JV \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration					$ 39				$ 39
Pipeline capacity (in MBbl/d) \| MMBbls	160
Tamar and Dalit Fields
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest			32.50%					32.50%
CNX Midstream Partners
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity owned (units) \| shares														21.7
Saddle Butte \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest				54.40%
Disposed by sale \| Reeves County Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proved and unproved non-core acreage sold (in acres) \| a	13
Proceeds from divestitures	$ 131
Disposed by sale \| Gulf of Mexico Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total transaction value			$ 480					$ 480					$ 480
Retained transaction related obligations			$ 92					92
Asset Impairments								$ 168
Gain (loss) on divestiture							19
Proceeds from divestiture							$ 383
Disposed by sale \| Tamar and Dalit Fields
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage ownership sold			7.50%					7.50%
Cash consideration			$ 484
Shares received in divestiture (in shares) \| shares			38.5
Value of shares			$ 224
Gain (loss) on divestiture			(386)
Tax effect			$ 90
Payments for (Proceeds from) Investments		$ 163
Disposed by sale \| Southwest Royalties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale				$ 60
Scenario, Forecast \| Tamar and Dalit Fields
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest											25.00%