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Acquisitions and Divestitures - Narrative (Details) a in Thousands, shares in Millions, $ in Millions	1 Months Ended					3 Months Ended				9 Months Ended
	Feb. 28, 2019 USD ($) a MMBbls	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) shares	Jan. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2021	Dec. 31, 2019	Mar. 31, 2019 USD ($)	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]
Capital contributions						$ 271				$ 686	$ 0
Cash consideration						959				959					$ 286
Asset Impairments						0	$ 0			0	168
Proceeds from divestiture										131	1,740
Gain (loss) on divestiture						0	193			0	859
Cash consideration										0	$ (653)
Intangible assets						286				286					310
Goodwill						110				$ 110					$ 110
CONE Gathering LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture					$ 308		248	$ 135
Gain (loss) on divestiture					196		$ 198	$ 109
Shares sold (in shares) \| shares							14.2	7.5
Greeley Crescent
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture			$ 64
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
Intangible assets					340
Goodwill					$ 110
EMED Pipeline BV
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital contributions						$ 185
Percentage acquired						25.00%				25.00%
EMG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage acquired						39.00%				39.00%
EPIC Y-Grade, LP \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital contributions						$ 46
Step acquisition, percentage acquired						15.00%				15.00%
Cash consideration														$ 227
EPIC Crude Holdings, LP \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital contributions						$ 168
Step acquisition, percentage acquired						30.00%				30.00%
Delaware Crossing JV \| Noble Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration						$ 53				$ 53
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
Proceeds from divestiture								$ 383
Gain (loss) on divestiture								$ (24)
Disposed by sale \| Tamar and Dalit Fields
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on divestiture				$ 376
Percentage ownership sold				7.50%					7.50%
Cash consideration				$ 484
Shares received in divestiture (in shares) \| shares				38.5
Value of shares				$ 224
Tax effect				$ 86
Proceeds from sale, net of expenses		$ 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 \| EMG Pipeline
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage acquired													10.00%
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%
CNX Midstream Partners \| CONE Gathering LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership			22.30%		50.00%		22.30%				22.30%						34.10%