Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / MMBTU	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Proceeds from issuance of mezzanine equity, net of offering costs		$ 97	$ 0	$ 0
Preferred stock, dividend rate, percentage		6.50%
Intangible assets, net		$ 278	$ 310
Intangible assets, accumulated amortization		$ 62
Long-term contract sales price per unit (usd per MMBtu) | $ / MMBTU		0.25
Operating lease, right-of-use asset		$ 227
Lease liabilities		$ 252
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Operating lease, right-of-use asset					$ 282
Lease liabilities					$ 287
Minimum
Property, Plant and Equipment [Line Items]
Useful lives of gathering facilitates and processing plants (in years)		3 years
Intangible asset, useful life		7 years
Lease renewal term		1 month
Maximum
Property, Plant and Equipment [Line Items]
Useful lives of gathering facilitates and processing plants (in years)		30 years
Intangible asset, useful life		13 years
Lease renewal term		1 year
Noble Midstream
Property, Plant and Equipment [Line Items]
Redeemable convertible preferred stock	$ 200
Proceeds from issuance of mezzanine equity, net of offering costs	100
Redeemable convertible preferred stock, remaining over next year	$ 100