Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Other Commitments [Line Items]
Total financial commitment			$ 1,000,000
Proceeds from issuance of mezzanine equity, net of offering costs			$ 97,000	$ 0	$ 0
Noble Midstream
Other Commitments [Line Items]
Redeemable convertible preferred stock		$ 200,000
Proceeds from issuance of mezzanine equity, net of offering costs		100,000
Redeemable convertible preferred stock, remaining over next year		$ 100,000
Minimum
Other Commitments [Line Items]
Term			3 years
Maximum
Other Commitments [Line Items]
Term			14 years
Colorado Water Quality Control Division Matter
Other Commitments [Line Items]
Environmental remediation expense	$ 57
State-Managed Supplemental Environmental Project
Other Commitments [Line Items]
Environmental remediation expense	$ 126
Consent Decree
Other Commitments [Line Items]
Corrective actions						$ 5,000
Mitigation projects						4,000
Supplemental environmental projects						$ 4,000
US Onshore And Eastern Mediterranean Agreements
Other Commitments [Line Items]
Total financial commitment			$ 921,000
US Onshore And Eastern Mediterranean Agreements | Minimum
Other Commitments [Line Items]
Term			1 year
US Onshore And Eastern Mediterranean Agreements | Maximum
Other Commitments [Line Items]
Term			12 years