Fair Value Measurements and Disclosures - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Mar. 25, 2019	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Redeemable Noncontrolling Interest, Net		$ 97	$ 97		$ 0
Proceeds from issuance of preferred equity			99	$ 0
Issuance costs of preferred equity		$ 3
Noble Midstream
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from issuance of preferred equity	$ 100
Issuance costs of preferred equity	$ 3
Marcellus Shale Firm Transportation Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Firm Transportation Exit Cost Accrual			$ 92	$ 0