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Debt - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Debt - Narrative (Details) - USD ($)	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Commercial paper		$ 511,000,000
Commercial Paper
Debt Instrument [Line Items]
Borrowing capacity		4,000,000,000.0
Available borrowing capacity		3,500,000,000
Senior Notes October 2029
Debt Instrument [Line Items]
Borrowing capacity		$ 500,000,000
Interest Rate		3.25%
Senior Notes October 2049
Debt Instrument [Line Items]
Borrowing capacity		$ 500,000,000
Interest Rate		4.20%
Senior Notes December 2021
Debt Instrument [Line Items]
Interest Rate		4.15%
Debt redemption		$ 1,000,000,000.0
Scenario, Forecast
Debt Instrument [Line Items]
Debt extinguishment fees	$ 44,000,000
Revolving Credit Facility \| Noble Midstream \| Noble Midstream Services Term Loan Credit Facility, due August 23, 2022
Debt Instrument [Line Items]
Debt		$ 400,000,000
Interest Rate		3.05%	0.00%