Debt - Summary of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Debt	$ 8,737	$ 7,584
Net Unamortized Discounts and Debt Issuance Costs	(64)	(65)
Total Debt	8,673	7,519
Finance Lease Obligations	(41)	(42)
Long-Term Debt Due After One Year	8,632	7,477
Noble Midstream Services Revolving Credit Facility
Debt Instrument [Line Items]
Available borrowing capacity	400	$ 555
Senior Notes and Debentures
Debt Instrument [Line Items]
Weighted average interest rate		4.93%
Noble Energy
Debt Instrument [Line Items]
Finance Lease Obligations	$ 203	$ 205
Finance Lease Obligations, Interest Rate	0.00%	0.00%
Total Debt	$ 7,087	$ 6,089
Noble Energy \| Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 1,000	$ 0
Interest Rate	1.92%	0.00%
Noble Energy \| Senior Notes and Debentures
Debt Instrument [Line Items]
Debt	$ 5,884	$ 5,884
Noble Midstream Partners
Debt Instrument [Line Items]
Total Debt	1,650	1,495
Noble Midstream Partners \| Revolving Credit Facility \| Noble Midstream Services Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 750	$ 595
Interest Rate	2.16%	3.11%
Noble Midstream Partners \| Revolving Credit Facility \| Noble Midstream Services Term Loan Credit Facility, due July 31, 2021
Debt Instrument [Line Items]
Debt	$ 500	$ 500
Interest Rate	1.94%	2.85%
Noble Midstream Partners \| Revolving Credit Facility \| Noble Midstream Services Term Loan Credit Facility, due August 23, 2022
Debt Instrument [Line Items]
Debt	$ 400	$ 400
Interest Rate	1.82%	2.74%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Weighted average discount rate for finance lease calculated at point in time.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, including portion classified as current.

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