Long-Term Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance Lease Obligations	$ 205
Total Debt	7,584	$ 6,675
Net Unamortized Discounts and Debt Issuance Costs	(65)	(60)
Total Debt, Net of Unamortized Discounts and Debt Issuance Costs	7,519	6,615
Finance Lease Obligations	(42)
Finance Lease Obligations		(41)
Long-Term Debt Due After One Year	7,477	6,574
Noble Energy
Debt Instrument [Line Items]
Finance Lease Obligations	205
Finance Lease Obligations		223
Total Debt	6,089	6,115
Noble Energy \| Revolving Credit Facility \| Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	0	0
Noble Energy \| Commercial Paper
Debt Instrument [Line Items]
Debt	0	0
Noble Energy \| Senior Notes \| Senior Notes, due December 15, 2021
Debt Instrument [Line Items]
Debt	$ 0	$ 1,000
Interest Rate	0.00%	4.15%
Noble Energy \| Senior Notes \| Senior Notes, due October 15, 2023
Debt Instrument [Line Items]
Debt	$ 100	$ 100
Interest Rate	7.25%	7.25%
Noble Energy \| Senior Notes \| Senior Notes, due November 15, 2024
Debt Instrument [Line Items]
Debt	$ 650	$ 650
Interest Rate	3.90%	3.90%
Noble Energy \| Senior Notes \| Senior Notes, due April 1, 2027
Debt Instrument [Line Items]
Debt	$ 250	$ 250
Interest Rate	8.00%	8.00%
Noble Energy \| Senior Notes \| Senior Notes, due January 15, 2028
Debt Instrument [Line Items]
Debt	$ 600	$ 600
Interest Rate	3.85%	3.85%
Noble Energy \| Senior Notes \| Senior Notes, due October 15, 2029
Debt Instrument [Line Items]
Debt	$ 500	$ 0
Interest Rate	3.25%	0.00%
Noble Energy \| Senior Notes \| Senior Notes, due March 1, 2041
Debt Instrument [Line Items]
Debt	$ 850	$ 850
Interest Rate	6.00%	6.00%
Noble Energy \| Senior Notes \| Senior Notes, due November 15, 2043
Debt Instrument [Line Items]
Debt	$ 1,000	$ 1,000
Interest Rate	5.25%	5.25%
Noble Energy \| Senior Notes \| Senior Notes, due November 15, 2044
Debt Instrument [Line Items]
Debt	$ 850	$ 850
Interest Rate	5.05%	5.05%
Noble Energy \| Senior Notes \| Senior Notes, due August 15, 2047
Debt Instrument [Line Items]
Debt	$ 500	$ 500
Interest Rate	4.95%	4.95%
Noble Energy \| Senior Notes \| Senior Notes, due October 15, 2049
Debt Instrument [Line Items]
Debt	$ 500	$ 0
Interest Rate	4.20%	0.00%
Noble Energy \| Senior Notes \| Senior Debentures
Debt Instrument [Line Items]
Debt	$ 84	$ 92
Interest Rate	7.25%	7.13%
Noble Midstream
Debt Instrument [Line Items]
Total Debt	$ 1,495	$ 560
Noble Midstream \| Revolving Credit Facility \| Noble Midstream Services Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 595	$ 60
Interest Rate	3.11%	3.67%
Noble Midstream \| Revolving Credit Facility \| Noble Midstream Services Term Loan Credit Facility, due July 31, 2021
Debt Instrument [Line Items]
Debt	$ 500	$ 500
Interest Rate	2.85%	3.42%
Noble Midstream \| Revolving Credit Facility \| Noble Midstream Services Term Loan Credit Facility, due August 23, 2022
Debt Instrument [Line Items]
Debt	$ 400	$ 0
Interest Rate	2.74%	0.00%

Long-Term Debt, Gross And Lease Obligation, Including Current Maturities

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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

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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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