Debt - Summary of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance Lease Obligations	$ 215	$ 223
Finance Lease Obligations, Interest Rate	0.00%	0.00%
Total	$ 6,837	$ 6,675
Net Unamortized Discounts and Debt Issuance Costs	(58)	(60)
Total Debt	6,779	6,615
Finance Lease Obligations	(41)	(41)
Long-Term Debt Due After One Year	6,738	6,574
Revolving Credit Facility, due March 9 2023
Debt Instrument [Line Items]
Debt	$ 0	$ 0
Interest Rate	0.00%	0.00%
Maximum borrowing capacity	$ 4,000
Noble Midstream Services Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	800
Available borrowing capacity	570	$ 740
Revolving Credit Facility \| Noble Midstream Services Revolving Credit Facility Due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 230	$ 60
Interest Rate	3.66%	3.67%
Revolving Credit Facility \| Noble Midstream Services Term Loan Credit Facility, due July 31, 2021
Debt Instrument [Line Items]
Debt	$ 500	$ 500
Interest Rate	3.41%	3.42%
Senior Notes and Debentures
Debt Instrument [Line Items]
Debt	$ 5,892	$ 5,892
Weighted average interest rate	5.01%	5.01%

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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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 capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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