Debt - Summary of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total	$ 6,663	$ 6,859
Unamortized Discount	(23)	(24)
Unamortized Premium	0	12
Unamortized Debt Issuance Costs	(38)	(40)
Total Debt, Net of Unamortized Discount, Premium and Debt Issuance Costs	6,602	6,807
Capital Lease Obligations	(47)	(61)
Long-Term Debt Due After One Year	6,555	6,746
Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 0	$ 230
Interest Rate	0.00%	2.27%
Noble Midstream Services Revolving Credit Facility, due March 9, 2023
Debt Instrument [Line Items]
Debt	$ 530	$ 85
Interest Rate	3.25%	2.75%
Leviathan Term Loan Facility, due February 23, 2025
Debt Instrument [Line Items]
Debt	$ 0	$ 0
Interest Rate	0.00%	0.00%
Senior Notes, due May 1, 2021
Debt Instrument [Line Items]
Debt	$ 0	$ 379
Interest Rate	0.00%	5.63%
Senior Notes, due December 15, 2021
Debt Instrument [Line Items]
Debt	$ 1,000	$ 1,000
Interest Rate	4.15%	4.15%
Senior Notes, due October 15, 2023
Debt Instrument [Line Items]
Debt	$ 100	$ 100
Interest Rate	7.25%	7.25%
Senior Notes, due November 15, 2024
Debt Instrument [Line Items]
Debt	$ 650	$ 650
Interest Rate	3.90%	3.90%
Senior Notes, due April 1, 2027
Debt Instrument [Line Items]
Debt	$ 250	$ 250
Interest Rate	8.00%	8.00%
Senior Notes, due January 15, 2028
Debt Instrument [Line Items]
Debt	$ 600	$ 600
Interest Rate	3.85%	3.85%
Senior Notes, due March 1, 2041
Debt Instrument [Line Items]
Debt	$ 850	$ 850
Interest Rate	6.00%	6.00%
Senior Notes, due November 15, 2043
Debt Instrument [Line Items]
Debt	$ 1,000	$ 1,000
Interest Rate	5.25%	5.25%
Senior Notes, due November 15, 2044
Debt Instrument [Line Items]
Debt	$ 850	$ 850
Interest Rate	5.05%	5.05%
Senior Notes, due August 15, 2047
Debt Instrument [Line Items]
Debt	$ 500	$ 500
Interest Rate	4.95%	4.95%
Other Senior Notes and Debentures
Debt Instrument [Line Items]
Debt	$ 92	$ 92
Interest Rate	7.13%	7.13%
Capital Lease Obligations
Debt Instrument [Line Items]
Interest Rate	0.00%	0.00%
Capital Lease Obligations	$ 241	$ 273
Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Debt	8
Senior Debentures due August 1, 2097
Debt Instrument [Line Items]
Debt	$ 84

Long-Term Debt and Capital Leases, Net of Debt Issuance Costs

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- Definition

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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- Definition

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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- Definition

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, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt premium.

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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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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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