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Long-Term Debt - Summary (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Long-Term Debt - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 15, 2017
Debt Instrument [Line Items]
Debt	$ 6,859	$ 6,859	$ 7,114
Unamortized Discount	(24)	(24)	(23)
Unamortized Premium	12	12	17
Unamortized Debt Issuance Costs	(40)	(40)	(34)
Total Debt, Net of Discount	6,807	6,807	7,074
Capital Lease Obligations, Current	(61)	(61)	(63)
Long-Term Debt Due After One Year	6,746	6,746	7,011
Repayments of term loan facility		240	0	$ 0
Repayments of senior debt		1,114	1,383	$ 12
Revolving Credit Facility, due August 27, 2020
Debt Instrument [Line Items]
Debt	$ 230	$ 230	$ 0
Interest Rate	2.27%	2.27%	0.00%
Noble Midstream Services Revolving Credit Facility, due September 20, 2021
Debt Instrument [Line Items]
Debt	$ 85	$ 85	$ 0
Interest Rate	2.49%	2.49%	0.00%
Term Loan Facility, due January 6, 2019
Debt Instrument [Line Items]
Debt	$ 0	$ 0	$ 550
Interest Rate	0.00%	0.00%	2.01%
Repayments of term loan facility	$ 550
Leviathan Term Loan Facility, due February 23, 2025
Debt Instrument [Line Items]
Debt	$ 0	$ 0	$ 0
Interest Rate	0.00%	0.00%	0.00%
Senior Notes, due March 1, 2019
Debt Instrument [Line Items]
Debt	$ 0	$ 0	$ 1,000
Interest Rate	0.00%	0.00%	8.25%		8.25%
Senior Notes, due May 1, 2021
Debt Instrument [Line Items]
Debt	$ 379	$ 379	$ 379
Interest Rate	5.625%	5.625%	5.625%
Senior Notes, due December 15, 2021
Debt Instrument [Line Items]
Debt	$ 1,000	$ 1,000	$ 1,000
Interest Rate	4.15%	4.15%	4.15%
Senior Notes, due June 1, 2022
Debt Instrument [Line Items]
Debt	$ 0	$ 0	$ 18
Interest Rate	0.00%	0.00%	5.875%
Repayments of senior debt	$ 18
Senior Notes due October 15, 2023
Debt Instrument [Line Items]
Debt	$ 100	$ 100	$ 100
Interest Rate	7.25%	7.25%	7.25%
Senior Notes Due November 15, 2024
Debt Instrument [Line Items]
Debt	$ 650	$ 650	$ 650
Interest Rate	3.90%	3.90%	3.90%
Senior Notes, due April 1, 2027
Debt Instrument [Line Items]
Debt	$ 250	$ 250	$ 250
Interest Rate	8.00%	8.00%	8.00%
Senior Notes, due January 15, 2028
Debt Instrument [Line Items]
Debt	$ 600	$ 600	$ 0
Interest Rate	3.85%	3.85%	0.00%
Senior Notes, due March 1, 2041
Debt Instrument [Line Items]
Debt	$ 850	$ 850	$ 850
Interest Rate	6.00%	6.00%	6.00%
Senior Notes, due November 15, 2043
Debt Instrument [Line Items]
Debt	$ 1,000	$ 1,000	$ 1,000
Interest Rate	5.25%	5.25%	5.25%
Senior Notes, due November 15, 2044
Debt Instrument [Line Items]
Debt	$ 850	$ 850	$ 850
Interest Rate	5.05%	5.05%	5.05%
Senior Notes, due August 15, 2047
Debt Instrument [Line Items]
Debt	$ 500	$ 500	$ 0
Interest Rate	4.95%	4.95%	0.00%		4.95%
Other Senior Notes and Debentures
Debt Instrument [Line Items]
Debt	$ 92	$ 92	$ 92
Interest Rate	7.13043%	7.13043%	7.13043%
Capital Lease and Other Obligations
Debt Instrument [Line Items]
Capital Lease Obligations	$ 273	$ 273	$ 375
Interest Rate	0.00%	0.00%	0.00%
Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Debt	$ 8	$ 8
Senior Debentures due August 1, 2097
Debt Instrument [Line Items]
Debt	$ 84	$ 84
Senior Notes due June 1, 2022, June 1, 2024 and Senior Debentures due August 1, 2097
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	7.13%	7.13%
Marcellus Shale \| Capital Lease and Other Obligations
Debt Instrument [Line Items]
Debt	$ 41	$ 41
Capital lease principal payments		$ 60