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Debt (Details) - USD ($)		3 Months Ended				9 Months Ended		12 Months Ended
Debt (Details) - USD ($)	Aug. 15, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Feb. 24, 2017
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities		$ 7,604,000,000	$ 7,114,000,000			$ 7,604,000,000		$ 7,114,000,000
Unamortized Discount		(25,000,000)	(23,000,000)			(25,000,000)		(23,000,000)
Unamortized Premium		14,000,000	17,000,000			14,000,000		17,000,000
Unamortized Debt Issuance Costs		(41,000,000)	(34,000,000)			(41,000,000)		(34,000,000)
Total Debt, Net of Unamortized Discount, Premium and Debt Issuance Costs		7,552,000,000	7,074,000,000			7,552,000,000		7,074,000,000
Capital Lease Obligations		(65,000,000)	(63,000,000)			(65,000,000)		(63,000,000)
Long-Term Debt Due After One Year		7,487,000,000	7,011,000,000			7,487,000,000		7,011,000,000
Proceeds from Issuance of Senior Notes, Net						1,086,000,000	$ 0
Borrowings						245,000,000	0
Loss (Gain) on Extinguishment of Debt		98,000,000		$ 0		98,000,000	(80,000,000)
Repayments			850,000,000			$ 1,310,000,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Unamortized Discount	$ (4,000,000)
Debt issuance costs, gross	11,000,000
Proceeds from Issuance of Senior Notes, Net	$ 1,100,000,000
Loss on debt refinance		98,000,000
Noble Midstream \| Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			350,000,000					350,000,000
Noble Midstream \| Line of Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, variable rate						0.50%
Noble Midstream \| Line of Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, variable rate						1.00%
Clayton Williams Energy
Debt Instrument [Line Items]
Credit facility draw									$ 1,300,000,000
Revolving Credit Facility, due August 27, 2020
Debt Instrument [Line Items]
Debt		$ 275,000,000	$ 0			$ 275,000,000		$ 0
Interest rate		2.27%	0.00%			2.27%		0.00%
Maximum borrowing capacity		$ 4,000,000,000				$ 4,000,000,000
Credit facility fee rate basis points, minimum		0.10%				0.10%
Credit facility fee rate basis points, maximum		0.25%				0.25%
Credit facility interest rate, Eurodollar rate plus, minimum		0.90%				0.90%
Credit facility interest rate, Eurodollar rate plus, maximum		1.50%				1.50%
Noble Midstream Services Revolving Credit Facility, due September 20, 2021
Debt Instrument [Line Items]
Debt		$ 200,000,000	$ 0			$ 200,000,000		$ 0
Interest rate		2.45%	0.00%			2.45%		0.00%
Noble Midstream Services Revolving Credit Facility, due September 20, 2021 \| Noble Midstream
Debt Instrument [Line Items]
Debt		$ 200,000,000				$ 200,000,000
Term Loan Facility, due January 6, 2019
Debt Instrument [Line Items]
Debt		$ 550,000,000	$ 550,000,000			$ 550,000,000		$ 550,000,000
Interest rate		2.45%	2.01%			2.45%		2.01%
Maximum borrowing capacity			$ 1,400,000,000					$ 1,400,000,000
Term Loan Facility, due January 6, 2019 \| Line of Credit Facility
Debt Instrument [Line Items]
Credit facility fee rate basis points, minimum		0.10%				0.10%
Credit facility fee rate basis points, maximum		0.75%				0.75%
Term								3 years
Borrowings								$ 1,380,000,000
Term Loan Facility, due January 6, 2019 \| Line of Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, variable rate						0.50%
Term Loan Facility, due January 6, 2019 \| Line of Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Credit facility interest rate, Eurodollar rate plus, minimum		1.00%				1.00%
Credit facility interest rate, Eurodollar rate plus, maximum		1.75%				1.75%
Debt instrument, variable rate						1.00%
Term Loan Facility, due January 6, 2019 \| Other Operating Income (Expense) \| Line of Credit Facility
Debt Instrument [Line Items]
Loss (Gain) on Extinguishment of Debt					$ (80,000,000)
Leviathan Term Loan Facility, due February 23, 2025
Debt Instrument [Line Items]
Debt		$ 0	$ 0			$ 0		$ 0
Interest rate		0.00%	0.00%			0.00%		0.00%
Leviathan Term Loan Facility, due February 23, 2025 \| Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 1,000,000,000.0
Credit facility draw										$ 625,000,000
Maximum final balloon payment allowable						35.00%
Commitment fee						1.00%
Leviathan Term Loan Facility, due February 23, 2025 \| Line of Credit Facility \| LIBOR Prior to Production Startup
Debt Instrument [Line Items]
Debt instrument, variable rate						3.50%
Leviathan Term Loan Facility, due February 23, 2025 \| Line of Credit Facility \| LIBOR After Startup Prior to Two Years Before Maturity
Debt Instrument [Line Items]
Debt instrument, variable rate						3.25%
Leviathan Term Loan Facility, due February 23, 2025 \| Line of Credit Facility \| LIBOR Last Two Years Until Maturity
Debt Instrument [Line Items]
Debt instrument, variable rate						3.75%
Senior Notes, due March 1, 2019
Debt Instrument [Line Items]
Debt		$ 0	$ 1,000,000,000			$ 0		$ 1,000,000,000
Interest rate		0.00%	8.25%			0.00%		8.25%
Senior Notes, due March 1, 2019 \| Senior Notes
Debt Instrument [Line Items]
Interest rate	8.25%
Unamortized Premium	$ 96,000,000
Debt instrument, face amount	$ 1,000,000,000
Senior Notes, due May 1, 2021
Debt Instrument [Line Items]
Debt		$ 379,000,000	$ 379,000,000			$ 379,000,000		$ 379,000,000
Interest rate		5.625%	5.625%			5.625%		5.625%
Senior Notes, due December 15, 2021
Debt Instrument [Line Items]
Debt		$ 1,000,000,000	$ 1,000,000,000			$ 1,000,000,000		$ 1,000,000,000
Interest rate		4.15%	4.15%			4.15%		4.15%
Senior Notes due October 15, 2023
Debt Instrument [Line Items]
Debt		$ 100,000,000	$ 100,000,000			$ 100,000,000		$ 100,000,000
Interest rate		7.25%	7.25%			7.25%		7.25%
Senior Notes, due November 15, 2024
Debt Instrument [Line Items]
Debt		$ 650,000,000	$ 650,000,000			$ 650,000,000		$ 650,000,000
Interest rate		3.90%	3.90%			3.90%		3.90%
Senior Notes, due April 1, 2027
Debt Instrument [Line Items]
Debt		$ 250,000,000	$ 250,000,000			$ 250,000,000		$ 250,000,000
Interest rate		8.00%	8.00%			8.00%		8.00%
Senior Notes due January 15, 2028
Debt Instrument [Line Items]
Debt		$ 600,000,000	$ 0			$ 600,000,000		$ 0
Interest rate		3.85%	0.00%			3.85%		0.00%
Senior Notes due January 15, 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest rate	3.85%
Debt instrument, face amount	$ 600,000,000
Senior Notes, due March 1, 2041
Debt Instrument [Line Items]
Debt		$ 850,000,000	$ 850,000,000			$ 850,000,000		$ 850,000,000
Interest rate		6.00%	6.00%			6.00%		6.00%
Senior Notes, due November 15, 2043
Debt Instrument [Line Items]
Debt		$ 1,000,000,000	$ 1,000,000,000			$ 1,000,000,000		$ 1,000,000,000
Interest rate		5.25%	5.25%			5.25%		5.25%
Senior Notes, due November 15, 2044
Debt Instrument [Line Items]
Debt		$ 850,000,000	$ 850,000,000			$ 850,000,000		$ 850,000,000
Interest rate		5.05%	5.05%			5.05%		5.05%
Senior Notes due August 15, 2047
Debt Instrument [Line Items]
Debt		$ 500,000,000	$ 0			$ 500,000,000		$ 0
Interest rate		4.95%	0.00%			4.95%		0.00%
Senior Notes due August 15, 2047 \| Senior Notes
Debt Instrument [Line Items]
Interest rate	4.95%
Debt instrument, face amount	$ 500,000,000
Other Senior Notes and Debentures (2)
Debt Instrument [Line Items]
Debt		$ 110,000,000	$ 110,000,000			$ 110,000,000		$ 110,000,000
Interest rate		6.93%	6.93%			6.93%		6.93%
Capital Lease and Other Obligations
Debt Instrument [Line Items]
Interest rate		0.00%	0.00%			0.00%		0.00%
Capital Lease Obligations		$ 290,000,000	$ 375,000,000			$ 290,000,000		$ 375,000,000
Senior Notes, due June 1, 2022
Debt Instrument [Line Items]
Debt		18,000,000				18,000,000
Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Debt		8,000,000				8,000,000
Senior Debentures due August 1, 2097
Debt Instrument [Line Items]
Debt		$ 84,000,000				$ 84,000,000
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		6.93%				6.93%
Marcellus Shale \| Capital Lease and Other Obligations
Debt Instrument [Line Items]
Debt		$ 41,000,000				$ 41,000,000
Capital lease principal payments						$ 44,000,000