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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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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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Debt (Details) - USD ($)	3 Months Ended				6 Months Ended		12 Months Ended
Debt (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Apr. 24, 2017	Feb. 24, 2017
Debt Instrument [Line Items]
Debt	$ 7,236,000,000	$ 7,114,000,000			$ 7,236,000,000		$ 7,114,000,000
Unamortized Discount	(22,000,000)	(23,000,000)			(22,000,000)		(23,000,000)
Unamortized Premium	15,000,000	17,000,000			15,000,000		17,000,000
Unamortized Debt Issuance Costs	(32,000,000)	(34,000,000)			(32,000,000)		(34,000,000)
Total Debt, Net of Unamortized Discount, Premium and Debt Issuance Costs	7,197,000,000	7,074,000,000			7,197,000,000		7,074,000,000
Capital Lease Obligations	(64,000,000)	(63,000,000)			(64,000,000)		(63,000,000)
Long-Term Debt Due After One Year	7,133,000,000	7,011,000,000			7,133,000,000		7,011,000,000
Rate at period end								2.02%
Borrowings					195,000,000	$ 0
Gain on tendered offers	0		$ 0		0	80,000,000
Repayments		850,000,000			$ 1,310,000,000	$ 0
Noble Midstream \| Revolving Credit Facility, due August 27, 2020
Debt Instrument [Line Items]
Maximum borrowing capacity		350,000,000					350,000,000
Noble Midstream \| Revolving Credit Facility, due August 27, 2020 \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, variable rate					0.50%
Noble Midstream \| Revolving Credit Facility, due August 27, 2020 \| 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	$ 0	$ 0			$ 0		$ 0
Interest Rate	0.00%	0.00%			0.00%		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	$ 190,000,000	$ 0			$ 190,000,000		$ 0
Interest Rate	2.32%	0.00%			2.32%		0.00%
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 \| Revolving Credit Facility, due August 27, 2020
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 \| Revolving Credit Facility, due August 27, 2020 \| LIBOR Prior to Production Startup
Debt Instrument [Line Items]
Debt instrument, variable rate					3.50%
Leviathan Term Loan Facility, due February 23, 2025 \| Revolving Credit Facility, due August 27, 2020 \| 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 \| Revolving Credit Facility, due August 27, 2020 \| LIBOR Last Two Years Until Maturity
Debt Instrument [Line Items]
Debt instrument, variable rate					3.75%
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	2.44%	2.01%			2.44%		2.01%
Maximum borrowing capacity		$ 1,400,000,000					$ 1,400,000,000
Term Loan Facility, due January 6, 2019 \| Revolving Credit Facility, due August 27, 2020
Debt Instrument [Line Items]
Term							3 years
Borrowings							$ 1,380,000,000
Term Loan Facility, due January 6, 2019 \| Revolving Credit Facility, due August 27, 2020 \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Debt instrument, variable rate					0.50%
Term Loan Facility, due January 6, 2019 \| Revolving Credit Facility, due August 27, 2020 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, variable rate					1.00%
8.25% Senior Notes, due March 1, 2019
Debt Instrument [Line Items]
Debt	$ 1,000,000,000	$ 1,000,000,000			$ 1,000,000,000		$ 1,000,000,000
Interest Rate	8.25%	8.25%			8.25%		8.25%
Stated rate	8.25%				8.25%
5.625% 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%
Stated rate	5.625%				5.625%
4.15% 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%
Stated rate	4.15%				4.15%
5.875% Senior Notes, due June 1, 2022
Debt Instrument [Line Items]
Debt	$ 18,000,000	$ 18,000,000			$ 18,000,000		$ 18,000,000
Interest Rate	5.875%	5.875%			5.875%		5.875%
Stated rate	5.875%				5.875%
7.25% 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%
Stated rate	7.25%				7.25%
5.875% Senior Notes, due June 1, 2024
Debt Instrument [Line Items]
Debt	$ 8,000,000	$ 8,000,000			$ 8,000,000		$ 8,000,000
Interest Rate	5.875%	5.875%			5.875%		5.875%
Stated rate	5.875%				5.875%
3.90% 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%
Stated rate	3.90%				3.90%
8.00% 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%
Stated rate	8.00%				8.00%
6.00% 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%
Stated rate	6.00%				6.00%
5.25% 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%
Stated rate	5.25%				5.25%
5.05% 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%
Stated rate	5.05%				5.05%
7.25% Senior Debentures, due August 1, 2097
Debt Instrument [Line Items]
Debt	$ 84,000,000	$ 84,000,000			$ 84,000,000		$ 84,000,000
Interest Rate	7.25%	7.25%			7.25%		7.25%
Stated rate	7.25%				7.25%
Capital Lease and Other Obligations
Debt Instrument [Line Items]
Debt	$ 307,000,000	$ 375,000,000			$ 307,000,000		$ 375,000,000
Interest Rate	0.00%	0.00%			0.00%		0.00%
Credit Facility \| Revolving Credit Facility, due August 27, 2020
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%
Credit Facility \| Revolving Credit Facility, due August 27, 2020 \| 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%
Credit Facility \| Other Operating Income (Expense) \| Revolving Credit Facility, due August 27, 2020
Debt Instrument [Line Items]
Gain on tendered offers				$ 80,000,000
Marcellus Shale \| Capital Lease and Other Obligations
Debt Instrument [Line Items]
Debt	$ 41,000,000				$ 41,000,000