Segment Information - Operating Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	$ 1,100	$ 1,017	$ 2,273	$ 2,011
Income from Equity Method Investees and Other	64	42	124	84
Sales of Purchased Oil and Gas	66	0	119	0
Intersegment Revenues	0	0	0	0
Total	1,230	1,059	2,516	2,095
Lease Operating Expense	132	124	287	263
Production and Ad Valorem Taxes	50	32	104	73
Gathering, Transportation and Processing Expense	100	121	195	240
Total	292	283	613	586
DD&A	465	503	933	1,031
Gain on Divestitures, Net	(78)	0	(666)	0
Asset Impairments	0	0	168	0
Purchased Oil and Gas	71	0	128	0
Loss on Marcellus Shale Upstream Divestiture		2,322		2,322
Loss (Gain) on Commodity Derivative Instruments	249	(57)	328	(167)
Income (Loss) Before Income Taxes	10	(2,334)	553	(2,275)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Income from Equity Method Investees and Other	0	0	0	0
Sales of Purchased Oil and Gas	0		0
Intersegment Revenues	(85)	(69)	(166)	(127)
Total	(85)	(69)	(166)	(127)
Lease Operating Expense	(6)	(5)	(6)	(2)
Production and Ad Valorem Taxes	0	0	0	0
Gathering, Transportation and Processing Expense	(55)	(38)	(108)	(72)
Total	(61)	(43)	(114)	(74)
DD&A	(4)	0	(8)	0
Gain on Divestitures, Net	0		0
Asset Impairments			0
Purchased Oil and Gas	0		0
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	0	0	0	0
Income (Loss) Before Income Taxes	(18)	(13)	(40)	(35)
Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Income from Equity Method Investees and Other	0	0	0	0
Sales of Purchased Oil and Gas	0		0
Intersegment Revenues	0	0	0	0
Total	0	0	0	0
Lease Operating Expense	0	0	0	0
Production and Ad Valorem Taxes	0	0	0	0
Gathering, Transportation and Processing Expense	0	0	0	0
Total	0	0	0	0
DD&A	12	12	23	22
Gain on Divestitures, Net	0		0
Asset Impairments			0
Purchased Oil and Gas	0		0
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	0	0	0	0
Income (Loss) Before Income Taxes	(154)	(234)	(328)	(430)
United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	870	780	1,818	1,550
Income from Equity Method Investees and Other	0	0	0	0
Sales of Purchased Oil and Gas	24		55
Intersegment Revenues	0	0	0	0
Total	894	780	1,873	1,550
Lease Operating Expense	114	105	240	211
Production and Ad Valorem Taxes	48	32	101	72
Gathering, Transportation and Processing Expense	133	142	260	280
Total	305	285	628	573
DD&A	394	427	800	886
Gain on Divestitures, Net	21		15
Asset Impairments			168
Purchased Oil and Gas	31		67
Loss on Marcellus Shale Upstream Divestiture		2,322		2,322
Loss (Gain) on Commodity Derivative Instruments	196	(51)	260	(154)
Income (Loss) Before Income Taxes	(90)	(2,319)	(127)	(2,251)
United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Income from Equity Method Investees and Other	28	17	53	32
Sales of Purchased Oil and Gas	42		64
Intersegment Revenues	85	69	166	127
Total	155	86	283	159
Lease Operating Expense	0	0	0	0
Production and Ad Valorem Taxes	2	0	3	1
Gathering, Transportation and Processing Expense	22	17	43	32
Total	24	17	46	33
DD&A	22	5	38	10
Gain on Divestitures, Net	(109)		(305)
Asset Impairments			0
Purchased Oil and Gas	40		61
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	0	0	0	0
Income (Loss) Before Income Taxes	175	58	428	107
Eastern Mediterranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	113	133	244	265
Income from Equity Method Investees and Other	0	0	0	0
Sales of Purchased Oil and Gas	0		0
Intersegment Revenues	0	0	0	0
Total	113	133	244	265
Lease Operating Expense	5	6	12	14
Production and Ad Valorem Taxes	0	0	0	0
Gathering, Transportation and Processing Expense	0	0	0	0
Total	5	6	12	14
DD&A	15	19	28	37
Gain on Divestitures, Net	10		(376)
Asset Impairments			0
Purchased Oil and Gas	0		0
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	0	0	0	0
Income (Loss) Before Income Taxes	62	106	535	207
West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	117	104	211	196
Income from Equity Method Investees and Other	36	25	71	52
Sales of Purchased Oil and Gas	0		0
Intersegment Revenues	0	0	0	0
Total	153	129	282	248
Lease Operating Expense	19	18	41	40
Production and Ad Valorem Taxes	0	0	0	0
Gathering, Transportation and Processing Expense	0	0	0	0
Total	19	18	41	40
DD&A	26	39	52	74
Gain on Divestitures, Net	0		0
Asset Impairments			0
Purchased Oil and Gas	0		0
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	53	(6)	68	(13)
Income (Loss) Before Income Taxes	48	72	112	138
Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Income from Equity Method Investees and Other	0	0	0	0
Sales of Purchased Oil and Gas	0		0
Intersegment Revenues	0	0	0	0
Total	0	0	0	0
Lease Operating Expense	0	0	0	0
Production and Ad Valorem Taxes	0	0	0	0
Gathering, Transportation and Processing Expense	0	0	0	0
Total	0	0	0	0
DD&A	0	1	0	2
Gain on Divestitures, Net	0		0
Asset Impairments			0
Purchased Oil and Gas	0		0
Loss on Marcellus Shale Upstream Divestiture		0		0
Loss (Gain) on Commodity Derivative Instruments	0	0	0	0
Income (Loss) Before Income Taxes	(13)	(4)	(27)	(11)
Crude Oil Sales
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	749	557	1,522	1,084
Crude Oil Sales \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Crude Oil Sales \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Crude Oil Sales \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	635	458	1,317	897
Crude Oil Sales \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Crude Oil Sales \| Eastern Mediterranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	2	1	4	2
Crude Oil Sales \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	112	98	201	185
Crude Oil Sales \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	137	108	283	213
NGL Sales \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	137	108	283	213
NGL Sales \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales \| Eastern Mediterranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
NGL Sales \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Natural Gas Sales
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	214	352	468	714
Natural Gas Sales \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Natural Gas Sales \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Natural Gas Sales \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	98	214	218	440
Natural Gas Sales \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Natural Gas Sales \| Eastern Mediterranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	111	132	240	263
Natural Gas Sales \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	5	6	10	11
Natural Gas Sales \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0	0	0
Other Royalty Expense
Segment Reporting Information [Line Items]
Expense	10	6	27	10
Other Royalty Expense \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Expense	0	0	0	0
Other Royalty Expense \| Corporate
Segment Reporting Information [Line Items]
Expense	0	0	0	0
Other Royalty Expense \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Expense	10	6	27	10
Other Royalty Expense \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Expense	0	0	0	0
Other Royalty Expense \| Eastern Mediterranean \| Operating Segments
Segment Reporting Information [Line Items]
Expense	0	0	0	0
Other Royalty Expense \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Expense	0	0	0	0
Other Royalty Expense \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Expense	$ 0	$ 0	$ 0	$ 0

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