Segment Information - Operating Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	$ 1,173	$ 994
Income from Equity Method Investees and Other	60	42
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	53
Total	1,286	1,036
Lease Operating Expense	155	139
Production and Ad Valorem Taxes	54	41
Gathering, Transportation and Processing Expense	95	119
Other Royalty Expense	17	4
Total	321	303
DD&A	468	528
Asset Impairments	168	0
Gain on Divestitures	(588)	0
Purchased Oil and Gas	57	0
Loss on Commodity Derivative Instruments	79	(110)
Income (Loss) Before Income Taxes	543	59
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Income from Equity Method Investees and Other	0	0
Intersegment Revenues	(81)	(58)
Sales of Purchased Oil and Gas	0
Total	(81)	(58)
Lease Operating Expense	0	0
Production and Ad Valorem Taxes	0	0
Gathering, Transportation and Processing Expense	(53)	(38)
Other Royalty Expense	0	0
Total	(53)	(38)
DD&A	(3)	0
Asset Impairments	0
Gain on Divestitures	0
Purchased Oil and Gas	0
Loss on Commodity Derivative Instruments	0	0
Income (Loss) Before Income Taxes	(15)	(22)
Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Income from Equity Method Investees and Other	0	0
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	0
Total	0	0
Lease Operating Expense	0	0
Production and Ad Valorem Taxes	0	0
Gathering, Transportation and Processing Expense	0	0
Other Royalty Expense	0	0
Total	0	0
DD&A	11	10
Asset Impairments	0
Gain on Divestitures	0
Purchased Oil and Gas	0
Loss on Commodity Derivative Instruments	0	0
Income (Loss) Before Income Taxes	(174)	(176)
United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	948	770
Income from Equity Method Investees and Other	0	0
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	31
Total	979	770
Lease Operating Expense	126	108
Production and Ad Valorem Taxes	53	40
Gathering, Transportation and Processing Expense	128	142
Other Royalty Expense	17	4
Total	324	294
DD&A	404	459
Asset Impairments	168
Gain on Divestitures	(6)
Purchased Oil and Gas	36
Loss on Commodity Derivative Instruments	64	(102)
Income (Loss) Before Income Taxes	(43)	62
United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Income from Equity Method Investees and Other	25	14
Intersegment Revenues	81	58
Sales of Purchased Oil and Gas	22
Total	128	72
Lease Operating Expense	0	0
Production and Ad Valorem Taxes	1	1
Gathering, Transportation and Processing Expense	20	15
Other Royalty Expense	0	0
Total	21	16
DD&A	17	5
Asset Impairments	0
Gain on Divestitures	(196)
Purchased Oil and Gas	21
Loss on Commodity Derivative Instruments	0	0
Income (Loss) Before Income Taxes	247	49
Eastern Mediter- ranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	131	131
Income from Equity Method Investees and Other	0	0
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	0
Total	131	131
Lease Operating Expense	7	8
Production and Ad Valorem Taxes	0	0
Gathering, Transportation and Processing Expense	0	0
Other Royalty Expense	0	0
Total	7	8
DD&A	13	19
Asset Impairments	0
Gain on Divestitures	(386)
Purchased Oil and Gas	0
Loss on Commodity Derivative Instruments	0	0
Income (Loss) Before Income Taxes	473	101
West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	94	93
Income from Equity Method Investees and Other	35	28
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	0
Total	129	121
Lease Operating Expense	22	23
Production and Ad Valorem Taxes	0	0
Gathering, Transportation and Processing Expense	0	0
Other Royalty Expense	0	0
Total	22	23
DD&A	26	34
Asset Impairments	0
Gain on Divestitures	0
Purchased Oil and Gas	0
Loss on Commodity Derivative Instruments	15	(8)
Income (Loss) Before Income Taxes	64	66
Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Income from Equity Method Investees and Other	0	0
Intersegment Revenues	0	0
Sales of Purchased Oil and Gas	0
Total	0	0
Lease Operating Expense	0	0
Production and Ad Valorem Taxes	0	0
Gathering, Transportation and Processing Expense	0	0
Other Royalty Expense	0	0
Total	0	0
DD&A	0	1
Asset Impairments	0
Gain on Divestitures	0
Purchased Oil and Gas	0
Loss on Commodity Derivative Instruments	0	0
Income (Loss) Before Income Taxes	(9)	(21)
Crude Oil Sales [Member]
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	773	527
Crude Oil Sales [Member] \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Crude Oil Sales [Member] \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Crude Oil Sales [Member] \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	682	439
Crude Oil Sales [Member] \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Crude Oil Sales [Member] \| Eastern Mediter- ranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	2	1
Crude Oil Sales [Member] \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	89	87
Crude Oil Sales [Member] \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member]
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	146	105
NGL Sales [Member] \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member] \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member] \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	146	105
NGL Sales [Member] \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member] \| Eastern Mediter- ranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member] \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
NGL Sales [Member] \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Natural Gas Sales [Member]
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	254	362
Natural Gas Sales [Member] \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Natural Gas Sales [Member] \| Corporate
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Natural Gas Sales [Member] \| United States \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	120	226
Natural Gas Sales [Member] \| United States \| Noble Midstream
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	0	0
Natural Gas Sales [Member] \| Eastern Mediter- ranean \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	129	130
Natural Gas Sales [Member] \| West Africa \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	5	6
Natural Gas Sales [Member] \| Other Int'l \| Operating Segments
Segment Reporting Information [Line Items]
Total Crude Oil, NGL and Natural Gas Sales	$ 0	$ 0

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