Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Balance at December 31, 2016, gross			$ 10,434
Goodwill impairment			(3,754)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	$ 19,927	$ 6,680
Goodwill, acquisition		13,052
Goodwill, currency exchange and others	(80)	195
Goodwill, net, ending balance	20,758	19,927
Operating segments \| Oilfield Services
Goodwill [Line Items]
Balance at December 31, 2016, gross			2,779
Goodwill impairment			(2,633)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	13,205	146
Goodwill, acquisition		13,052
Goodwill, currency exchange and others	(16)	7
Goodwill, purchase accounting adjustments	(154)
Goodwill, net, ending balance	13,035	13,205
Operating segments \| Oilfield Equipment
Goodwill [Line Items]
Balance at December 31, 2016, gross			3,852
Goodwill impairment			(867)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	3,034	2,985
Goodwill, acquisition		0
Goodwill, currency exchange and others	(36)	49
Goodwill, purchase accounting adjustments	242
Goodwill, net, ending balance	3,240	3,034
Operating segments \| Turbomachinery & Process Solutions
Goodwill [Line Items]
Balance at December 31, 2016, gross			1,814
Goodwill impairment			0
Goodwill [Roll Forward]
Goodwill, net, beginning balance	1,906	1,814
Goodwill, acquisition		0
Goodwill, currency exchange and others	(23)	92
Goodwill, purchase accounting adjustments	394
Goodwill, net, ending balance	2,277	1,906
Operating segments \| Digital Solutions
Goodwill [Line Items]
Balance at December 31, 2016, gross			1,989
Goodwill impairment			$ (254)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	1,782	1,735
Goodwill, acquisition		0
Goodwill, currency exchange and others	(5)	47
Goodwill, purchase accounting adjustments	429
Goodwill, net, ending balance	2,206	$ 1,782
GE Transaction Agreement
Goodwill [Roll Forward]
Goodwill, purchase accounting adjustments	911
GE Transaction Agreement \| Operating segments
Goodwill [Roll Forward]
Goodwill, acquisition	13,963
GE Transaction Agreement \| Operating segments \| Oilfield Services
Goodwill [Roll Forward]
Goodwill, acquisition	$ 12,898