ACQUISITIONS, GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in Goodwill Balances (Details) $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($)
Goodwill
Beginning balance	$ 70,438
Acquisitions	1,965
Dispositions, currency exchange and other	(69)
Ending balance	72,335
Power
Goodwill
Beginning balance	19,816
Acquisitions	50
Dispositions, currency exchange and other	237
Ending balance	20,103
Renewable Energy
Goodwill
Beginning balance	2,507
Acquisitions	1,165
Dispositions, currency exchange and other	126
Ending balance	3,799
Oil & Gas
Goodwill
Beginning balance	10,363
Acquisitions	0
Dispositions, currency exchange and other	93
Ending balance	10,457
Aviation
Goodwill
Beginning balance	9,455
Acquisitions	16
Dispositions, currency exchange and other	269
Ending balance	9,739
Healthcare
Goodwill
Beginning balance	17,424
Acquisitions	47
Dispositions, currency exchange and other	38
Ending balance	17,509
Transportation
Goodwill
Beginning balance	899
Acquisitions	0
Dispositions, currency exchange and other	7
Ending balance	906
Energy Connections & Lighting
Goodwill
Beginning balance	6,868
Acquisitions	0
Dispositions, currency exchange and other	(859)
Ending balance	6,009
Capital
Goodwill
Beginning balance	2,368
Acquisitions	0
Dispositions, currency exchange and other	1
Ending balance	2,369
Corporate
Goodwill
Beginning balance	739
Acquisitions	688
Dispositions, currency exchange and other	19
Ending balance	$ 1,446

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
-Subparagraph (a)
-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
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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