Acquisitions, Goodwill and Other Intangible Assets (Changes in Goodwill Balances) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Changes in Goodwill Balances
Goodwill, Beginning Balance	$ 70,438
Acquisitions	731
Dispositions, currency exchange and other	(856)
Goodwill, Ending Balance	70,313	$ 70,438
Goodwill, Period Increase (Decrease)		(125)
Power
Changes in Goodwill Balances
Goodwill, Beginning Balance	19,816
Acquisitions	(6)
Dispositions, currency exchange and other	(14)
Goodwill, Ending Balance	19,796	19,816
Renewable Energy
Changes in Goodwill Balances
Goodwill, Beginning Balance	2,507
Acquisitions	0
Dispositions, currency exchange and other	63
Goodwill, Ending Balance	2,571	2,507
Oil & Gas
Changes in Goodwill Balances
Goodwill, Beginning Balance	10,363
Acquisitions	0
Dispositions, currency exchange and other	6
Goodwill, Ending Balance	10,369	10,363
Aviation
Changes in Goodwill Balances
Goodwill, Beginning Balance	9,455
Acquisitions	10
Dispositions, currency exchange and other	114
Goodwill, Ending Balance	9,578	9,455
Healthcare
Changes in Goodwill Balances
Goodwill, Beginning Balance	17,424
Acquisitions	37
Dispositions, currency exchange and other	(4)
Goodwill, Ending Balance	17,457	17,424
Transporation
Changes in Goodwill Balances
Goodwill, Beginning Balance	899
Acquisitions	0
Dispositions, currency exchange and other	7
Goodwill, Ending Balance	906	899
Energy Connections & Lighting
Changes in Goodwill Balances
Goodwill, Beginning Balance	6,868
Acquisitions	0
Dispositions, currency exchange and other	(1,046)
Goodwill, Ending Balance	5,822	6,868
Capital
Changes in Goodwill Balances
Goodwill, Beginning Balance	2,368
Acquisitions	0
Dispositions, currency exchange and other	0
Goodwill, Ending Balance	2,368	2,368
Corporate
Changes in Goodwill Balances
Goodwill, Beginning Balance	739
Acquisitions	689
Dispositions, currency exchange and other	19
Goodwill, Ending Balance	$ 1,446	$ 739

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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