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Business Acquisition - Estimated fair value and average life (Details) - USD ($) $ in Millions		6 Months Ended
	Jul. 03, 2017	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Other intangible assets, net		$ 5,973	$ 6,358
Minimum
Business Acquisition [Line Items]
Estimated useful lives		1 year
Maximum
Business Acquisition [Line Items]
Estimated useful lives		30 years
GE Transaction Agreement
Business Acquisition [Line Items]
Other intangible assets, net	$ 4,005
Customer relationships | GE Transaction Agreement
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,240
Estimated useful lives	15 years
Patents and technology | GE Transaction Agreement
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 465
Estimated useful lives	10 years
Capitalized software | GE Transaction Agreement
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 64
Estimated useful lives	2 years
Trade names - other | GE Transaction Agreement
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 45
Estimated useful lives	10 years
Favorable lease contracts & others | GE Transaction Agreement
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 21
Estimated useful lives	10 years
Trade names and trademarks | GE Transaction Agreement
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 2,100
In-process research and development | GE Transaction Agreement
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 70

X

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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