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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,567	$ 12,562
Accumulated Amortization	3,213	2,707
Net Book Value	9,354	9,855
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,832	4,938
Accumulated Amortization	1,020	865
Net Book Value	3,812	4,073
Technology/Technical Know-How
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,634	3,655
Accumulated Amortization	1,078	835
Net Book Value	2,556	2,820
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,806	2,847
Accumulated Amortization	533	458
Net Book Value	2,273	2,389
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,295	1,122
Accumulated Amortization	582	549
Net Book Value	$ 713	$ 573

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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-Subparagraph (a)(1)
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