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Acquisitions and Divestitures (Summary of Intangible Assts Acquired) (Details) - Pure Technologies Ltd - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 31, 2018	Oct. 31, 2016
Business Acquisition [Line Items]
Intangible assets		$ 148	$ 148
Customer Relationships
Business Acquisition [Line Items]
Weighted-average useful life	18 years
Intangible assets			83
Technology
Business Acquisition [Line Items]
Intangible assets			37
Technology | Minimum
Business Acquisition [Line Items]
Weighted-average useful life	3 years
Technology | Maximum
Business Acquisition [Line Items]
Weighted-average useful life	10 years
Tradenames
Business Acquisition [Line Items]
Weighted-average useful life	17 years
Intangible assets			22
Internally Developed Software
Business Acquisition [Line Items]
Intangible assets			$ 6
Internally Developed Software | Minimum
Business Acquisition [Line Items]
Weighted-average useful life	3 years

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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