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Divestitures - Dispositions and Divestitures (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Dispositions
Proceeds from sales of assets		$ 83	$ 161
Held for sale | Other current assets
Dispositions
Assets classified as held for sale		$ 150
Subsequent event
Dispositions
Proceeds from sales of assets	$ 255

X

- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 10
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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