Revenue Recognition - Narrative (Details) $ in Millions		3 Months Ended	9 Months Ended
Jan. 01, 2018 USD ($)	Sep. 30, 2018 USD ($) country	Sep. 30, 2018 USD ($) country Rate
Disaggregation of Revenue [Line Items]
Number of countries in which entity operates \| country		85	85
Percentage of sales recognized as services over time (less than)		10.00%	10.00%
Contract liabilities	$ 381	$ 281	$ 281
Contract liabilities, recognized in sales		$ 43	$ 201
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Cumulative effect on retained earnings, net of tax	$ 64

Percentage of Service Revenue Recognize over Time

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794

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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.

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- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

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