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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 468	$ 506
Americas
Disaggregation of Revenue [Line Items]
Revenue	269	264
EMEA
Disaggregation of Revenue [Line Items]
Revenue	113	149
APAC
Disaggregation of Revenue [Line Items]
Revenue	86	93
Recurring
Disaggregation of Revenue [Line Items]
Revenue	331	302
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	213	194
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	73	67
Recurring | APAC
Disaggregation of Revenue [Line Items]
Revenue	45	42
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	31	69
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue	19	22
Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue	7	33
Perpetual software licenses and hardware | APAC
Disaggregation of Revenue [Line Items]
Revenue	5	14
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	37	48
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	33	49
Consulting services | APAC
Disaggregation of Revenue [Line Items]
Revenue	$ 36	$ 37

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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

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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