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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 459	$ 526	$ 1,405	$ 1,576
Americas
Disaggregation of Revenue [Line Items]
Revenue	256	277	794	828
EMEA
Disaggregation of Revenue [Line Items]
Revenue	118	139	353	415
APAC
Disaggregation of Revenue [Line Items]
Revenue	85	110	258	333
Recurring
Disaggregation of Revenue [Line Items]
Revenue	343	312	1,012	926
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	222	198	652	590
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	75	70	223	207
Recurring | APAC
Disaggregation of Revenue [Line Items]
Revenue	46	44	137	129
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	16	77	76	243
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue	0	31	31	93
Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue	12	26	29	69
Perpetual software licenses and hardware | APAC
Disaggregation of Revenue [Line Items]
Revenue	4	20	16	81
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	34	48	111	145
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	31	43	101	139
Consulting services | APAC
Disaggregation of Revenue [Line Items]
Revenue	$ 35	$ 46	$ 105	$ 123

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+ References

No definition available.

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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