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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue	$ 588	$ 526	$ 544	$ 506	$ 626	$ 526	$ 513	$ 491	$ 2,164	$ 2,156	$ 2,322
Americas
Disaggregation of Revenue [Line Items]
Revenue									1,126
International
Disaggregation of Revenue [Line Items]
Revenue									1,038	960	953
Recurring
Disaggregation of Revenue [Line Items]
Revenue									1,254	1,145	1,135
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue									801
Recurring | International
Disaggregation of Revenue [Line Items]
Revenue									453
Hardware
Disaggregation of Revenue [Line Items]
Revenue									32	17	7
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue									340	429	600
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue									127
Perpetual software licenses and hardware | International
Disaggregation of Revenue [Line Items]
Revenue									213
Consulting services
Disaggregation of Revenue [Line Items]
Revenue									570	582	587
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue									198
Consulting services | International
Disaggregation of Revenue [Line Items]
Revenue									372
Marketing Applications
Disaggregation of Revenue [Line Items]
Revenue									$ 0
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Revenue										2,156	2,322
Calculated under Revenue Guidance in Effect before Topic 606 | Americas
Disaggregation of Revenue [Line Items]
Revenue										1,195	1,334
Calculated under Revenue Guidance in Effect before Topic 606 | International
Disaggregation of Revenue [Line Items]
Revenue										961	919
Calculated under Revenue Guidance in Effect before Topic 606 | Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue										739	703
Calculated under Revenue Guidance in Effect before Topic 606 | Recurring | International
Disaggregation of Revenue [Line Items]
Revenue										406	368
Calculated under Revenue Guidance in Effect before Topic 606 | Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue										234	369
Calculated under Revenue Guidance in Effect before Topic 606 | Perpetual software licenses and hardware | International
Disaggregation of Revenue [Line Items]
Revenue										195	231
Calculated under Revenue Guidance in Effect before Topic 606 | Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue										222	262
Calculated under Revenue Guidance in Effect before Topic 606 | Consulting services | International
Disaggregation of Revenue [Line Items]
Revenue										360	320
Calculated under Revenue Guidance in Effect before Topic 606 | Marketing Applications
Disaggregation of Revenue [Line Items]
Revenue										$ 0	$ 69

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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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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-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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