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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 544	$ 513	$ 1,050	$ 1,004
United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	287	271	551	538
Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	257	242	499	466
Subscriptions Revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	312	281	614	554
Subscriptions Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	197	182	391	361
Subscriptions Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	113	99	222	193
Software and Hardware Perpetual Revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	97	91	166	181
Software and Hardware Perpetual Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	41	35	63	68
Software and Hardware Perpetual Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	57	56	104	113
Consulting Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	49	54	97	109
Consulting Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 87	$ 87	$ 173	$ 160

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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

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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