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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, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 506	$ 491
United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	264	267
Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	242	224
Subscriptions Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	194	179
Subscriptions Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	109	94
Software and Hardware Perpetual Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	22	33
Software and Hardware Perpetual Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	47	57
Consulting Revenue | United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	48	55
Consulting Revenue | Non-US
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 86	$ 73

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+ 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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