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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 460	$ 454	$ 1,442	$ 1,345
Americas
Disaggregation of Revenue [Line Items]
Revenue	249	261	786	764
EMEA
Disaggregation of Revenue [Line Items]
Revenue	133	115	408	351
APJ
Disaggregation of Revenue [Line Items]
Revenue	78	78	248	230
Recurring
Disaggregation of Revenue [Line Items]
Revenue	352	329	1,100	963
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	210	203	661	603
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	90	79	277	227
Recurring | APJ
Disaggregation of Revenue [Line Items]
Revenue	52	47	162	133
Perpetual software licenses, hardware and other
Disaggregation of Revenue [Line Items]
Revenue	18	25	58	73
Perpetual software licenses, hardware and other | Americas
Disaggregation of Revenue [Line Items]
Revenue	5	16	16	36
Perpetual software licenses, hardware and other | EMEA
Disaggregation of Revenue [Line Items]
Revenue	10	5	30	26
Perpetual software licenses, hardware and other | APJ
Disaggregation of Revenue [Line Items]
Revenue	3	4	12	11
Consulting services
Disaggregation of Revenue [Line Items]
Revenue	90	100	284	309
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	34	42	109	125
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	33	31	101	98
Consulting services | APJ
Disaggregation of Revenue [Line Items]
Revenue	$ 23	$ 27	$ 74	$ 86

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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