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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 491	$ 457	$ 982	$ 891
Americas
Disaggregation of Revenue [Line Items]
Revenue	274	259	537	503
EMEA
Disaggregation of Revenue [Line Items]
Revenue	128	118	275	236
APJ
Disaggregation of Revenue [Line Items]
Revenue	89	80	170	152
Recurring
Disaggregation of Revenue [Line Items]
Revenue	376	323	748	634
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	233	204	451	400
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	86	75	187	148
Recurring | APJ
Disaggregation of Revenue [Line Items]
Revenue	57	44	110	86
Perpetual software licenses, hardware and other
Disaggregation of Revenue [Line Items]
Revenue	17	25	40	48
Perpetual software licenses, hardware and other | Americas
Disaggregation of Revenue [Line Items]
Revenue	4	13	11	20
Perpetual software licenses, hardware and other | EMEA
Disaggregation of Revenue [Line Items]
Revenue	7	8	20	21
Perpetual software licenses, hardware and other | APJ
Disaggregation of Revenue [Line Items]
Revenue	6	4	9	7
Consulting services
Disaggregation of Revenue [Line Items]
Revenue	98	109	194	209
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	37	42	75	83
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	35	35	68	67
Consulting services | APJ
Disaggregation of Revenue [Line Items]
Revenue	$ 26	$ 32	$ 51	$ 59

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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
-Topic 280
-SubTopic 10
-Section 50
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