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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,836	$ 1,899	$ 2,164
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,025
EMEA
Disaggregation of Revenue [Line Items]
Revenue	485	492	587
APJ
Disaggregation of Revenue [Line Items]
Revenue	326	350	451
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	883
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	362
Recurring | APJ
Disaggregation of Revenue [Line Items]
Revenue	206
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	73	106	340
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue	36
Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue	23
Perpetual software licenses and hardware | APJ
Disaggregation of Revenue [Line Items]
Revenue	14
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	106
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	100
Consulting services | APJ
Disaggregation of Revenue [Line Items]
Revenue	$ 106
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Revenue		1,899	2,164
Calculated under Revenue Guidance in Effect before Topic 606 | Americas
Disaggregation of Revenue [Line Items]
Revenue		1,057	1,126
Calculated under Revenue Guidance in Effect before Topic 606 | EMEA
Disaggregation of Revenue [Line Items]
Revenue		492	587
Calculated under Revenue Guidance in Effect before Topic 606 | APJ
Disaggregation of Revenue [Line Items]
Revenue		350	451
Calculated under Revenue Guidance in Effect before Topic 606 | Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue		873	801
Calculated under Revenue Guidance in Effect before Topic 606 | Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue		305	282
Calculated under Revenue Guidance in Effect before Topic 606 | Recurring | APJ
Disaggregation of Revenue [Line Items]
Revenue		185	171
Calculated under Revenue Guidance in Effect before Topic 606 | Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue		38	127
Calculated under Revenue Guidance in Effect before Topic 606 | Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue		43	112
Calculated under Revenue Guidance in Effect before Topic 606 | Perpetual software licenses and hardware | APJ
Disaggregation of Revenue [Line Items]
Revenue		25	101
Calculated under Revenue Guidance in Effect before Topic 606 | Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue		146	198
Calculated under Revenue Guidance in Effect before Topic 606 | Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue		144	193
Calculated under Revenue Guidance in Effect before Topic 606 | Consulting services | APJ
Disaggregation of Revenue [Line Items]
Revenue		$ 140	$ 179

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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
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