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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 454	$ 459	$ 1,345	$ 1,405
Americas
Disaggregation of Revenue [Line Items]
Revenue	261	256	764	794
EMEA
Disaggregation of Revenue [Line Items]
Revenue	115	118	351	353
APJ
Disaggregation of Revenue [Line Items]
Revenue	78	85	230	258
Recurring
Disaggregation of Revenue [Line Items]
Revenue	365	343	1,068	1,012
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	221	222	656	652
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	92	75	263	223
Recurring | APJ
Disaggregation of Revenue [Line Items]
Revenue	52	46	149	137
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	17	16	48	76
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue	14	0	28	31
Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue	1	12	14	29
Perpetual software licenses and hardware | APJ
Disaggregation of Revenue [Line Items]
Revenue	2	4	6	16
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	26	34	80	111
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	22	31	74	101
Consulting services | APJ
Disaggregation of Revenue [Line Items]
Revenue	$ 24	$ 35	$ 75	$ 105

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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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