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.

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+ Details

Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 457	$ 478	$ 891	$ 946
Americas
Disaggregation of Revenue [Line Items]
Revenue	259	269	503	538
EMEA
Disaggregation of Revenue [Line Items]
Revenue	118	122	236	235
APJ
Disaggregation of Revenue [Line Items]
Revenue	80	87	152	173
Recurring
Disaggregation of Revenue [Line Items]
Revenue	358	338	703	669
Recurring \| Americas
Disaggregation of Revenue [Line Items]
Revenue	221	217	435	430
Recurring \| EMEA
Disaggregation of Revenue [Line Items]
Revenue	87	75	171	148
Recurring \| APJ
Disaggregation of Revenue [Line Items]
Revenue	50	46	97	91
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	17	29	31	60
Perpetual software licenses and hardware \| Americas
Disaggregation of Revenue [Line Items]
Revenue	10	12	14	31
Perpetual software licenses and hardware \| EMEA
Disaggregation of Revenue [Line Items]
Revenue	4	10	13	17
Perpetual software licenses and hardware \| APJ
Disaggregation of Revenue [Line Items]
Revenue	3	7	4	12
Consulting services \| Americas
Disaggregation of Revenue [Line Items]
Revenue	28	40	54	77
Consulting services \| EMEA
Disaggregation of Revenue [Line Items]
Revenue	27	37	52	70
Consulting services \| APJ
Disaggregation of Revenue [Line Items]
Revenue	$ 27	$ 34	$ 51	$ 70