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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 459 | $ 526 | $ 1,405 | $ 1,576
Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 256 | 277 | 794 | 828
EMEA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 118 | 139 | 353 | 415
APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 85 | 110 | 258 | 333
Recurring |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 343 | 312 | 1,012 | 926
Recurring | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 222 | 198 | 652 | 590
Recurring | EMEA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 75 | 70 | 223 | 207
Recurring | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 46 | 44 | 137 | 129
Perpetual software licenses and hardware |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 16 | 77 | 76 | 243
Perpetual software licenses and hardware | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 31 | 31 | 93
Perpetual software licenses and hardware | EMEA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12 | 26 | 29 | 69
Perpetual software licenses and hardware | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4 | 20 | 16 | 81
Consulting services | Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 34 | 48 | 111 | 145
Consulting services | EMEA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 31 | 43 | 101 | 139
Consulting services | APAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 35 | $ 46 | $ 105 | $ 123

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- Definition 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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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