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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 544 | $ 513 | $ 1,050 | $ 1,004
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 287 | 271 | 551 | 538
Non-US |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 257 | 242 | 499 | 466
Subscriptions Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 312 | 281 | 614 | 554
Subscriptions Revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 197 | 182 | 391 | 361
Subscriptions Revenue | Non-US |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 113 | 99 | 222 | 193
Software and Hardware Perpetual Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 97 | 91 | 166 | 181
Software and Hardware Perpetual Revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 41 | 35 | 63 | 68
Software and Hardware Perpetual Revenue | Non-US |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 57 | 56 | 104 | 113
Consulting Revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | 49 | 54 | 97 | 109
Consulting Revenue | Non-US |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer | $ 87 | $ 87 | $ 173 | $ 160

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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