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Segment Information - Revenue from External Customers by Products and Services (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue from External Customer [Line Items] |  |  |
Total revenue | $ 6,915 | $ 6,405 | $ 6,516
Product [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total revenue | 2,681 | 2,341 | 2,579
Technology Service [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total revenue | 1,089 | 1,094 | 1,055
Recurring revenue, including maintenance and cloud revenue [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Total revenue | $ 3,145 | $ 2,970 | $ 2,882

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- Definition Amount, including 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 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: 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 + Details
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