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Revenues Revenues Recognized from Performance Obligations Satisfied in Prior Periods (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue recognized related to royalties for licenses of our intellectual property [Member] |  |  |  |
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Line Items] |  |  |  |
Contract with Customer, Performance Obligation Satisfied in Previous Period | $ 201 | $ 167 | $ 527 | $ 395
Change in estimate variable consideration [Member] |  |  |  |
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Line Items] |  |  |  |
Contract with Customer, Performance Obligation Satisfied in Previous Period | $ 9 |  | $ 309 |

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- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL108322424-203045 + Details
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- Details
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