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Restructuring - Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Positions | Dec. 31, 2018 USD ($) Positions | Dec. 31, 2017 USD ($)
Restructuring Plan, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reduction, positions | Positions |  | 300 |  |
Restructuring charges paid |  | $ 7 |  |
Restructuring Plan, 2018 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Workforce reduction, positions | Positions |  |  | 160 |
Restructuring reserves | $ 3 |  | $ 3 |
Restructuring charges paid | $ 25 | 22 | $ 1 |
Restructuring Plan, 2017 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserves |  |  |  | $ 6
Restructuring charges paid |  | $ 44 |  |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 + Details
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