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Taxes on Income - Tax reform estimates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effect of Tax Cuts and Jobs Act [Abstract] |  |  |
Effective income tax rate |  | 21.00% | 35.00%
Provisional increase of tax expense, change in tax rate effect on tax asset position |  |  | $ 52
Provisional increase of transition tax expense |  |  | $ 31
Final impact of measurement period adjustments |  | $ (45) |
Amount of tax expense related to GILTI | $ 12 |  |

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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Amount of reasonable estimate for income tax expense for which accounting for tax effect for remeasurement of deferred tax asset from change in tax rate is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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- Definition Amount of reasonable estimate for tax liability for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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