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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Stockholders Equity [Abstract] |  |  |  |  |  |  |  |
Common treasury shares (in shares) | 45,329,344 | 45,899,918 | 45,452,865 | 45,942,257 | 45,329,344 | 45,899,918 | 45,813,109 | 46,292,384
Tax on foreign currency translation | $ 2 | $ (1) | $ (4) | $ 4 | $ (2) | $ 3 |  |
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost | 9 | 8 | 17 | 16 | 26 | 24 |  |
Tax on increase / decrease in net actuarial losses | (1) | (3) | (2) | 4 | (3) | 1 |  |
Prior service (cost) credit from plan amendments, tax | 0 | 0 |  | 0 | 0 | 0 |  |
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures | 4 | 0 | (1) |  | 3 | 0 |  |
Tax effect of deferred derivative gains | 0 | 4 | 1 | 0 | 1 | 4 |  |
Tax effect of reclassification adjustment for amounts recognized in income | $ 0 | $ 0 | $ 0 | $ (1) | $ 0 | $ (1) |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.16 |  |  | $ 0.16 | $ 0.48 |  |

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- Definition Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28129-110885 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32262-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30755-110894 + Details
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