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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Stockholders Equity [Abstract] |  |  |  |
Common treasury shares (in shares) | 45,465,877 | 45,992,714 | 45,813,109 | 46,292,384
Tax on foreign currency translation | $ (8) | $ 2 |  |
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost | 9 | 8 |  |
Tax on increase / decrease in net actuarial losses | 0 | 1 |  |
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures | (1) | 0 |  |
Tax effect of deferred derivative gains | 5 | 0 |  |
Tax effect of reclassification adjustment for amounts recognized in income | $ 0 | $ 0 |  |
Cash dividends declared per common share (in dollars per share) | $ 0.16 | $ 0.16 |  |

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