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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |
Treasury shares (shares) | 45,992,714 | 38,634,545
Foreign currency translation, tax | $ 2 | $ 2
Amortization of prior service cost and unrecognized gains and (losses) included in total benefit cost, tax | 8 | 8
(Increase)/Decrease in net actuarial losses, tax | 1 | 1
Reclassification adjustment for amounts recognized in income, tax | 0 | 1
Deferred derivative gains (losses), tax | $ 0 | $ (2)
Cash dividends declared (dollars per share) | $ 0.16 | $ 0.14

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