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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |
Treasury shares (shares) | 45,942,257,000,000 | 45,992,714 | 41,447,682 | 38,634,545 | 45,942,257,000,000 | 41,447,682 | 46,292,384 | 38,308,825
Foreign currency translation, tax | $ 2 | $ 2 | $ (6) | $ (2) | $ 4 | $ (8) |  |
Amortization of prior service cost and unrecognized gains and (losses) included in total benefit cost, tax | 8 | 8 | 8 | 8 | 16 | 16 |  |
(Increase)/Decrease in net actuarial losses, tax | 3 | 1 | 5 | 1 | 4 | 6 |  |
Prior service (cost) credit from plan amendments, tax | 0 |  | 0 |  | 0 | 0 |  |
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, tax | 0 |  | 2 |  | 0 | 2 |  |
Deferred derivative gains (losses), tax | 0 | 0 | 4 | (2) | $ 0 | $ 2 |  |
Reclassification adjustment for amounts recognized in income, tax | $ (1) | $ 0 | $ 1 | $ 1 |  |  |  |
Cash dividends declared (dollars per share) | $ 0.16 |  | $ 0.14 |  | $ 0.32 | $ 0.28 |  |

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