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Pensions - Actuarial losses and gains (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Actuarial losses and gains recognised directly in Other comprehensive income |  |  |
Net actuarial (losses) gains recognised in OCI during the year | $ 401 | $ (282) | $ 331
Actuarial (losses) gains related to currency effects on net obligation and foreign exchange translation | 27 | 172 | (158)
Tax effects of actuarial (losses) gains recognised in OCI | (98) | 22 | (38)
Items that will not be reclassified to the Consolidated statement of income | 329 | (88) | 134
Cumulative actuarial (losses) gains recognised directly in OCI net of tax | $ (812) | $ (1,141) | $ (1,053)

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