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Pensions - Actuarial losses and gains (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Actuarial losses and gains recognised directly in Other comprehensive income |  |  |
Net actuarial (losses) gains recognised in OCI during the year | $ 63 | $ 3 | $ 401
Actuarial (losses) gains related to currency effects on net obligation and foreign exchange translation | 84 | (109) | 27
Tax effects of actuarial (losses) gains recognised in OCI | (35) | 19 | (98)
Items that will not be reclassified to the Consolidated statement of income | 111 | (87) | 330
Cumulative actuarial (losses) gains recognised directly in OCI net of tax | $ (787) | $ (899) | $ (812)

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