Pensions - Actuarial losses and gains (Details) - USD ($) $ in Millions	12 Months Ended
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)

No definition available.

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- Definition

The accumulated amount of net gain or (losses) relating to amounts recognised in other comprehensive income in relation to remeasurement of defined plans.

+ References

No definition available.

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- Definition

The amount of net gain or (losses) relating to amounts recognised in other comprehensive income in relation to changes in foreign currency .

+ References

No definition available.

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- Definition

The amount of net gain or (losses) relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans, excluding currency effects.

+ References

No definition available.

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

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- Definition

The amount of other comprehensive income that will not be reclassified to profit or loss, net of tax. [Refer: Other comprehensive income]

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