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Post-employment benefits for associates - Sensitivity analysis (Details) $ in Millions	Dec. 31, 2023 USD ($)
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to increase in actuarial assumption	$ (26)
Increase (decrease) in defined benefit obligation due to decrease in actuarial assumption	27
Life expectancy
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to increase in actuarial assumption	17
Rate of pension increase
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to increase in actuarial assumption	7
Increase (decrease) in defined benefit obligation due to decrease in actuarial assumption	(4)
Interest on savings account
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to increase in actuarial assumption	3
Increase (decrease) in defined benefit obligation due to decrease in actuarial assumption	(3)
Rate of salary increase
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to increase in actuarial assumption	3
Increase (decrease) in defined benefit obligation due to decrease in actuarial assumption	$ (3)

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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