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Employee benefits - Costs recognized in the statement of comprehensive income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Costs recognized in the statement of comprehensive income
Others comprehensive income	$ (5,248)	$ (5,492)	$ (848)
Overfunded pension plans
Costs recognized in the statement of comprehensive income
Balance at beginning of the year	(101)	(173)	(166)
Effect of changes actuarial assumptions	330	(118)	(718)
Return on plan assets (excluding interest income)	(269)	(114)	757
Change of asset ceiling	(60)	278	(60)
Others	(5)
Total	(4)	46	(21)
Deferred income tax	5	(15)	7
Others comprehensive income	1	31	(14)
Translation adjustments	7	41	7
Accumulated other comprehensive income	(93)	(101)	(173)
Underfunded pension plans
Costs recognized in the statement of comprehensive income
Balance at beginning of the year	(400)	(459)	(468)
Effect of changes actuarial assumptions	246	(271)	(373)
Return on plan assets (excluding interest income)	181	305	385
Others	3	9
Total	430	43	12
Deferred income tax	(130)	(12)	(5)
Others comprehensive income	300	31	7
Translation adjustments	8	28	2
Accumulated other comprehensive income	(92)	(400)	(459)
Other benefits
Costs recognized in the statement of comprehensive income
Balance at beginning of the year	(363)	(238)	(128)
Effect of changes actuarial assumptions	261	(243)	(182)
Others	(4)	11
Total	257	(232)	(182)
Deferred income tax	(83)	82	63
Others comprehensive income	174	(150)	(119)
Translation adjustments	17	25	9
Accumulated other comprehensive income	$ (172)	$ (363)	$ (238)

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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]]

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The amount of income and expense (including reclassification adjustments) that is not recognised in profit or loss as required or permitted by IFRSs. [Refer: IFRSs [member]]

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The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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The amount of other comprehensive income, net of tax, related to change of asset ceiling / costly liabilities (excluding interest income) of defined benefit plans.

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The amount of other comprehensive income, net of tax, related to actuarial gains and losses of defined benefit plans.

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The amount of other comprehensive income, net of tax, other loss (gains) of defined benefit plans.

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The amount of other comprehensive income, net of tax, related to return on plan assets (excluding interest income) of defined benefit plans.

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