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Employee benefits - Evolution of assets fair value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Overfunded pension plans
Evolution of assets fair value
Benefit obligation (Plan assets) as at beginning of the year	$ 864	$ 1,298
Interest income	58	74
Translation adjustment	(63)	(230)
Benefit obligation (Plan assets) as at end of the year	919	864
Overfunded pension plans | Plan assets
Evolution of assets fair value
Benefit obligation (Plan assets) as at beginning of the year	3,969	5,304
Interest income	253	298
Employer contributions	29	(39)
Benefits paid	(235)	(368)
Return on plan assets (excluding interest income)	(269)	(114)
Translation adjustment	(276)	(1,112)
Transfers	281
Benefit obligation (Plan assets) as at end of the year	3,752	3,969
Underfunded pension plans
Evolution of assets fair value
Benefit obligation (Plan assets) as at beginning of the year	641
Benefit obligation (Plan assets) as at end of the year	204	641
Underfunded pension plans | Plan assets
Evolution of assets fair value
Benefit obligation (Plan assets) as at beginning of the year	3,992	3,726
Interest income	102	109
Employer contributions	40	54
Benefits paid	(257)	(248)
Return on plan assets (excluding interest income)	181	305
Translation adjustment	2	46
Transfers	(281)
Benefit obligation (Plan assets) as at end of the year	3,779	3,992
Other benefits
Evolution of assets fair value
Benefit obligation (Plan assets) as at beginning of the year	1,733
Benefit obligation (Plan assets) as at end of the year	1,428	1,733
Other benefits | Plan assets
Evolution of assets fair value
Employer contributions	56	53
Benefits paid	$ (56)	$ (53)

X

- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph f
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph e
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_b&doctype=Standard
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 140
-Subparagraph a
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph g
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from transfers.

+ References

No definition available.

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