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Post-employment benefits for associates - Schedule of expected future cash flows (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Pension plans [member]
Expected employer contributions to funded plans
2021 (estimated)	$ 11
Other post-employment benefit plans [member]
Expected employer contributions to funded plans
2021 (estimated)	0
2021 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	44
2021 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	19
2022 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	26
2022 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	21
2023 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	28
2023 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	22
2024 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	32
2024 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	23
2025 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	32
2025 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	23
2026-2030 | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	185
2026-2030 | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	$ 110

X

- Definition

Defined Benefit Plan, Expected Future Benefit Payment1 [Abstract]

+ References

No definition available.

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- Definition

Defined Benefit Plan, Expected Future Employer Contributions1 [Abstract]

+ References

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_148_d_iii&doctype=Standard
-URIDate 2020-01-01

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 141
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard
-URIDate 2020-01-01

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