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Post-employment benefits for associates - Schedule of expected future cash flows (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Pension plans [member]
Employer contributions
2020 (estimated)	$ 14
Other post-employment benefit plans [member]
Employer contributions
2020 (estimated)	0
2020 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	41
2020 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	21
2021 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	26
2021 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	22
2022 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	27
2022 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	24
2023 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	27
2023 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	25
2024 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	32
2024 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	26
2025-2029 [member] | Pension plans [member]
Expected future benefit payments
Expected future benefit payments	169
2025-2029 [member] | Other post-employment benefit plans [member]
Expected future benefit payments
Expected future benefit payments	$ 133

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 2019-01-01
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_148_d_iii&doctype=Standard
-URIDate 2019-03-27

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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 2019-01-01
-Paragraph 141
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard
-URIDate 2019-03-27

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