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Employee benefits - Expected benefit payments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Employee benefits
Disbursement of cash flow in 2021	$ 57
2021 | Overfunded pension plans
Employee benefits
Expected benefit payments	215
2021 | Underfunded pension plans
Employee benefits
Expected benefit payments	239
2021 | Other benefits
Employee benefits
Expected benefit payments	17
2022 | Overfunded pension plans
Employee benefits
Expected benefit payments	220
2022 | Underfunded pension plans
Employee benefits
Expected benefit payments	237
2022 | Other benefits
Employee benefits
Expected benefit payments	18
2023 | Overfunded pension plans
Employee benefits
Expected benefit payments	224
2023 | Underfunded pension plans
Employee benefits
Expected benefit payments	238
2023 | Other benefits
Employee benefits
Expected benefit payments	19
2024 | Overfunded pension plans
Employee benefits
Expected benefit payments	227
2024 | Underfunded pension plans
Employee benefits
Expected benefit payments	239
2024 | Other benefits
Employee benefits
Expected benefit payments	20
2025 | Overfunded pension plans
Employee benefits
Expected benefit payments	230
2025 | Underfunded pension plans
Employee benefits
Expected benefit payments	238
2025 | Other benefits
Employee benefits
Expected benefit payments	21
2026 and thereafter | Overfunded pension plans
Employee benefits
Expected benefit payments	1,177
2026 and thereafter | Underfunded pension plans
Employee benefits
Expected benefit payments	1,175
2026 and thereafter | Other benefits
Employee benefits
Expected benefit payments	$ 119

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- Definition

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+ 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
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-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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