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Employee benefits - Underfunded pension plans, Measurement of plan assets at fair value (Details) - Level 3 - Underfunded pension plans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Measurement of plan assets |  |
Assets as at beginning of the year | $ 435 | $ 432
Return on plan assets |  | 20
Assets purchases | 20 | 18
Assets sold during the year | (33) | (37)
Translation adjustment | 15 | 2
Assets as at end of the year | 437 | 435
Private equity funds |  |
Measurement of plan assets |  |
Assets as at beginning of the year | 212 | 213
Return on plan assets | 1 | 11
Assets purchases | 20 | 18
Assets sold during the year | (33) | (32)
Translation adjustment | 50 | 2
Assets as at end of the year | 250 | 212
Real estate funds |  |
Measurement of plan assets |  |
Assets as at beginning of the year | 55 | 51
Return on plan assets | (1) | 4
Translation adjustment | (49) |
Assets as at end of the year | 5 | 55
Loans to participants |  |
Measurement of plan assets |  |
Assets as at beginning of the year | 3 | 3
Assets sold during the year |  | (1)
Translation adjustment | (1) | 1
Assets as at end of the year | 2 | 3
Others |  |
Measurement of plan assets |  |
Assets as at beginning of the year | 165 | 165
Return on plan assets |  | 5
Assets sold during the year |  | (4)
Translation adjustment | 15 | (1)
Assets as at end of the year | $ 180 | $ 165

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- Definition The gains (losses) excluding exchange differences, recognised in profit or loss, on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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