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Performance B.4.2. Pension and other long-term employee benefit plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period | 5 years |
Termination Plans |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability | $ 59 | $ 59
Estimate of contributions expected to be paid to plan in future years | $ 95 | $ 106
Weighted average duration of defined benefit obligation | 6 years | 6 years
Bottom of range | Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period, additional bonus | 5 years |
Top of range | Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period, additional bonus | 40 years |

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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_147_c&doctype=Standard -URIDate 2019-03-27 + Details
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