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Post-employment benefits for associates - Additional information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |  |
Weighted average duration of defined benefit obligation | 15 years 7 months 6 days | 16 years 10 months 24 days |
Defined contribution plans charges | $ 128 | $ 105 | $ 97
Benefit obligation [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Top four countries, percentage | 87.00% |  |
Pension plans [member] | Germany | Foreign countries [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Maximum number of years to eliminate shortfall | 10 years |  |
Other post-employment benefit plans [member] | Benefit obligation [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Associates covered, percentage | 99.00% |  |

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- Definition Associates Covered By Plan Percentage Of Defined Benefit Obligation + References No definition available. + Details
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- Definition Maximum Period Of Time To Eliminate Shortfall In Defined Benefit Plan + References No definition available. + Details
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- Definition Top Four Countries Composing Net Defined Benefit Liability (Asset), Percentage + References No definition available. + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_53&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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- Details
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