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Employee benefits - Costs recognized in the income statement (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Overfunded pension plans |  |  |
Costs recognized in the income statement |  |  |
Service cost | $ 7 | $ 7 | $ 5
Interest on expense on liabilities | 222 | 317 | 282
Interest income on plan assets | (297) | (432) | (406)
Interest expense on effect of (asset ceiling)/ onerous liability | 74 | 114 | 124
Total of cost, net | 6 | 6 | 5
Underfunded pension plans |  |  |
Costs recognized in the income statement |  |  |
Service cost | 52 | 55 | 101
Interest on expense on liabilities | 134 | 153 | 158
Interest income on plan assets | (107) | (123) | (127)
Total of cost, net | 79 | 85 | 132
Other benefits |  |  |
Costs recognized in the income statement |  |  |
Service cost | 18 | 10 | 36
Interest on expense on liabilities | 64 | 57 | 59
Total of cost, net | $ 82 | $ 67 | $ 95

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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition Amount of interest expense on effect of (asset ceiling) or onerous liability related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of interest income on plan assets related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of interest on expense on liabilities related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of service cost expense recognized related to defined benefit plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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