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Pensions - Sensitivity analysis (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) yr
Discount rate [member] | Low range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to decrease in assumption | $ 738
Service cost 2020, decrease | $ 25
Percentage of reasonably possible decrease in actuarial assumption | (0.50%)
Discount rate [member] | High range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to increase in assumption | $ (651)
Service cost 2020, increase | $ (22)
Percentage of reasonably possible increase in actuarial assumption | 0.50%
Expected rate of compensation [member] | Low range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to decrease in assumption | $ (181)
Service cost 2020, decrease | $ (11)
Percentage of reasonably possible decrease in actuarial assumption | (0.50%)
Expected rate of compensation [member] | High range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to increase in assumption | $ 191
Service cost 2020, increase | $ 11
Percentage of reasonably possible increase in actuarial assumption | 0.50%
Expected rate of pension increase [member] | Low range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to decrease in assumption | $ (541)
Service cost 2020, decrease | $ (15)
Percentage of reasonably possible decrease in actuarial assumption | (0.50%)
Expected rate of pension increase [member] | High range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to increase in assumption | $ 598
Service cost 2020, increase | $ 17
Percentage of reasonably possible increase in actuarial assumption | 0.50%
Mortality assumption [member] | Low range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to decrease in assumption | $ (364)
Service cost 2020, decrease | $ (10)
Increase (decrease) in mortality age assumption | yr | (1)
Mortality assumption [member] | High range value [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Defined benefit obligation, change due to increase in assumption | $ 333
Service cost 2020, increase | $ 9
Increase (decrease) in mortality age assumption | yr | 1

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- Definition The estimated increase (decrease) in service cost for the next fiscal year that could be caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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