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Pensions and Post-Employment Benefits - Aggregate Projected Benefit Obligation for Pension Plans and Other Post-employment Benefits and the Plan Assets by Country (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
PBO | $ 3,033 | $ 2,738 | $ 2,454
Assets | 1,694 | 1,600 | $ 1,487
Deficit | 1,339 | 1,138 |
Mexico [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 216 | 203 |
Assets | 29 | 24 |
Deficit | 187 | 179 |
United States [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 305 | 297 |
Assets | 222 | 219 |
Deficit | 83 | 78 |
United Kingdom [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 1,925 | 1,681 |
Assets | 1,214 | 1,128 |
Deficit | 711 | 553 |
Germany [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 219 | 204 |
Assets | 8 | 9 |
Deficit | 211 | 195 |
Other countries [member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
PBO | 368 | 353 |
Assets | 221 | 220 |
Deficit | $ 147 | $ 133 |

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + 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 Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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 fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [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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- Details
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