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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

X

- 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
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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.

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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
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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

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