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Pensions and Post-Employment Benefits - Summary of Significant Assumptions Used in the Determination of the Benefit Obligation (Detail) - Defined Benefit Obligation [Member] | Dec. 31, 2018 | Dec. 31, 2017
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Mexico [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rates | 10.80% | 9.30%
Rate of return on plan assets | 10.80% | 9.30%
Rate of salary increases | 4.00% | 4.00%
United States [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rates | 4.50% | 3.90%
Rate of return on plan assets | 4.50% | 3.90%
Rate of salary increases | 0.00% | 0.00%
United Kingdom [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rates | 2.90% | 2.40%
Rate of return on plan assets | 2.90% | 2.40%
Rate of salary increases | 3.30% | 3.20%
Top of range [member] | Other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rates | 1.30% | 1.30%
Rate of return on plan assets | 1.30% | 1.30%
Rate of salary increases | 2.30% | 1.50%
Bottom of range [member] | Other countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rates | 7.50% | 6.30%
Rate of return on plan assets | 7.50% | 6.30%
Rate of salary increases | 6.00% | 6.00%

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- Definition Actuarial assumption of rate of return on plan assets. + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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