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Post-Employment and Other Non-current Employee Benefits - Summary of Long-term Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financial: |  |  |  |
Discount rate used to calculate the defined benefit obligation |  | 7.50% | 9.40% | 7.60%
Salary increase |  | 4.50% | 4.60% | 4.60%
Future pension increases |  | 3.50% | 3.60% | 3.50%
Biometric: |  |  |  |
Mortality | [1] | EMSSA 2009 | EMSSA 2009 | EMSSA 2009
Disability | [2] | IMSS-97 | IMSS-97 | IMSS-97
Normal retirement age |  | 60 years | 60 years | 60 years
Rest of employee turnover | [3] | BMAR2007 | BMAR2007 | BMAR2007
[1] | EMSSA. Mexican Experience of Social Security (for its initials in Spanish)
[2] | IMSS. Mexican Experience of Instituto Mexicano del Seguro Social (for its initials in Spanish)
[3] | BMAR. Actuary experience

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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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The expected rate of increases in pension that is 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- References No definition available. + Details
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- Definition Biometric [abstract] + References No definition available. + Details
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- Definition Description of Disability + References No definition available. + Details
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- Definition Description of Mortality + References No definition available. + Details
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- Definition Description of Rest of Employee Turnover + References No definition available. + Details
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