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Employee Benefits - Summary of Increase (Decrease) Would Have Resulted in the DBO Pension and Other Benefits (Detail) $ in Thousands	Dec. 31, 2020 MXN ($)
-100 [member] | Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	$ 29,012,552
-100 [member] | Health care cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	(665,934)
+100 [member] | Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	(25,541,956)
+100 [member] | Health care cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
DBO pension and other benefits	$ 781,238

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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

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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