Post-employment Benefits - Plan assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Post-employment benefit plans
Minimum investment required (as a percent)	30.00%
Weighted average asset allocation (as a percent)	100.00%	100.00%
Fair value of plan assets held by the trust	$ 119,851	$ 101,690
Weighted average expected long-term rate of return of plan assets	7.79%	6.59%
Minimum
Post-employment benefit plans
Term for liquidity of mutual funds	1 day
Maximum
Post-employment benefit plans
Term for liquidity of mutual funds	1 month
Equity securities
Post-employment benefit plans
Target allocation (as a percent)	30.00%
Weighted average asset allocation (as a percent)	32.70%	28.80%
Fixed rate instruments
Post-employment benefit plans
Target allocation (as a percent)	70.00%
Weighted average asset allocation (as a percent)	67.30%	71.20%