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Income Taxes - Tax (charge) credit relating to components of other comprehensive income (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other comprehensive loss, Before Tax      
Remeasurement of post-employment benefit obligations $ 279,825 $ (344,313) $ (247,092)
Remeasurement of post-employment benefit obligations of assets held for sale     (3,445)
Exchange differences on translating foreign operations 92,555 133,522 (98,422)
Derivative financial instruments cash flow hedges, Before Tax 1,927,601 (1,370,145) (1,521,912)
Warrants exercisable for common stock of UHI   (21,899,164) 257,306
Open Ended Fund, Before Tax (19,718) (904,423) (351,202)
Other equity instruments, Before Tax (123,359) (353,496) (794,624)
Other financial assets, Before Tax     111
Share of loss of associates and joint ventures, Before Tax 245,714 (61,033) (236,159)
Other comprehensive income (loss) before income taxes 2,402,618 (24,799,052) (2,995,439)
Other comprehensive loss, Tax (Charge) Credit      
Remeasurement of post-employment benefit obligations, Tax (Charge) Credit (83,947) 103,294 74,128
Remeasurement of post-employment benefit obligations of assets held for sale, Tax (Charge) Credit     1,033
Exchange differences on translating foreign operations, Tax (Charge) Credit 151,555 408,221 (101,323)
Derivative financial instruments cash flow hedges, Tax (Charge) Credit (578,280) 411,044 456,574
Warrants exercisable for common stock of UHI, Tax (Charge) Credit   6,639,400 (77,192)
Open Ended Fund, Tax (Charge) Credit 5,915 268,906 112,590
Other equity instruments, Tax (Charge) Credit 37,008 106,049 238,387
Other financial assets, Tax (Charge) Credit     (33)
Other comprehensive income, Tax (Charge) Credit (467,749) 7,936,914 704,164
Current tax 151,555 408,221 (449,933)
Deferred tax (619,304) 7,528,693 1,154,097
Other comprehensive loss, After Tax      
Remeasurement of post-employment benefit obligations, After Tax 195,878 (241,019) (172,964)
Remeasurement of post-employment benefit obligations of assets held for sale, after tax     (2,412)
Exchange differences on translating foreign operations, After Tax 244,110 541,743 (199,745)
Derivative financial instruments cash flow hedges, After Tax 1,349,321 (959,101) (1,065,338)
Warrants exercisable for common stock of UHI, After Tax   (15,259,764) 180,114
Open Ended Fund, After Tax (13,803) (635,517) (238,612)
Other equity instruments, After Tax (86,351) (247,447) (556,237)
Other financial assets, After Tax     78
Share of loss of associates and joint ventures, After Tax 245,714 (61,033) (236,159)
Total other comprehensive income 1,934,869 (16,862,138) $ (2,291,275)
Deferred income tax liability related to associates and joint ventures $ 44,945 $ 44,820