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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Other comprehensive loss, Before Tax      
Remeasurement of post-employment benefit obligations $ (247,092) $ (97,086) $ (283,106)
Remeasurement of post-employment benefit obligations of assets held for sale (3,445)    
Exchange differences on translating foreign operations (98,422) (859,032) 334,097
Derivative financial instruments cash flow hedges, Before Tax (1,521,912) 174,532 231,758
Warrants exercisable for common stock of UHI 257,306 (1,347,698) (280,447)
Opend Ended Fund, Before Tax (351,202) 215,957 1,008,675
Other equity instruments, Before Tax (794,624) 603,766  
Other financial assets, Before Tax 111 (111)  
Share of loss of associates and joint ventures, Before Tax (236,159) (47,313) (60,340)
Other comprehensive (loss) income before income taxes (2,995,439) (1,356,985) 950,637
Other comprehensive loss, Tax (Charge) Credit      
Remeasurement of post-employment benefit obligations, Tax (Charge) Credit 74,128 230,623  
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 (101,323) (587) (78,040)
Derivative financial instruments cash flow hedges, Tax (Charge) Credit 456,574 (52,359) (69,527)
Warrants exercisable for common stock of UHI, Tax (Charge) Credit (77,192) 404,309 84,134
Open Ended Fund, Tax (Charge) Credit 112,590 (64,787) (302,603)
Other equity instruments, Tax (Charge) Credit 238,387 (181,130)  
Other financial assets, Tax (Charge) Credit (33) 33  
Other comprehensive income, Tax (Charge) Credit 704,164 336,102 (366,036)
Current tax (449,933) (587) (78,040)
Deferred tax 1,154,097 336,689 (287,996)
Other comprehensive loss, After Tax      
Remeasurement of post-employment benefit obligations, After Tax (172,964) 133,537 (283,106)
Remeasurement of post-employment benefit obligations of assets held for sale, after tax (2,412)    
Exchange differences on translating foreign operations, After Tax (199,745) (859,619) 256,057
Derivative financial instruments cash flow hedges, After Tax (1,065,338) 122,173 162,231
Warrants exercisable for common stock of UHI, After Tax 180,114 (943,389) (196,313)
Open Ended Fund, After Tax (238,612) 151,170 706,072
Other equity instruments, After Tax (556,237) 422,636  
Other financial assets, After Tax 78 (78)  
Share of loss of associates and joint ventures, After Tax (236,159) (47,313) (60,340)
Total other comprehensive income (2,291,275) (1,020,883) $ 584,601
Deferred income tax liability related to associates and joint ventures $ 1,029,209 993,402  
Deferred Tax Expense (Income) Relating to Remeasurement of Post Employment Benefit Obligations   $ 201,497