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Capital Stock and Long-term Retention Plan - Stock awards (Details) - Long-Term Retention Plan
EquityInstruments in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
EquityInstruments
MXN ($)
$ / shares
Dec. 31, 2020
EquityInstruments
$ / shares
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
$ / shares
Dec. 31, 2017
EquityInstruments
Dec. 31, 2016
EquityInstruments
CPOs or CPOs Equivalent            
Paid by employees (in CPOs) | $ (4,745.3)          
Forfeited (in CPOs) | $ (9,490.5)          
Weighted-Average Exercise Price            
Weighted-average remaining contractual life of the awards   1 year 4 months 17 days 1 year 8 months 12 days      
CPOs            
CPOs or CPOs Equivalent            
Outstanding at beginning of year (in CPOs) | EquityInstruments   243,472 179,051      
Conditionally sold (in CPOs) | EquityInstruments   39,200 72,558 32,500 37,000 39,000
Paid by employees (in CPOs) | EquityInstruments     (3,107)      
Forfeited (in CPOs) | EquityInstruments   (122,307) (5,030)      
Outstanding at end of year (in CPOs) | EquityInstruments 243,472 160,365 243,472 179,051    
To be paid by employees at end of year (in CPOs) | EquityInstruments 110,828 23,361 110,828      
Weighted-Average Exercise Price            
Outstanding at beginning of year (in pesos per CPO) | $ / shares   $ 65.19 $ 75.77      
Conditionally sold | $ / shares   6.84 38.50      
Paid by employees (in pesos per CPO) | $ / shares     33.75      
Forfeited (in pesos per CPO) | $ / shares   81.36 73.20      
Outstanding at end of year (in pesos per CPO) | $ / shares $ 65.19 39.36 65.19 $ 75.77    
To be paid by employees at end of year (in pesos per CPO) | $ / shares $ 81.26 $ 80.72 $ 81.26