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Capital Stock and Long-term Retention Plan - Stock awards (Details) - Long-Term Retention Plan
EquityInstruments in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
EquityInstruments
Dec. 31, 2016
MXN ($)
EquityInstruments
Dec. 31, 2015
MXN ($)
EquityInstruments
Dec. 31, 2014
EquityInstruments
Dec. 31, 2013
EquityInstruments
Weighted-Average Exercise Price          
Weighted-average remaining contractual life of the awards 1 year 3 months 11 days 1 year 3 months 11 days      
CPOs          
CPOs or CPOs Equivalent          
Outstanding at beginning of year (in CPOs) | EquityInstruments 146,293 144,250      
Conditionally sold (in CPOs) | EquityInstruments 37,000 39,000 39,000 39,000 39,000
Paid by employees (in CPOs) | EquityInstruments (21,962) (32,855)      
Forfeited (in CPOs) | EquityInstruments (3,416) (4,102)      
Outstanding at end of year (in CPOs) | EquityInstruments 157,915 146,293 144,250    
To be paid by employees at end of year (in CPOs) | EquityInstruments 54,274 33,693      
Weighted-Average Exercise Price          
Outstanding at beginning of year (in pesos per CPO) | $ $ 75.85 $ 66.60      
Conditionally sold (in pesos per CPO) | $ 85.70 85.10      
Paid by employees (in pesos per CPO) | $ 44.89 36.84      
Forfeited (in pesos per CPO) | $ 86.40 83.16      
Outstanding at end of year (in pesos per CPO) | $ 79.75 75.85 $ 66.60    
To be paid by employees at end of year (in pesos per CPO) | $ $ 66.75 $ 46.28