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Capital Stock and Long-term Retention Plan - Stock awards (Details) - LTRP
EquityInstruments in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2021
EquityInstruments
$ / shares
shares
Dec. 31, 2020
EquityInstruments
$ / shares
shares
Dec. 31, 2019
EquityInstruments
$ / shares
Dec. 31, 2018
EquityInstruments
Dec. 31, 2017
EquityInstruments
Aug. 31, 2021
shares
Jun. 30, 2020
shares
Weighted-Average Exercise Price              
Weighted-average remaining contractual life of the awards 1 year 3 months 10 days 1 year 4 months 17 days          
CPOs              
CPOs or CPOs Equivalent              
Outstanding at beginning of year (in CPOs) | EquityInstruments 160,365 243,472          
Conditionally sold (in CPOs) | EquityInstruments 38,800 39,200 72,558 32,500 37,000    
Paid by employees (in CPOs) | EquityInstruments (8,633)            
Forfeited (in CPOs) | EquityInstruments (13,674) (122,307)          
Outstanding at end of year (in CPOs) | EquityInstruments 176,858 160,365 243,472        
To be paid by employees at end of year (in CPOs) | EquityInstruments 60,155 23,361          
Weighted-Average Exercise Price              
Outstanding at beginning of year (in pesos per CPO) | $ / shares $ 39.36 $ 65.19          
Conditionally sold | $ / shares 8.62 6.84          
Paid by employees (in pesos per CPO) | $ / shares 38.30            
Forfeited (in pesos per CPO) | $ / shares 64.96 81.36          
Outstanding at end of year (in pesos per CPO) | $ / shares 31.22 39.36 $ 65.19        
To be paid by employees at end of year (in pesos per CPO) | $ / shares $ 52.69 $ 80.72          
Number Of Ordinary Participant Certificates Or Their Equivalent Owned | shares           1.0  
Number of other equity instruments held in connection of with forfeited rights | shares 7.5 27.4         8.6