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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
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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 |  |  |

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