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Capital Stock and Long-term Retention Plan - Capital Stock (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 MXN ($) item $ / shares shares | Dec. 31, 2019 MXN ($) shares | Dec. 31, 2018 MXN ($) shares
Classes of share capital |  |  |
Number of classes of capital stock | item | 4 |  |
Number of shares in each CPO | 117 |  |
Number of CPOs in each GDS | 5 |  |
Authorized (in shares) | 357,307,300,000 |  |
Total number of shares issued | 357,307,300,000 |  |
Repurchased (in shares) | (5,173,200,000) |  |
Held by trust (in shares) | (26,141,600,000) |  |
Outstanding (in shares) | 325,992,500,000 | 337,244,300,000 | 338,329,100,000
Shares in the form of CPOs, Authorized and Issued | 296,023,000,000 |  |
Shares in the form of CPOs, Repurchased | 5,173,200,000 |  |
Shares in the form of CPOs, Held by trust | 20,004,200,000 |  |
Shares in the form of CPOs, Outstanding | 270,845,600,000 |  |
Shares not in the form of CPOs, Authorized and Issued | 61,284,300,000 |  |
Shares not in the form of CPOs, Held by trust | 6,137,400,000 |  |
Shares not in the form of CPOs, Outstanding | 55,146,900,000 |  |
Issued capital | $ | $ 4,907,765 | $ 4,907,765 |
Authorized capital | $ | 2,459,154 |  |
Shares repurchased | $ | $ 195,597 | $ 1,385,750 | $ 1,541,180
Series "A" Shares |  |  |
Classes of share capital |  |  |
Par value of shares | $ / shares | $ 0 |  |
Number of shares in each CPO | 25 |  |
Authorized (in shares) | 122,179,400,000 |  |
Total number of shares issued | 122,179,400,000 |  |
Repurchased (in shares) | (1,105,400,000) |  |
Held by trust (in shares) | (8,054,800,000) |  |
Outstanding (in shares) | 113,019,200,000 | 116,223,900,000 | 116,207,200,000
Series "B" Shares |  |  |
Classes of share capital |  |  |
Par value of shares | $ / shares | $ 0 |  |
Number of shares in each CPO | 22 |  |
Authorized (in shares) | 58,019,700,000 |  |
Total number of shares issued | 58,019,700,000 |  |
Repurchased (in shares) | (972,800,000) |  |
Held by trust (in shares) | (6,118,400,000) |  |
Outstanding (in shares) | 50,928,500,000 | 52,852,800,000 | 53,116,100,000
CPOs |  |  |
Classes of share capital |  |  |
Authorized (in shares) | 2,530,100,000 |  |
Total number of shares issued | 2,530,100,000 |  |
Repurchased (in shares) | (44,200,000) |  |
Held by trust (in shares) | (171,000,000) |  |
Outstanding (in shares) | 2,314,900,000 | 2,402,400,000 | 2,414,400,000
Shares in the form of CPOs, Repurchased | 616,000,000 | (4,557,200,000) |
Shares repurchased | $ | $ 5,300 | $ 38,900 |
Series "D" Shares |  |  |
Classes of share capital |  |  |
Par value of shares | $ / shares | $ 0 |  |
Number of shares in each CPO | 35 |  |
Authorized (in shares) | 88,554,100,000 |  |
Total number of shares issued | 88,554,100,000 |  |
Repurchased (in shares) | (1,547,500,000) |  |
Held by trust (in shares) | (5,984,200,000) |  |
Outstanding (in shares) | 81,022,400,000 | 84,083,800,000 | 84,502,900,000
Series "L" Shares |  |  |
Classes of share capital |  |  |
Par value of shares | $ / shares | $ 0 |  |
Number of shares in each CPO | 35 |  |
Authorized (in shares) | 88,554,100,000 |  |
Total number of shares issued | 88,554,100,000 |  |
Repurchased (in shares) | (1,547,500,000) |  |
Held by trust (in shares) | (5,984,200,000) |  |
Outstanding (in shares) | 81,022,400,000 | 84,083,800,000 | 84,502,900,000

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