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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
IFRS Text Block [Abstract] |
Calculation of Basic and Diluted Earnings Per Share Amounts |
|  | 2020 |  | 2019 |  |  | 2018 |
|  | Per Series |  | Per Series |  | Per Series |  | Per Series |  | Per Series |  | Per Series |
|  | “B” Shares |  | “D” Shares |  | “B” Shares |  | “D” Shares |  | “B” Shares |  | “D” Shares |
(in millions of shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares for basic earnings per share |  |  | 9,243.59 |  |  | 8,633.38 |  |  | 9,244.16 |  |  | 8,635.65 |  |  | 9,243.81 |  |  | 8,634.26 |
Effect of dilution associated with non-vested shares for share based payment plans |  |  | 2.83 |  |  | 11.33 |  |  | 2.26 |  |  | 9.06 |  |  | 2.61 |  |  | 10.45 |
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) |  |  | 9,246.42 |  |  | 8,644.71 |  |  | 9,246.42 |  |  | 8,644.71 |  |  | 9,246.42 |  |  | 8,644.71 |
Dividend rights per series |  |  | 100 | % |  | 125 | % |  | 100 | % |  | 125 | % |  | 100 | % |  | 125 | %
(see Note 23.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares further adjusted to reflect dividend rights |  |  | 9,246.42 |  |  | 10,805.89 |  |  | 9,246.42 |  |  | 10,805.89 |  |  | 9,246.42 |  |  | 10,805.89 |
Basic earnings per share from continuing operations |  |  | (0.10) |  |  | (0.12) |  |  | 1.03 |  |  | 1.29 |  |  | 1.13 |  |  | 1.41 |
Basic earnings per share from discontinued operations |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.07 |  |  | 0.09 |
Diluted earnings per share from continuing operations |  |  | (0.10) |  |  | (0.12) |  |  | 1.03 |  |  | 1.29 |  |  | 1.13 |  |  | 1.41 |
Diluted earnings per share from discontinued operations |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.07 |  |  | 0.09 |
Allocation of earnings, weighted |  |  | 46.11 | % |  | 53.89 | % |  | 46.11 | % |  | 53.89 | % |  | 46.11 | % |  | 53.89 | %
Net controlling interest income allocated from continuing operations |  | Ps. | (890) |  | Ps. | (1,040) |  | Ps. | 9,545 |  | Ps. | 11,154 |  | Ps. | 10,403 |  | Ps. | 12,157 |
Net controlling interest income allocated from discontinued operations |  | Ps. | — |  | Ps. | — |  | Ps. | — |  | Ps. | — |  | Ps. | 660 |  | Ps. | 770 |

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