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Earnings per Share - Summary of Basic and Diluted Earnings per Share (Detail) shares in Millions, $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 MXN ($) shares | Dec. 31, 2016 MXN ($) shares
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |  |  |
Consolidated net (loss) income | $ 15,070 | $ 768 | $ (11,654) | $ 10,527
Consolidated net income (loss) attributable to equity holders of the parent- continuing operations | 10,936 | 557 | (16,058) | 10,070
Consolidated net income (loss) attributable to equity holders of the parent- discontinued operation | 2,975 | $ 152 | 3,256 |
Series A shares [member] |  |  |  |
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |  |  |
Consolidated net (loss) income | 7,116 |  | (5,519) | 5,038
Consolidated net income (loss) attributable to equity holders of the parent- continuing operations | 5,164 |  | (7,606) |
Consolidated net loss attributable to equity holders of the parent- continuing operations |  |  |  | $ 4,819
Consolidated net income (loss) attributable to equity holders of the parent- discontinued operation | $ 1,405 |  | $ 1,542 |
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) (1) | shares |  |  |  | 7,937
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 7,937 | 7,937 | 7,937 |
Series D share [member] |  |  |  |
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |  |  |
Consolidated net (loss) income | $ 4,186 |  | $ (3,247) | $ 2,963
Consolidated net income (loss) attributable to equity holders of the parent- continuing operations | 3,038 |  | (4,474) |
Consolidated net loss attributable to equity holders of the parent- continuing operations |  |  |  | $ 2,835
Consolidated net income (loss) attributable to equity holders of the parent- discontinued operation | $ 826 |  | $ 907 |
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) (1) | shares |  |  |  | 4,668
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 4,668 | 4,668 | 4,668 |
Series B Shares [member] |  |  |  |
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |  |  |
Consolidated net (loss) income | $ 1,413 |  | $ (1,083) | $ 950
Consolidated net income (loss) attributable to equity holders of the parent- continuing operations | 1,025 |  | (1,492) |
Consolidated net loss attributable to equity holders of the parent- continuing operations |  |  |  | $ 906
Consolidated net income (loss) attributable to equity holders of the parent- discontinued operation | $ 279 |  | $ 303 |
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) (1) | shares |  |  |  | 1,492
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 1,576 | 1,576 | 1,557 |
Series L share [member] |  |  |  |
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |  |  |
Consolidated net (loss) income | $ 2,355 |  | $ (1,805) | $ 1,576
Consolidated net income (loss) attributable to equity holders of the parent- continuing operations | 1,709 |  | (2,486) |
Consolidated net loss attributable to equity holders of the parent- continuing operations |  |  |  | $ 1,510
Consolidated net income (loss) attributable to equity holders of the parent- discontinued operation | $ 465 |  | $ 504 |
Weighted average number of shares adjusted for the effect of dilution (Shares outstanding) (1) | shares |  |  |  | 2,486
Weighted average number of shares for basic earnings per share (millions of shares) | shares | 2,626 | 2,626 | 2,595 |

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