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Earnings per Share - Summary of Basic and Diluted Earnings per Share (Parenthetical) (Detail) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2016
Series L share [member] |  |
Earnings per share- Equity holders of the parent (U.S. dollars and Mexican pesos): |  |
Effect of dilutive potential shares | 27.9 | 27.9

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- Definition Effect of dilution associated with commitment to deliver L series shares + References No definition available. + Details
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