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v3.19.1

Equity Accounted Investees, Other Investments and Non-Current Accounts Receivable - Additional Information (Detail) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 28, 2017 MXN ($) shares | Jan. 25, 2017 USD ($) shares | Apr. 30, 2018 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
GCC [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage | 9.47% |  |  |  |  |
Gain (loss) on sale of business | $ 1,682 | $ 1,859,000,000 |  |  |  |
Number of shares sold | shares | 31,483,332 |  |  |  |  |
Share price |  | $ 95.00 |  |  |  |
Proceeds from sale | $ 3,012 |  |  |  |  |
GCC [member] | Private Placements Offering [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage |  | 13.53% |  |  |  |
Proceeds from sale of common stock |  | $ 4,094,000,000 |  |  |  |
Number of shares issued |  | 76,483,332 |  |  |  |
Number of shares sold | shares |  | 45,000,000 |  |  |  |
Camcem [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage |  |  |  | 40.10% | 40.10% |
Camcem [member] | Disposal groups classified as held for sale [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage | 20.00% |  |  |  |  |
ABC Capital, S.A. Institucion de Banca Multiple [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage |  |  | 33.90% | 0.00% | 0.00% |
Proceeds from sale of common stock |  |  | $ 105 |  |  |
Gain (loss) on sale of business |  |  | $ 157 |  |  |
Lehigh White Cement Company [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Ownership percentage |  |  |  | 36.80% | 36.80% | 24.50%
Equity method investment, additional investment |  |  |  | $ 707 | $ 36,000,000 |

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