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v3.21.1

Commitments - Additional Information (Detail) T in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Jul. 27, 2012 | Apr. 30, 2016 MWh | Feb. 28, 2010 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) T MWh $ / MWh | Dec. 31, 2018 USD ($)
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Self-insured health care benefits |  |  |  |  | $ 61,000,000 | $ 62,000,000 | $ 62,000,000
Cost per megawatt hour | $ / MWh |  |  |  |  |  | 25.375 |
MX [Member] | Energy Financial Hedge [Member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Period of hedging agreement | 20 years |  |  |  |  |  |
Electric energy expected consumption | MWh |  |  |  |  |  | 400,000 |
Percentage increase in the price of the commodity |  |  |  |  |  | 1.50% |
Proceeds payments from financial hedge |  |  |  |  | 400,000 |  |
Bottom of range [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Stop-loss limits value under medical assistance |  |  |  |  | 23,000 |  |
Bottom of range [member] | Employees [Member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Stop-loss limits value under medical assistance |  |  |  |  | 100,000 |  |
Top of range [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Stop-loss limits value under medical assistance |  |  |  |  | 550,000 |  |
Top of range [member] | Employees [Member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Stop-loss limits value under medical assistance |  |  |  |  | 2,500,000 |  |
International Business Machines Corporation [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Strategic agreement period |  | 10-year |  |  |  |  |
Ventikas [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Acquired energy usage period |  |  | 20 years |  |  |  |
Estimated annual cost |  |  |  |  | 24,000,000 |  |
Combined generation capacity | MWh |  |  | 252 |  |  |  |
EURUS [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Acquired energy usage period |  |  |  | 20 years |  |  |
Estimated annual cost |  |  |  |  | 67,000,000 |  |
Installed capacity |  |  |  | 250 MW |  |  |
Termoelectrica del Golfo [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Estimated annual cost |  |  |  |  | 124,000,000 |  |
Combined volume allocate to TEG and other energy producer | T |  |  |  |  |  | 1.2 |
CEMEX Ostzement GmbH [member] |  |  |  |  |  |  |
Disclosure of Commitments and Contingencies [Line Items] |  |  |  |  |  |  |
Estimated annual cost |  |  |  |  | $ 17,000,000 |  |

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