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Financial Instruments - Summary of Maturity Analysis for Non-derivative and Derivative Financial Liabilities (Detail) - Liquidity risk [member] - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Percentage of outstanding consolidated total indebtedness at the level of its sub-holding companies | 50.20% | 64.30%
0-1 year [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | $ 5,646 |
Loans from banks | 6,605 |
IFRS 16 lease obligations | 89 |
Derivative financial liabilities | 1,621 |
Second 12 months |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | 4,981 |
Loans from banks | 1,310 |
IFRS 16 lease obligations | 53 |
Derivative financial liabilities | 1,472 |
Third 12 months |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | 45,553 |
Loans from banks | 558 |
IFRS 16 lease obligations | 38 |
Derivative financial liabilities | (3,700) |
Fourth 12 months |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | 2,746 |
Loans from banks | 2,825 |
IFRS 16 lease obligations | 31 |
Derivative financial liabilities | 1,185 |
Fifth 12 months |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | 4,306 |
Loans from banks | 3,772 |
IFRS 16 lease obligations | 24 |
Derivative financial liabilities | 2,546 |
Later than 5 years [member] |  |
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items] |  |
Notes and bonds | 191,771 |
Loans from banks | 5,640 |
Derivative financial liabilities | $ (10,457) |

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