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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Effect of Adoption of IFRS 9 in Retained Earnings and Other Components of Equity (Detail) $ in Thousands, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Deferred tax assets | $ 111,186,768 | $ 5,649 |  | $ 116,571,349 | $ 112,651,699 |
Total assets | 1,429,223,392 | 72,613 |  | 1,486,211,852 | 1,515,042,274 |
Equity |  |  |  |  |  |
Retained earnings | 237,255,485 | 12,053 |  | 171,087,598 |  |
Total adjustment on equity | $ 245,872,422 | $ 12,492 |  | $ 260,633,517 | $ 271,023,767 | $ 160,854,186
Adjustments [member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Trade receivables |  |  | $ (2,400,783) |  |  |
Deferred tax assets |  |  | 544,628 |  |  |
Total assets |  |  | (1,856,155) |  |  |
Equity |  |  |  |  |  |
Retained earnings |  |  | (1,856,155) |  |  |
Total adjustment on equity |  |  | $ (1,856,155) |  |  |

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