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Other Current and Non-current Liabilities - Changes in Consolidated Other Current and Non-current Liabilities (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [line items] |  |
Balance at beginning of period | $ 28,540 | $ 28,937
Business combinations | 0 | 345
Additions or increase in estimates | 27,156 | 41,137
Releases or decrease in estimates | (28,568) | (41,700)
Reclassifications | (378) | (1,148)
Accretion expense | (1,088) | (1,021)
Foreign currency translation | 627 | 1,990
Balance at end of period | 26,289 | 28,540
Current provisions | 11,284 | 12,891
Asset retirement obligations [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 7,906 |
Business combinations | 0 |
Additions or increase in estimates | 1,355 |
Releases or decrease in estimates | (916) |
Reclassifications | (22) |
Accretion expense | (186) |
Foreign currency translation | (124) |
Balance at end of period | 8,013 | 7,906
Current provisions | 297 |
Environmental liability [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 991 |
Business combinations | 0 |
Additions or increase in estimates | 11 |
Releases or decrease in estimates | (4) |
Reclassifications | (384) |
Accretion expense | 0 |
Foreign currency translation | (41) |
Balance at end of period | 573 | 991
Current provisions | 0 |
Legal proceedings provision [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 1,599 |
Business combinations | 0 |
Additions or increase in estimates | 136 |
Releases or decrease in estimates | (807) |
Reclassifications | 0 |
Accretion expense | 0 |
Foreign currency translation | (49) |
Balance at end of period | 879 | 1,599
Current provisions | 0 |
Valuation derivative instruments [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 421 |
Business combinations | 0 |
Additions or increase in estimates | 275 |
Releases or decrease in estimates | 0 |
Reclassifications | (96) |
Accretion expense | 0 |
Foreign currency translation | 78 |
Balance at end of period | 678 | 421
Current provisions | 272 |
Other liabilities and provisions [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 17,623 |
Business combinations | 0 |
Additions or increase in estimates | 25,379 |
Releases or decrease in estimates | (26,841) |
Reclassifications | 124 |
Accretion expense | (902) |
Foreign currency translation | 763 |
Balance at end of period | 16,146 | $ 17,623
Current provisions | $ 10,715 |

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