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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, 2017 | Dec. 31, 2016
Disclosure of other provisions [line items] |  |
Balance at beginning of period | $ 28,762 | $ 25,611
Business combinations | 345 | 0
Additions or increase in estimates | 41,054 | 67,684
Releases or decrease in estimates | (41,700) | (61,362)
Reclassifications | (1,114) | (741)
Accretion expense | (1,021) | (1,042)
Foreign currency translation | 1,990 | (1,388)
Balance at end of period | 28,316 | 28,762
Current provisions | 12,667 | 11,716
Asset retirement obligations [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 8,237 |
Business combinations | 0 |
Additions or increase in estimates | 573 |
Releases or decrease in estimates | (527) |
Reclassifications | 0 |
Accretion expense | (191) |
Foreign currency translation | (186) |
Balance at end of period | 7,906 | 8,237
Current provisions | 0 |
Environmental liability [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 1,172 |
Business combinations | 0 |
Additions or increase in estimates | 21 |
Releases or decrease in estimates | (54) |
Reclassifications | (182) |
Accretion expense | 0 |
Foreign currency translation | 34 |
Balance at end of period | 991 | 1,172
Current provisions | 0 |
Legal proceedings provision [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 1,514 |
Business combinations | 0 |
Additions or increase in estimates | 701 |
Releases or decrease in estimates | (289) |
Reclassifications | 530 |
Accretion expense | 0 |
Foreign currency translation | (857) |
Balance at end of period | 1,599 | 1,514
Current provisions | 0 |
Valuation derivative instruments [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 823 |
Business combinations | 0 |
Additions or increase in estimates | 214 |
Releases or decrease in estimates | (306) |
Reclassifications | 0 |
Accretion expense | 0 |
Foreign currency translation | (310) |
Balance at end of period | 421 | 823
Current provisions | 19 |
Other liabilities and provisions [Member] |  |
Disclosure of other provisions [line items] |  |
Balance at beginning of period | 17,016 |
Business combinations | 345 |
Additions or increase in estimates | 39,545 |
Releases or decrease in estimates | (40,524) |
Reclassifications | (1,462) |
Accretion expense | (830) |
Foreign currency translation | 3,309 |
Balance at end of period | 17,399 | $ 17,016
Current provisions | $ 12,648 |

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