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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