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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