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Bank Loans and Notes Payables - Summary of Reconciliation of Liabilities Arising From Financing Activities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 $ 88,909   $ 66,730  
Cash flow payments (13,109) $ (668) (4,948) $ (9,076)
Cash flow Proceeds 12,488 $ 636 8,040 1,907
Non-cash flows foreign exchange movements 4,205   10,296  
Non- cash flows translation Effect (9,133)   8,791  
Carrying value at December , 2017 83,360   88,909 66,730
Short-term borrowings [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 1,573   384  
Cash flow payments (1,013)      
Cash flow Proceeds 489   851  
Non- cash flows translation Effect 1,008   338  
Carrying value at December , 2017 2,057   1,573 384
Short-term borrowings [member] | Short term bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 1,573   384  
Cash flow payments (1,013)      
Cash flow Proceeds 489   851  
Non- cash flows translation Effect 1,008   338  
Carrying value at December , 2017 2,057   1,573 384
Long-term borrowings [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 87,336   66,346  
Cash flow payments (12,096)   (4,948)  
Cash flow Proceeds 11,999   7,189  
Non-cash flows foreign exchange movements 4,205   10,296  
Non- cash flows translation Effect (10,141)   8,453  
Carrying value at December , 2017 81,303   87,336 66,346
Long-term borrowings [member] | Long term bank loans [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 8,594   2,068  
Cash flow payments (2,264)   (1,988)  
Cash flow Proceeds 1,999   141  
Non-cash flows foreign exchange movements 190   (50)  
Non- cash flows translation Effect (1,956)   8,423  
Carrying value at December , 2017 6,563   8,594 2,068
Long-term borrowings [member] | Long term notes payable [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 78,742   63,818  
Cash flow payments (9,832)   (2,500)  
Cash flow Proceeds 10,000   7,048  
Non-cash flows foreign exchange movements 4,015   10,346  
Non- cash flows translation Effect (8,185)   30  
Carrying value at December , 2017 74,740   78,742 63,818
Long-term borrowings [member] | Long- term lease liabilities [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016     460  
Cash flow payments     (460)  
Carrying value at December , 2017       460
Current portion of long term debt [member]        
Disclosure of reconciliation of liabilities arising from financing activities [line items]        
Carrying value at December 31, 2016 1,479   3,086  
Carrying value at December , 2017 $ 10,114   $ 1,479 $ 3,086