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Pensions and Post-Employment Benefits - Schedule of Reconciliations of the Actuarial Benefits Obligations, Pension Plan Assets, And Liabilities Recognized in the Balance Sheet (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period $ 52,219 $ 43,840  
Service cost 254 176 $ 158
Interest cost 1,701 1,744  
Actuarial (gains) losses 703 6,298  
Additions through business combinations 3,072 0  
Settlements and curtailments 0 (19)  
Plan amendments 15 8  
Benefits paid (3,001) (2,453)  
Foreign currency translation 1,383 2,625  
Projected benefit obligation at end of the period 56,346 52,219 43,840
Fair value of plan assets at beginning of the period 28,854 25,571  
Return on plan assets 934 976  
Actuarial (gains) losses for the period 706 2,279  
Employer contributions 1,575 1,382  
Additions through business combinations 2,841 0  
Reduction for disposal of assets (4) 0  
Settlements and curtailments 0 (19)  
Benefits paid (3,001) (2,453)  
Foreign currency translation 788 1,118  
Fair value of plan assets at end of the period 32,693 28,854 25,571
Net projected liability recognized in the statement of financial position 23,653 23,365  
Pensions [Member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 51,055 42,740  
Service cost 221 151 128
Interest cost 1,625 1,685  
Actuarial (gains) losses 727 6,263  
Additions through business combinations 2,801 0  
Settlements and curtailments 0 0  
Plan amendments 15 8  
Benefits paid (2,920) (2,379)  
Foreign currency translation 1,386 2,587  
Projected benefit obligation at end of the period 54,910 51,055 42,740
Fair value of plan assets at beginning of the period 28,828 25,547  
Return on plan assets 932 974  
Actuarial (gains) losses for the period 707 2,278  
Employer contributions 1,494 1,289  
Additions through business combinations 2,841 0  
Reduction for disposal of assets (4) 0  
Settlements and curtailments 0 0  
Benefits paid (2,920) (2,379)  
Foreign currency translation 787 1,119  
Fair value of plan assets at end of the period 32,665 28,828 25,547
Net projected liability recognized in the statement of financial position 22,245 22,227  
Other Benefits Plans [Member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 1,164 1,100  
Service cost 33 25 30
Interest cost 76 59  
Actuarial (gains) losses (24) 35  
Additions through business combinations 271 0  
Settlements and curtailments 0 (19)  
Plan amendments 0 0  
Benefits paid (81) (74)  
Foreign currency translation (3) 38  
Projected benefit obligation at end of the period 1,436 1,164 1,100
Fair value of plan assets at beginning of the period 26 24  
Return on plan assets 2 2  
Actuarial (gains) losses for the period (1) 1  
Employer contributions 81 93  
Additions through business combinations 0 0  
Reduction for disposal of assets 0 0  
Settlements and curtailments 0 (19)  
Benefits paid (81) (74)  
Foreign currency translation 1 (1)  
Fair value of plan assets at end of the period 28 26 $ 24
Net projected liability recognized in the statement of financial position $ 1,408 $ 1,138