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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period $ 56,346 $ 52,219  
Service cost 228 254 $ 176
Interest cost 1,695 1,701  
Actuarial (gains) losses (5,118) 703  
Additions through business combinations 111 3,072  
Reduction from disposal of assets (9) 0  
Plan amendments 168 (55)  
Benefits paid (2,909) (3,001)  
Foreign currency translation (2,256) 1,453  
Projected benefit obligation at end of the period 48,256 56,346 52,219
Fair value of plan assets at beginning of the period 32,693 28,854  
Return on plan assets 920 934  
Actuarial (gains) losses (1,714) 706  
Employer contributions 1,664 1,575  
Additions through business combinations 0 2,841  
Reduction for disposal of assets 0 (4)  
Benefits paid (2,909) (3,001)  
Foreign currency translation (1,335) 788  
Fair value of plan assets at end of the period 29,319 32,693 28,854
Net projected liability in the statement of financial position 18,937 23,653  
Pension defined benefit plans [member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 54,910 51,055  
Service cost 193 221 151
Interest cost 1,608 1,625  
Actuarial (gains) losses (5,126) 727  
Additions through business combinations 0 2,801  
Reduction from disposal of assets (9) 0  
Plan amendments 168 (55)  
Benefits paid (2,807) (2,920)  
Foreign currency translation (2,226) 1,456  
Projected benefit obligation at end of the period 46,711 54,910 51,055
Fair value of plan assets at beginning of the period 32,665 28,828  
Return on plan assets 917 932  
Actuarial (gains) losses (1,711) 707  
Employer contributions 1,562 1,494  
Additions through business combinations 0 2,841  
Reduction for disposal of assets 0 (4)  
Benefits paid (2,807) (2,920)  
Foreign currency translation (1,335) 787  
Fair value of plan assets at end of the period 29,291 32,665 28,828
Net projected liability in the statement of financial position 17,420 22,245  
Other Benefits Plans [Member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 1,436 1,164  
Service cost 35 33 25
Interest cost 87 76  
Actuarial (gains) losses 8 (24)  
Additions through business combinations 111 271  
Reduction from disposal of assets 0 0  
Plan amendments 0 0  
Benefits paid (102) (81)  
Foreign currency translation (30) (3)  
Projected benefit obligation at end of the period 1,545 1,436 1,164
Fair value of plan assets at beginning of the period 28 26  
Return on plan assets 3 2  
Actuarial (gains) losses (3) (1)  
Employer contributions 102 81  
Additions through business combinations 0 0  
Reduction for disposal of assets 0 0  
Benefits paid (102) (81)  
Foreign currency translation 0 1  
Fair value of plan assets at end of the period 28 28 $ 26
Net projected liability in the statement of financial position $ 1,517 $ 1,408