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Employee Benefits - Summary of Net Defined Benefit Liability Asset (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) $ 3,688 $ 4,239  
Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 661 674  
Post retirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 350 460  
Net benefit cost recognized in the consolidated statements of income [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 468 374 $ 359
Gain or Loss on Settlement or Curtailment (14) (3) (61)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 387 319 282
Net benefit cost recognized in the consolidated statements of income [member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 318 244 245
Gain or Loss on Settlement or Curtailment (5) (2) (61)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 304 248 224
Net benefit cost recognized in the consolidated statements of income [member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 125 106 93
Gain or Loss on Settlement or Curtailment (8) (1)  
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 49 41 34
Net benefit cost recognized in the consolidated statements of income [member] | Post retirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 25 24 21
Gain or Loss on Settlement or Curtailment (1)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 34 $ 30 $ 24
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 429    
Gain or Loss on Settlement or Curtailment (12)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 382    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 284    
Gain or Loss on Settlement or Curtailment (4)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 291    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 121    
Gain or Loss on Settlement or Curtailment (7)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 53    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 24    
Gain or Loss on Settlement or Curtailment (1)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 38    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 440    
Gain or Loss on Settlement or Curtailment (14)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 349    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 309    
Gain or Loss on Settlement or Curtailment (6)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 296    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 131    
Gain or Loss on Settlement or Curtailment (8)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 53    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Medical cost trend rates [Member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 29    
Gain or Loss on Settlement or Curtailment (1)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 41    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 481    
Gain or Loss on Settlement or Curtailment (15)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 342    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 324    
Gain or Loss on Settlement or Curtailment (6)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 261    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 129    
Gain or Loss on Settlement or Curtailment (8)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 46    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 28    
Gain or Loss on Settlement or Curtailment (1)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 35    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 404    
Gain or Loss on Settlement or Curtailment (10)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 286    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 284    
Gain or Loss on Settlement or Curtailment (3)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 239    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 120    
Gain or Loss on Settlement or Curtailment (7)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 47    
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 24    
Gain or Loss on Settlement or Curtailment (1)    
Effect of Net Interest on the Net Defined Benefit Liability (Asset) 34    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Discount rates [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 332    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Discount rates [member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 391    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Discount rates [member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) (79)    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Discount rates [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 20    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Future salary growth [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 543    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Future salary growth [Member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 610    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Future salary growth [Member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) (67)    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Medical cost trend rates [Member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 33    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Discount rates [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 547    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Discount rates [member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 571    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Discount rates [member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) (61)    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Discount rates [member] | Postretirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 37    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Future salary growth [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 372    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Future salary growth [Member] | Pension and retirement plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) 444    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Future salary growth [Member] | Seniority premiums [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) (72)    
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Remeasurements of the Net Defined Benefit Liabilility (Assets) $ 23