XML 153 R138.htm IDEA: XBRL DOCUMENT v3.21.1
Financial Instruments - Summary of Net Effects of Expired Contracts Met Hedging Criteria (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
 [1]
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Interest expense $ 397 $ 7,894 $ 6,904 [2] $ 7,568
Foreign exchange $ 0 4 (330) [2] (277)
Derivatives designated as hedges | Cross currency swaps and interest rate swaps        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Interest expense   109 199 157
Foreign exchange   1,212 480 642
Derivatives designated as hedges | Interest rate swaps        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Interest expense   163 515 0
Derivatives designated as hedges | Option to purchase foreign currency        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Cost of good sold   8 (63) (8)
Derivatives designated as hedges | Forward agreements to purchase foreign currency        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Cost of good sold   839 (163) 240
Derivatives designated as hedges | Commodity Price contracts        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Cost of good sold   (129) (391) (258)
Derivatives designated as hedges | Treasury locks        
Disclosure of net effects of expired contracts that met hedging criteria [line items]        
Interest expense   $ 153 $ 0 $ 0
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18