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Trade Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Trade Accounts Receivable
As of December 31, 2020 and 2019, consolidated trade accounts receivable consisted of:
 
       
2020
  
2019
 
Trade accounts receivable
  $     1,654   1,637 
Allowances for expected credit losses
     (121)   (116) 
    
 
 
  
 
 
 
  $     1,533   1,521 
    
 
 
  
 
 
 
Summary of Trade Accounts Receivable and Allowance for Expected Credit Loss
 
As of December 31, 2020, the balances of trade accounts receivable and the allowance for Expected Credit Losses (“ECL”) were as follows:
 
       
Accounts
receivable
   
ECL
allowance
   
ECL average
rate
 
Mexico
  $     284    38    13.7% 
United States
     477    8    1.7% 
Europe, Middle East, Africa and Asia
     766    51    6.7% 
South, Central America and the Caribbean
     94    20    21.3% 
Others
     33    4    12.1% 
    
 
 
   
 
 
   
  $     1,654    121   
    
 
 
   
 
 
   
Summary of Allowance for Expected Credit Losses
Changes in the allowance for expected credit losses in 2020, 2019 and 2018, were as follows:
 
       
2020
  
2019
  
2018
 
Allowances for expected credit losses at beginning of period
  $     116   119   109 
Adoption effects of ECL model as of January 1, 2018
     —     —     29 
Charged to selling expenses
     23   12   8 
Deductions
     (19)   (16)   (20) 
Foreign currency translation effects
     1   1   (7) 
    
 
 
  
 
 
  
 
 
 
Allowances for expected credit losses at end of period
  $     121   116   119