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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Cash and Cash Equivalents
As of December 31, 2021 and 2020, consolidated cash and cash equivalents consisted of:
 
 
  
2021
 
  
2020
 
Cash and bank accounts
    $ 367        501  
Fixed-income securities and other cash equivalents
      246        449  
      
 
     
 
 
  
     $ 613        950