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23. TAXES PAYABLE AND AMOUNTS TO BE REFUNDED TO CUSTOMERS (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of taxes, income tax and social contribution tax [abstract]  
Schedule of taxes and amounts to be restituted to customers

    2019          2018   
Current               
ICMS    112       168  
COFINS    135       146  
PASEP    29       32  
INSS    25       23  
Others (1)    58       41  
    359       410  
Non-current               
COFINS    1       25  
PASEP    -       4  
    1       29  
    360       439  
Amounts to be refunded to customers               
Non-current               
PASEP/COFINS    4,193       1,124  
    4,193       1,124  
               

(1)      This includes the withholding income tax on Interest on equity paid in January 2020, in accordance with the tax legislation.