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24. POST-EMPLOYMENT OBLIGATIONS (Details 9) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan R$ 627 R$ 925
Non convertible debentures issued by the company [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 338 398
Shares issued by the company [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 4 24
Real estate properties of the foundation occupied by the company [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan R$ 285 R$ 503