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26. POST-EMPLOYMENT OBLIGATIONS (Details 9) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan R$ 925 R$ 1,077
Non Convertible Debentures Issued By The Company [Member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 398 380
Shares Issued By The Company [Member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 24 35
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$ 503 R$ 662