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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 13) - Credit Risk [Member]
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
A1 Rating [Member]  
Disclosure of credit risk exposure [line items]  
Bank equity R$ 3,500
Concentration Minimum of 50%
A1 Rating [Member] | Bottom Of Range [Member]  
Disclosure of credit risk exposure [line items]  
Percentage of limit per bank entity 6.00% [1]
A1 Rating [Member] | Top of Range [Member]  
Disclosure of credit risk exposure [line items]  
Percentage of limit per bank entity 9.00% [1]
A2 Rating [Member]  
Disclosure of credit risk exposure [line items]  
Concentration Maximum 30%
A2 Rating [Member] | Bottom Of Range [Member]  
Disclosure of credit risk exposure [line items]  
Bank equity R$ 100
Percentage of limit per bank entity 5.00% [1]
A2 Rating [Member] | Top of Range [Member]  
Disclosure of credit risk exposure [line items]  
Bank equity R$ 3,500
Percentage of limit per bank entity 8.00% [1]
B Rating [Member]  
Disclosure of credit risk exposure [line items]  
Concentration Maximum 30%
B Rating [Member] | Bottom Of Range [Member]  
Disclosure of credit risk exposure [line items]  
Bank equity R$ 400
Percentage of limit per bank entity 5.00% [1]
B Rating [Member] | Top of Range [Member]  
Disclosure of credit risk exposure [line items]  
Bank equity R$ 100
Percentage of limit per bank entity 7.00% [1]
[1] The percentage assigned to each bank depends on individual assessment of indicators, e.g. liquidity, and quality of the credit portfolio.