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34. ASSETS AS HELD FOR SALE AND DISCONTINUED OPERATIONS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale R$ (1,850)    
Proceeds from disposal of equity interest 625    
Remeasurement at fair value of remaining equity interest 1,525    
Others 9    
Effects on the income statement, before taxes 309    
Income tax and social contribution tax (85)    
Net income after tax for the year from discontinued operations 224 R$ 363
Light [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (1,060)    
Remeasurement at fair value of remaining equity interest 1,258    
Effects on the income statement, before taxes 198    
Income tax and social contribution tax (47)    
Net income after tax for the year from discontinued operations 151    
Lightger [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (126)    
Remeasurement at fair value of remaining equity interest 128    
Effects on the income statement, before taxes 2    
Income tax and social contribution tax    
Net income after tax for the year from discontinued operations 2    
Guanhaes [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (141)    
Remeasurement at fair value of remaining equity interest 131    
Others 4    
Effects on the income statement, before taxes (6)    
Income tax and social contribution tax    
Net income after tax for the year from discontinued operations (6)    
Axxion [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (4)    
Remeasurement at fair value of remaining equity interest 4    
Others 5    
Effects on the income statement, before taxes 5    
Income tax and social contribution tax    
Net income after tax for the year from discontinued operations 5    
Itaocara [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (4)    
Remeasurement at fair value of remaining equity interest 4    
Effects on the income statement, before taxes    
Income tax and social contribution tax    
Net income after tax for the year from discontinued operations    
Profit Loss on Disposal Of Equity Interest [Member] | Light [Member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
Prior equity interest - Assets held for sale (515)    
Proceeds from disposal of equity interest 625    
Effects on the income statement, before taxes 110    
Income tax and social contribution tax (38)    
Net income after tax for the year from discontinued operations R$ 72