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POST-EMPLOYMENT BENEFIT - Fair value of plan assets (Details) - Plan assets - Social security defined benefit plans - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Pension Benefits    
Fair value of assets at the beginning of the year R$ 23,780,227 R$ 27,983,826
Effects of Deconsolidation - Eletronuclear 0 (3,664,089)
Benefits paid during the year (2,635,428) (2,537,463)
Participant contributions paid during the year 0 (8,061)
Employer's contributions paid during the year 476,899 287,381
Gain/loss on plan assets (excluding interest income) 2,012,962 (526,396)
Expected return on assets for the year (2,355,299) (2,245,029)
Fair value of assets at the end of the year 25,989,959 23,780,227
Effective return on assets for the year R$ 4,368,261 R$ 1,718,633