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Operating Costs and Expenses - Schedule of Operating Costs and Expenses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale R$ 14,648 R$ 14,614 R$ 16,101
Basic network usage charges 2,937 2,671 3,337
Gas purchased for resale 2,237 2,735 2,011
Total costs of energy and gas 19,822 20,020 21,449
Supply from itaipu binacional [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 1,207 1,644 1,946
Physical guarantee quota contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 918 925 832
Quotas for Angra I and II nuclear plants [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 364 357 244
Spot market [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 478 530 1,224
Proinfa program [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 511 598 401
Bilateral contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 510 493 418
Energy acquired in regulated market auctions [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 3,940 3,334 6,242
Energy acquired in the free market [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale [1] 5,612 6,003 4,976
Distributed generation ('geracao distribuida') [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 2,331 1,977 1,268
PIS/pasep and cofins credits [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale (1,223) (1,247) (1,450)
Basic network usage charges (337) (304) (367)
Transmission Charges Basic Grid [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Basic network usage charges 3,220 2,925 3,663
Distribution Charges [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Basic network usage charges R$ 54 R$ 50 R$ 41
[1] The energy acquired in the free environment by the Parent Company derives from the contracts transferred by Cemig GT, as a result of the process of partial segregation of the Company's energy trading business.