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Loans and Debentures - Schedule of Loans and Debentures (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 27, 2024
Sep. 27, 2024
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]        
Value R$ 200 R$ 2,436    
(-) Transaction costs   R$ (64)    
Current     R$ 2,877 R$ 776
Non-current     9,403 7,201
Total     12,280 7,977
Current     2,877 2,630
Non-current     9,403 7,201
Total     12,280 9,831
Transaction Costs [Member]        
IfrsStatementLineItems [Line Items]        
Current     (7) 2
Non-current     (138) 41
Total     R$ (145) (43)
Debentures - 3rd Issue - 3rd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity [1]     2025  
Annual financial cost     IPCA + 5.10%  
Currency     R$  
Current     R$ 334 331
Non-current     304
Total     R$ 334 635
Debentures - 7th Issue - 1st Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2024  
Annual financial cost     CDI + 0.45%  
Currency     R$  
Current     271
Non-current    
Total     271
Debentures - 7th Issue - 2nd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2026  
Annual financial cost     IPCA + 4.10%  
Currency     R$  
Current     R$ 1,026 3
Non-current     1,023 1,945
Total     R$ 2,049 1,948
Debentures - 8th Issue - 1st Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2027  
Annual financial cost     CDI + 1.35%  
Currency     R$  
Current     R$ 3 2
Non-current     500 500
Total     R$ 503 502
Debentures - 8th Issue - 2nd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2029  
Annual financial cost     IPCA + 6.10%  
Currency     R$  
Current     R$ 1 1
Non-current     556 529
Total     R$ 557 530
Debentures - 9th Issue - Single Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2026  
Annual financial cost     CDI + 2.05%  
Currency     R$  
Current     R$ 1,030 32
Non-current     1,000 2,000
Total     R$ 2,030 2,032
Debentures - 10th Issue - 1st Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2029  
Annual financial cost     CDI + 0.80%  
Currency     R$  
Current     R$ 17
Non-current     400
Total     R$ 417
Debentures - 10th Issue - 2nd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2034  
Annual financial cost     IPCA + 6.15%  
Currency     R$  
Current     R$ 38
Non-current     1,659
Total     R$ 1,697
Debentures - 11th Issue - 1st Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity   2031 2031  
Annual financial cost   CDI + 0.55% CDI + 0.55%  
Value   R$ 1,000    
Currency     R$  
Current     R$ 29
Non-current     1,000
Total     R$ 1,029
Debentures - 11th Issue - 2nd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity   2036 2036  
Annual financial cost   IPCA + 6.5769% IPCA + 6.58%  
Value   R$ 1,500    
Currency     R$  
Current     R$ 25
Non-current     1,528
Total     R$ 1,553
Debentures - 8th Issue - Single series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity [2]     2031  
Annual financial cost     IPCA + 5.27%  
Currency     R$  
Current     R$ 146 134
Non-current     880 958
Total     R$ 1,026 1,092
Debentures - 9th Issue - Single series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity 2029   2029  
Annual financial cost CDI + 0.47%   CDI + 0.47%  
Value R$ 200      
Currency     R$  
Current    
Non-current     200
Total     R$ 200
Debentures - 9th Issue - 1st Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2027  
Annual financial cost     CDI + 1.33%  
Currency     R$  
Current     R$ 237 3
Non-current     467 700
Total     R$ 704 703
Debentures - 9th Issue - 2nd Series [Member]        
IfrsStatementLineItems [Line Items]        
Principal maturity     2029  
Annual financial cost     IPCA + 7.63%  
Currency     R$  
Current     R$ 1 1
Non-current     331 315
Total     332 316
(-) Discount on the issuance of debentures [Member]        
IfrsStatementLineItems [Line Items]        
Current     (3) [3]
Non-current     (3) 9
Total     (6) (9)
Foreign Currency [member]        
IfrsStatementLineItems [Line Items]        
Current     1,854
Non-current      
Total     1,854
Foreign Currency [member] | Eurobonds [member]        
IfrsStatementLineItems [Line Items]        
Principal maturity [4]     2024  
Annual financial cost     9.25  
Currency     U$$  
Current     1,857
Non-current    
Total     1,857
Foreign Currency [member] | Transaction Costs [Member]        
IfrsStatementLineItems [Line Items]        
Current     1
Non-current      
Total     (1)
Foreign Currency [member] | Interest Paid In Advance [Member]        
IfrsStatementLineItems [Line Items]        
Current     [5] 2
Non-current      
Total     R$ (2)
[1] Cemig Distribuição;
[2] Debentures issued by Gasmig.
[3] Discount on the sale price of the 2nd series of the Seventh issue of Cemig Distribuição.
[4] Cemig Geração e Transmissão;
[5] Advance of funds to achieve the yield to maturity agreed in the Eurobonds contract;