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Schedule of cemig's principal balances and transactions with related parties (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets 1 [Member]      
IfrsStatementLineItems [Line Items]      
Receivables from customers and traders (1) R$ 167 R$ 335  
Accounts Receivable – AFAC (2) 13 12  
Transactions with energy (4) 8 2  
Adjustment for losses (5)  
Transactions with energy (4)  
Provision of services (6) 1  
Transactions with energy (4)  
Provision of services (6)  
Transactions with energy (4) 2  
Transactions with energy (4)  
Transactions with energy (4)  
Interest on Equity, and dividends 3  
Transactions with energy (4) 1  
Interest on Equity, and dividends 7  
Transactions with energy (4)  
Provision of services (6)  
Adjustment for losses (8)  
Provision of services (9)  
Cash and cash equivalents 81 171  
Marketable securities 1,707 3,356  
Marketable securities 351 755  
Post-employment obligations (10)  
Supplementary pension contributions – Defined contribution plan (11)  
Administrative running costs (12)  
Operating leasing (13) 170 167  
Post-employment obligations (10)  
Operating leasing (13)  
Health Plan and Dental Plan (14)  
Health Plan and Dental Plan (14)  
Liabilities 1 [Member]      
IfrsStatementLineItems [Line Items]      
Receivables from customers and traders (1)  
Accounts Receivable – AFAC (2)  
Transactions with energy (4) 13 92  
Adjustment for losses (5) 162  
Transactions with energy (4) 17 14  
Provision of services (6)  
Transactions with energy (4) 1 1  
Provision of services (6)  
Transactions with energy (4) 35 25  
Transactions with energy (4) 3 2  
Transactions with energy (4) 3 3  
Interest on Equity, and dividends  
Transactions with energy (4) 1  
Interest on Equity, and dividends  
Transactions with energy (4) 10 8  
Provision of services (6)  
Adjustment for losses (8) 21 30  
Provision of services (9) 4  
Cash and cash equivalents  
Marketable securities  
Marketable securities  
Post-employment obligations (10) 181 159  
Supplementary pension contributions – Defined contribution plan (11)  
Administrative running costs (12)  
Operating leasing (13) 24 22  
Post-employment obligations (10) 2,490 2,750  
Operating leasing (13) 163 156  
Health Plan and Dental Plan (14) 184 154  
Health Plan and Dental Plan (14) 3,350 3,226  
Revenue 1 [Member]      
IfrsStatementLineItems [Line Items]      
Receivables from customers and traders (1) 107 127 R$ 166
Accounts Receivable – AFAC (2) 2 27 17
Transactions with energy (4) 95 35
Adjustment for losses (5)  
Transactions with energy (4) 53 42 40
Provision of services (6) 5 8 7
Transactions with energy (4)
Provision of services (6) 1 1 1
Transactions with energy (4) 26 28 22
Transactions with energy (4)
Transactions with energy (4)
Interest on Equity, and dividends
Transactions with energy (4) 6 5 5
Interest on Equity, and dividends
Transactions with energy (4)
Provision of services (6) 1 1 1
Adjustment for losses (8)
Provision of services (9)
Cash and cash equivalents
Marketable securities 28 33 8
Marketable securities
Post-employment obligations (10)
Supplementary pension contributions – Defined contribution plan (11)
Administrative running costs (12)
Operating leasing (13)
Post-employment obligations (10)
Operating leasing (13)
Health Plan and Dental Plan (14)  
Health Plan and Dental Plan (14)
Expenses 1 [Member]      
IfrsStatementLineItems [Line Items]      
Receivables from customers and traders (1)
Accounts Receivable – AFAC (2)
Transactions with energy (4) (1,731) (1,200)
Adjustment for losses (5) (162)  
Transactions with energy (4) (196) (174) (166)
Provision of services (6)
Transactions with energy (4) (9) (8) (8)
Provision of services (6)
Transactions with energy (4) (336) (265) (228)
Transactions with energy (4) (28) (23) (21)
Transactions with energy (4) (37) (26) (19)
Interest on Equity, and dividends
Transactions with energy (4) (5) (5) (5)
Interest on Equity, and dividends
Transactions with energy (4) (123) (100) (96)
Provision of services (6)
Adjustment for losses (8)
Provision of services (9)
Cash and cash equivalents
Marketable securities
Marketable securities
Post-employment obligations (10) (201) (206) (197)
Supplementary pension contributions – Defined contribution plan (11) (77) (77) (78)
Administrative running costs (12) (32) (30) (30)
Operating leasing (13) (29) (42) (55)
Post-employment obligations (10)
Operating leasing (13)
Health Plan and Dental Plan (14) (257) (241) (227)
Health Plan and Dental Plan (14)