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5. OPERATING SEGMENTS (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Apr. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]        
SEGMENT ASSETS   R$ 54,083 R$ 50,527 R$ 60,339
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES   5,415 5,399 5,235
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE   1,258 1,258  
ADDITIONS TO THE SEGMENT   1,918 2,201 1,632
NET REVENUE   25,228 25,487 [1] 22,266
COST OF ENERGY AND GAS        
Energy bought for resale   (12,111) (11,286) [1] (11,084)
Charges for use of the national grid   (1,748) (1,426) [1] (1,480)
Gas bought for resale   (1,083) (1,436) (1,238)
Operating costs, total   (14,942) (14,148) (13,802)
OPERATING COSTS AND EXPENSES        
Personnel   (1,276) (1,272) (1,410)
Employees' and managers' profit sharing   (142) (263) (77)
Post-employment obligations   (438) (408) (337)
Materials   (79) (91) (104)
Raw materials and inputs for production of energy      
Outsourced services   (1,265) (1,239) (1,087)
Depreciation and amortization   (989) (958) (835)
Operating provisions (reversals)   (423) (2,401) (466)
Construction costs   (1,581) (1,200) (897)
Other operating expenses, net   (297) (495) (405)
Total cost of operation   (6,490) (8,327) (5,618)
OPERATING COSTS AND EXPENSES   (21,432) (22,475) (19,420)
Equity in earnings of unconsolidated investees, net   357 125 [1] (104)
Dividends declared by investee classified as held for sale     73  
Gain on a bargain purchase and remeasurement of previously held equity interest in subsidiary acquired in business combinations transactions   51    
Remeasurement of previously held equity interest in subsidiaries acquired     (119)
Impairment for investments     (127)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   4,706 3,210 [1] 2,529
Finance income   2,445 3,207 [1] 1,706
Finance expenses   (3,350) (1,847) [1] (2,224)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   3,801 4,469 [1] 2,011
Income tax and social contribution tax   (936) (1,599) (610)
Net income for the year from continuing operations   2,865 2,969 [1] 1,401 [1]
DISCONTINUED OPERATIONS        
NET INCOME AFTER TAX FROM DISCONTINUED OPERATIONS   224 [1] 363 [1]
Items that may be reclassified to profit or loss        
Equity gain (loss) on Other comprehensive income in subsidiary and jointly-controlled entity, net of tax    
NET INCOME (LOSS) FOR THE YEAR     3,193
NET INCOME FOR THE YEAR R$ 2,864 2,865 3,194 [1] 1,764 [1]
Equity holders of the parent   2,864 3,193 1,722
Non-controlling interests   1 1 [1] 42
Operating Segments [member] | Elimination Segments [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   (663) (1,127)  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES    
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE      
ADDITIONS TO THE SEGMENT      
NET REVENUE   (333) (307)  
COST OF ENERGY AND GAS        
Energy bought for resale   76 72  
Charges for use of the national grid   223  
Gas bought for resale      
Operating costs, total   326 295  
OPERATING COSTS AND EXPENSES        
Personnel      
Employees' and managers' profit sharing      
Post-employment obligations      
Materials      
Outsourced services   7 7  
Depreciation and amortization      
Operating provisions (reversals)      
Construction costs      
Other operating expenses, net   5  
Total cost of operation   8 12  
OPERATING COSTS AND EXPENSES   333 (307)  
Equity in earnings of unconsolidated investees, net      
Operating Segments [member] | Restated [member] | Elimination Segments [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       (957)
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES      
NET REVENUE       (293)
COST OF ENERGY AND GAS        
Energy bought for resale       71
Charges for use of the national grid       199
Operating costs, total       270
OPERATING COSTS AND EXPENSES        
Outsourced services       15
Other operating expenses, net       8
Total cost of operation       23
OPERATING COSTS AND EXPENSES       293
Operating Segments [member] | Other Segments [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   3,712 3,888  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES   21 29  
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE    
ADDITIONS TO THE SEGMENT   9  
NET REVENUE   105 324  
COST OF ENERGY AND GAS        
Energy bought for resale      
Charges for use of the national grid      
Gas bought for resale      
Operating costs, total      
OPERATING COSTS AND EXPENSES        
Personnel   (24) (35)  
Employees' and managers' profit sharing   (14) (17)  
Post-employment obligations   (47) (43)  
Materials     (3)  
Raw materials and inputs for production of energy   (33)    
Outsourced services   (3) (40)  
Depreciation and amortization   (18) (4)  
Operating provisions (reversals)     (188)  
Construction costs      
Other operating expenses, net   (16)    
Total cost of operation   (155) (330)  
OPERATING COSTS AND EXPENSES   (155) (330)  
Equity in earnings of unconsolidated investees, net   (8) (2)  
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   (58) (8)  
Finance income     269  
Finance expenses   (4) (19)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   (62) 242  
Income tax and social contribution tax   (6) (124)  
Net income for the year from continuing operations   (68) 118  
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR     118  
NET INCOME FOR THE YEAR   (68) 118  
Equity holders of the parent   (68) 118  
Operating Segments [member] | Other Segments [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       2,607
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES       17
NET REVENUE       134
OPERATING COSTS AND EXPENSES        
Personnel       (29)
Employees' and managers' profit sharing       (9)
Post-employment obligations       (40)
Outsourced services       (30)
Depreciation and amortization       (1)
Operating provisions (reversals)       (18)
Other operating expenses, net       (112)
Total cost of operation       (239)
OPERATING COSTS AND EXPENSES       (239)
Equity in earnings of unconsolidated investees, net       (14)
Remeasurement of previously held equity interest in subsidiaries acquired       (147)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)       (266)
Finance income       13
Finance expenses       (19)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX       (272)
Income tax and social contribution tax       57
Net income for the year from continuing operations       (215)
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR       (115)
NET INCOME FOR THE YEAR       (215)
Equity holders of the parent       (217)
Non-controlling interests       2
Operating Segments [member] | Gas Segment [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   2,615 2,689  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES    
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE      
ADDITIONS TO THE SEGMENT   50 934  
NET REVENUE   1,664 1,858  
COST OF ENERGY AND GAS        
Energy bought for resale    
Charges for use of the national grid    
Gas bought for resale   (1,083) (1,436)  
Operating costs, total   (1,083) (1,436)  
OPERATING COSTS AND EXPENSES        
Personnel   (60) (46)  
Employees' and managers' profit sharing    
Post-employment obligations    
Materials   (1) (20)  
Outsourced services   (25) (2)  
Depreciation and amortization   (106) (86)  
Operating provisions (reversals)   (1) (2)  
Construction costs   (50) (43)  
Other operating expenses, net   (12) (10)  
Total cost of operation   (255) (209)  
OPERATING COSTS AND EXPENSES   (1,338) (1,645)  
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES)     213  
Equity in earnings of unconsolidated investees, net    
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   326    
Finance income   44 21  
Finance expenses   (58) (46)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   312 188  
Income tax and social contribution tax   (58) (48)  
Net income for the year from continuing operations   227 140  
Items that may be reclassified to profit or loss        
Equity gain (loss) on Other comprehensive income in subsidiary and jointly-controlled entity, net of tax     139  
NET INCOME FOR THE YEAR   227 140  
Equity holders of the parent   226 139  
Non-controlling interests     1  
Operating Segments [member] | Gas Segment [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       1,822
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES      
ADDITIONS TO THE SEGMENT       70
NET REVENUE       1,619
COST OF ENERGY AND GAS        
Gas bought for resale       (1,238)
Operating costs, total       (1,238)
OPERATING COSTS AND EXPENSES        
Personnel       (60)
Materials       (2)
Outsourced services       (20)
Depreciation and amortization       (74)
Operating provisions (reversals)       2
Construction costs       (44)
Other operating expenses, net       (13)
Total cost of operation       (211)
OPERATING COSTS AND EXPENSES       (1,449)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)       170
Finance income       84
Finance expenses       (38)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX       216
Income tax and social contribution tax       (53)
Net income for the year from continuing operations       163
Items that may be reclassified to profit or loss        
NET INCOME FOR THE YEAR       163
Equity holders of the parent       162
Non-controlling interests       1
Operating Segments [member] | Energy Distribution Segment [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   26,399 25,616  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES    
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE   1,258 1,258  
ADDITIONS TO THE SEGMENT   1,384 936  
NET REVENUE   16,512 15,919  
COST OF ENERGY AND GAS        
Energy bought for resale   (8,161) (7,517)  
Charges for use of the national grid   (1,799) (1,459)  
Gas bought for resale      
Operating costs, total   (9,960) (8,976)  
OPERATING COSTS AND EXPENSES        
Personnel   (886) (869)  
Employees' and managers' profit sharing   (92) (183)  
Post-employment obligations   (297) (277)  
Materials   (61) (63)  
Outsourced services   (1,055) (1,016)  
Depreciation and amortization   (668) (652)  
Operating provisions (reversals)   (272) (1,101)  
Construction costs   (1,384) (937)  
Other operating expenses, net   (212) (299)  
Total cost of operation   (4,927) (5,397)  
OPERATING COSTS AND EXPENSES   (14,887) (14,373)  
Equity in earnings of unconsolidated investees, net      
Dividends declared by investee classified as held for sale     73  
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   1,625 1,619  
Finance income   514 1,535  
Finance expenses   (505) (632)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   1,634 2,522  
Income tax and social contribution tax   (430) (806)  
Net income for the year from continuing operations   1,204 1,716  
DISCONTINUED OPERATIONS        
NET INCOME AFTER TAX FROM DISCONTINUED OPERATIONS     224  
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR     1,940  
NET INCOME FOR THE YEAR   1,204 1,940  
Equity holders of the parent   1,204 1,940  
Operating Segments [member] | Energy Distribution Segment [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       37,840
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES      
ADDITIONS TO THE SEGMENT       856
NET REVENUE       13,757
COST OF ENERGY AND GAS        
Energy bought for resale       (7,238)
Charges for use of the national grid       (1,463)
Operating costs, total       (8,701)
OPERATING COSTS AND EXPENSES        
Personnel       (965)
Employees' and managers' profit sharing       (51)
Post-employment obligations       (224)
Materials       (58)
Outsourced services       (880)
Depreciation and amortization       (595)
Operating provisions (reversals)       (332)
Construction costs       (757)
Other operating expenses, net       (203)
Total cost of operation       (4,065)
OPERATING COSTS AND EXPENSES       (12,766)
Equity in earnings of unconsolidated investees, net       33
Remeasurement of previously held equity interest in subsidiaries acquired       (52)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)       972
Finance income       434
Finance expenses       (621)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX       785
Income tax and social contribution tax       (217)
Net income for the year from continuing operations       568
DISCONTINUED OPERATIONS        
NET INCOME AFTER TAX FROM DISCONTINUED OPERATIONS       62
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR       630
NET INCOME FOR THE YEAR       630
Equity holders of the parent       599
Non-controlling interests       31
Operating Segments [member] | Energy Generation Segment [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   16,150 14,749  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES   3,927 4,133  
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE      
ADDITIONS TO THE SEGMENT   238 102  
NET REVENUE   6,537 6,882  
COST OF ENERGY AND GAS        
Energy bought for resale   (4,026) (3,841)  
Charges for use of the national grid   (199) (190)  
Gas bought for resale      
Operating costs, total   (4,225) (4,031)  
OPERATING COSTS AND EXPENSES        
Personnel   (192) (207)  
Employees' and managers' profit sharing   (24) (36)  
Post-employment obligations   (53) (50)  
Materials   (13) (17)  
Outsourced services   (113) (125)  
Depreciation and amortization   (207) (210)  
Operating provisions (reversals)   (122) (975)  
Construction costs      
Other operating expenses, net   (68) (175)  
Total cost of operation   (792) (1,795)  
OPERATING COSTS AND EXPENSES   (5,017) (5,826)  
OPERATING INCOME BEFORE EQUITY GAINS (LOSSES) AND FINANCE INCOME (EXPENSES)   (129)    
Equity in earnings of unconsolidated investees, net     (88)  
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   1,391 968  
Finance income   1,711 1,282  
Finance expenses   (2,509) (1,035)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   593 1,215  
Income tax and social contribution tax   (206) (551)  
Net income for the year from continuing operations   387 664  
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR     664  
NET INCOME FOR THE YEAR   387 664  
Equity holders of the parent   387 664  
Operating Segments [member] | Energy Generation Segment [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       14,671
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES       4,055
ADDITIONS TO THE SEGMENT       559
NET REVENUE       6,374
COST OF ENERGY AND GAS        
Energy bought for resale       (3,917)
Charges for use of the national grid       (216)
Operating costs, total       (4,133)
OPERATING COSTS AND EXPENSES        
Personnel       (230)
Employees' and managers' profit sharing       (10)
Post-employment obligations       (46)
Materials       (39)
Outsourced services       (123)
Depreciation and amortization       (164)
Operating provisions (reversals)       (107)
Other operating expenses, net       (65)
Total cost of operation       (784)
OPERATING COSTS AND EXPENSES       (4,917)
Equity in earnings of unconsolidated investees, net       (353)
Remeasurement of previously held equity interest in subsidiaries acquired       80
Impairment for investments       (127)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)       1,057
Finance income       1,113
Finance expenses       (1,536)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX       634
Income tax and social contribution tax       (276)
Net income for the year from continuing operations       358
DISCONTINUED OPERATIONS        
NET INCOME AFTER TAX FROM DISCONTINUED OPERATIONS       11
Items that may be reclassified to profit or loss        
NET INCOME FOR THE YEAR       369
Equity holders of the parent       361
Non-controlling interests       8
Operating Segments [member] | Telecommunications segment [member]        
Disclosure of operating segments [line items]        
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES      
Operating Segments [member] | Telecommunications segment [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       10
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES      
ADDITIONS TO THE SEGMENT [2]       9
OPERATING COSTS AND EXPENSES        
Personnel [2]       (18)
Materials [2]       (1)
Outsourced services [2]       (9)
Depreciation and amortization [2]       (1)
Operating provisions (reversals) [2]       1
Other operating expenses, net [2]       (3)
Total cost of operation [2]       (31)
OPERATING COSTS AND EXPENSES       (31)
Equity in earnings of unconsolidated investees, net [2]       (1)
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) [2]       (32)
Finance income [2]       1
Finance expenses [2]       (5)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX [2]       (36)
Income tax and social contribution tax [2]       12
Net income for the year from continuing operations [2]       (24)
DISCONTINUED OPERATIONS        
NET INCOME AFTER TAX FROM DISCONTINUED OPERATIONS [2]       290
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR       266
NET INCOME FOR THE YEAR [2]       266
Equity holders of the parent [2]       266
Operating Segments [member] | Energy Transmission Segment [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS   5,870 4,712  
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES   1,467 1,237  
INVESTMENTS IN AFFILIATES CLASSIFIED AS HELD FOR SALE      
ADDITIONS TO THE SEGMENT   246 220  
NET REVENUE   743 811  
COST OF ENERGY AND GAS        
Energy bought for resale      
Charges for use of the national grid      
Gas bought for resale      
Operating costs, total      
OPERATING COSTS AND EXPENSES        
Personnel   (114) (115)  
Employees' and managers' profit sharing   (12) (27)  
Post-employment obligations   (41) (38)  
Materials   (4) (6)  
Outsourced services   (46) (45)  
Depreciation and amortization   (5) (6)  
Operating provisions (reversals)   (10) (135)  
Construction costs   (147) (220)  
Other operating expenses, net   11 (16)  
Total cost of operation   (368) (608)  
OPERATING COSTS AND EXPENSES   (368) (608)  
Equity in earnings of unconsolidated investees, net   494 215  
Dividends declared by investee classified as held for sale   502    
Remeasurement of previously held equity interest in subsidiaries acquired   52    
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)   1,422 418  
Finance income   175 98  
Finance expenses   (274) (115)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX   1,323 401  
Income tax and social contribution tax   (209) (70)  
Net income for the year from continuing operations   1,114 331  
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR     331  
NET INCOME FOR THE YEAR   1,114 331  
Equity holders of the parent   R$ 1,114 R$ 331  
Operating Segments [member] | Energy Transmission Segment [member] | Restated [member]        
Disclosure of operating segments [line items]        
SEGMENT ASSETS       4,346
INVESTMENTS IN SUBSIDIARIES AND JOINTLY-CONTROLLED ENTITIES       1,163
ADDITIONS TO THE SEGMENT       138
NET REVENUE       708
OPERATING COSTS AND EXPENSES        
Personnel       (108)
Employees' and managers' profit sharing       (7)
Post-employment obligations       (27)
Materials       (4)
Outsourced services       (40)
Operating provisions (reversals)       (12)
Construction costs       (96)
Other operating expenses, net       (17)
Total cost of operation       (311)
OPERATING COSTS AND EXPENSES       (311)
Equity in earnings of unconsolidated investees, net       231
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)       628
Finance income       61
Finance expenses       (5)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX       684
Income tax and social contribution tax       (133)
Net income for the year from continuing operations       551
Items that may be reclassified to profit or loss        
NET INCOME (LOSS) FOR THE YEAR       551
NET INCOME FOR THE YEAR       551
Equity holders of the parent       R$ 551
[1] See note 2.8.
[2] On March 31, 2018 Cemig Telecom assets and liabilities were merged into the Company.