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Operating Context - Summary of Balance Sheet of Cemig Telecom Used for the Merger (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating context [line items]          
Current R$ 27,796   R$ 8,537    
Investments - Equity method 5,235   7,792    
Property, plant and equipment 2,662   2,762 R$ 3,775 R$ 3,940
Intangible assets 10,777   11,156 10,820 10,275
Non current assets 32,059   33,703    
Total assets 59,855   42,240    
LIABILITIES          
Current 23,394   8,663    
Non-current 20,522   19,247    
Equity 15,939   14,330 12,934 R$ 12,988
TOTAL LIABILITIES AND EQUITY R$ 59,855   42,240    
Cemig Telecom [member]          
Disclosure of operating context [line items]          
Current   R$ 25      
Non-current assets   15      
Investments - Equity method   17      
Property, plant and equipment   272      
Intangible assets   12      
Non current assets   316      
Total assets   341      
LIABILITIES          
Current   34      
Non-current   55      
Equity   252 R$ 247 R$ 192  
TOTAL LIABILITIES AND EQUITY   R$ 341