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Loans, Financings and Debentures - Summary of Loans Financing and Debentures (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
May 07, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Principal maturity April 15, 2022 to April 15, 2025    
Current   R$ 2,198  
Non-current   12,574 R$ 12,027
Total R$ 617,950    
Total   14,772 14,398
Debt in Foreign Currency [member]      
Disclosure of detailed information about borrowings [line items]      
Current   46  
2017 Non-current   5,781  
Total   5,827 3,298
Debt in Brazilian currency [member]      
Disclosure of detailed information about borrowings [line items]      
Current   495  
2017 Non-current   1,271  
Total   1,766 2,071
Loans and Financings [member]      
Disclosure of detailed information about borrowings [line items]      
Current   541  
2017 Non-current   7,052  
Total   7,593 5,369
Interest paid in advance [member]      
Disclosure of detailed information about borrowings [line items]      
2017 Non-current   (34)  
Total   (34) (48)
Transaction costs [member]      
Disclosure of detailed information about borrowings [line items]      
2017 Non-current   (21)  
Total   R$ (21) (15)
Eurobonds [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2024  
Annual financial cost   9.25  
Currency   US$  
Current   R$ 44  
2017 Non-current   5,812  
Total   R$ 5,856 3,333
Banco do Brasil S.A. [member] | One four zero point zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   140.00% do CDI  
Currency   R$  
Total     742
Banco do Brasil S.A. [member] | One four six point five zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   146.50% do CDI  
Currency   R$  
Current   R$ 37  
2017 Non-current   466  
Total   R$ 503 500
Promissory notes ninth issue first series [member] | One five one percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2019  
Annual financial cost   151.00% do CDI  
Currency   R$  
Current   R$ 426  
Total   426  
Subsidiary Marketable Securities [member]      
Disclosure of detailed information about borrowings [line items]      
Current   (25)  
Total     (25)
Total   R$ (25)  
Debentures-3rd Issue, 2nd Series [member] | Ipca plus six point zero zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2019  
Annual financial cost   IPCA + 6.00%  
Currency   R$  
Current   R$ 156  
Total   R$ 156 301
Debentures-3rd Issue, 2nd Series [member] | Ipca plus four point seven zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2021  
Annual financial cost   IPCA + 4.70%  
Currency   R$  
Current   R$ 569  
Non-current   1,027  
Total   R$ 1,596 1,537
Debentures-3rd Issue, 3rd Series [member] | Ipca plus six point two zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   IPCA + 6.20%  
Currency   R$  
Current   R$ 53  
Non-current   996  
Total   R$ 1,049 1,011
Debentures-3rd Issue, 3rd Series [member] | Ipca plus five point one zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2025  
Annual financial cost   IPCA + 5.10%  
Currency   R$  
Current   R$ 41  
Non-current   916  
Total   R$ 957 921
Debentures-5th Issue, 1st Series [member] | Interbank rate for certificates of deposit plus one point seven zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 1.70%  
Currency   R$  
Total     703
Debentures-5th Issue, 1st Series [member] | One four six point five zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   146.50% do CDI  
Currency   R$  
Current   R$ 112  
Non-current   1,468  
Total   R$ 1,580 1,576
Debentures sixth issue first series [member] | Interbank rate for certificates of deposit plus one point six zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 1.60%  
Currency   R$  
Total     508
Debentures sixth issue first series [member] | Ipca plus eight point zero seven [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2020  
Annual financial cost   IPCA + 8.07%  
Currency   R$  
Current   R$ 17  
Non-current   16  
Total   R$ 33 32
Debentures sixth issue first series [member] | Interbank rate for certificates of deposit plus one point seven five percentage [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2020  
Annual financial cost   CDI + 1.75%  
Currency   R$  
Current   R$ 276  
Non-current   275  
Total   R$ 551  
Debentures-7th Issue, 1st Series [member] | One four zero point zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2021  
Annual financial cost   140.00% do CDI  
Currency   R$  
Current   R$ 342  
Non-current   681  
Total   R$ 1,023 1,683
Debentures-3rd Issue, 1st Series [member] | Interbank rate for certificates of deposit plus zero point six nine [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 0.69%  
Currency   R$  
Total     447
Debentures fourth issue first series [member] | Interbank rate for certificates of deposit plus four point zero five percentage one [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 4.05%  
Currency   R$  
Total     20
Debentures [member] | CDI + 1.60 [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 1.60%  
Currency   R$  
Total     100
Debentures [member] | Interbank rate for certificates of deposit plus zero point seven four [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 0.74%  
Currency   R$  
Total     34
Debentures [member] | Tjlp plus one point eight two percentage selic plus one point eight two percentage [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   TJLP+1.82% (69%) e Selic+1.82% (31%)  
Currency   R$  
Current   R$ 33  
Non-current   92  
Total   R$ 125 155
Debentures [member] | One one six point five zero percent of inter bank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2019  
Annual financial cost   116.50% do CDI  
Currency   R$  
Current   R$ 50  
Total   R$ 50 50
Debentures [member] | Interbank rate for certificates of deposit plus one point five zero percentage [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2023  
Annual financial cost   CDI + 1.50%  
Currency   R$  
Current   R$ 20  
Non-current   80  
Total   R$ 100  
Debentures second issue first series [member] | One two eight point five zero percent of inter bank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2019  
Annual financial cost   128.50% do CDI  
Currency   R$  
Total     26
Transaction costs [member]      
Disclosure of detailed information about borrowings [line items]      
Current   R$ (2)  
2017 Non-current   (11)  
Total   (13) (26)
Transaction costs [member] | Transaction costs [member]      
Disclosure of detailed information about borrowings [line items]      
Current   (12)  
Non-current   (29)  
Total   (41) (50)
Net debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Current   1,657  
Non-current   5,522  
Total   R$ 7,179 9,029
CEF [member] | TJLP plus two point five zero matured on two thousand and twenty one [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2021  
Annual financial cost   TJLP + 2.50%  
Currency   R$  
2017 Non-current   R$ 56  
Total   R$ 56  
CEF [member] | TJLP plus two point five zero matured on two thousand and twenty two [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   TJLP + 2.50%  
Currency   R$  
2017 Non-current   R$ 108  
Total   R$ 108  
CEF [member] | One four six point five zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2022  
Annual financial cost   146.50% do CDI  
Currency   R$  
Current   R$ 44  
2017 Non-current   583  
Total   R$ 627 627
CEF [member] | One One Nine Point Zero Zero Percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   119.00% do CDI  
Currency   R$  
Total     8
Eletrobras [member] | Ufir plus six point zero to eight point zero zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2023  
Annual financial cost   UFIR + 6.00% a 8.00%  
Currency   R$  
Current   R$ 13  
2017 Non-current   20  
Total   R$ 33 50
Large Consumers [member] | General domestic availability price index plus six point zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2024  
Annual financial cost   IGP-DI + 6.00%  
Currency   R$  
Current   R$ 2  
2017 Non-current   3  
Total   R$ 5 4
FINEP [member] | Tjlp plus five and tjlp plus eight point zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   TJLP+5.00% e TJLP+8.00%  
Currency   R$  
Total     2
Banco da amazonia [member] | Interbank rate for certificates of deposit plus one point nine zero [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2018  
Annual financial cost   CDI + 1.90%  
Currency   R$  
Total     122
Sonda (Cemig Telecom) [member] | One one zero percent of interbank rate for certificates of deposit [member]      
Disclosure of detailed information about borrowings [line items]      
Principal maturity   2021  
Annual financial cost   110.00% do CDI  
Currency   R$  
2017 Non-current   R$ 46  
Total   R$ 46 R$ 42