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Related Party Transactions - Summary of Cemig's Principal Balances and Transactions With Related Parties (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of transactions between related parties [line items] |  |  |
Current assets | R$ 8,537 | R$ 8,286 |
Non-current assets | 33,703 | 33,750 |
Current liabilities | 8,663 | 11,447 |
Non-current liabilities | 19,247 | 17,655 |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 235 |  |
Revenue | 42 |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] | Consumers and traders [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 55 | 71 |
Revenue | 136 | 152 | R$ 150
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] | Public Lighting Contribution [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 1 |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Non current [member] | Consumers and traders [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets | 50 |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Non current [member] | Public Lighting Contribution [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets | 1 |  |
Entities with joint control or significant influence over entity [member] | Alianca Geracao [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 7 | 7 |
Expenses | (147) | (142) | (106)
Entities with joint control or significant influence over entity [member] | Alianca Geracao [member] | Current [member] | Provision of services [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 2 | 4 |
Revenue | 13 | 14 | 6
Entities with joint control or significant influence over entity [member] | Alianca Geracao [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 72 |  |
Entities with joint control or significant influence over entity [member] | Baguari Energia [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 1 | 1 |
Expenses | (7) | (7) | (6)
Entities with joint control or significant influence over entity [member] | Baguari Energia [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets |  | 6 |
Entities with joint control or significant influence over entity [member] | Baguari Energia [member] | Current [member] | Services [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue | 1 | 1 |
Entities with joint control or significant influence over entity [member] | Madeira Energia [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 57 | 18 |
Revenue | 27 | 8 |
Expenses | (686) | (574) | (638)
Entities with joint control or significant influence over entity [member] | Madeira Energia [member] | Current [member] | Advance against future electricity supply [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 66 |  |
Revenue |  |  | 12
Entities with joint control or significant influence over entity [member] | Madeira Energia [member] | Non current [member] | Advance for future power supply [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets | 7 |  |
Entities with joint control or significant influence over entity [member] | Norte Energia [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 4 | 4 |
Revenue | 9 | 2 |
Expenses | (122) | (49) |
Entities with joint control or significant influence over entity [member] | Lightger [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Expenses | (19) | (19) | (17)
Entities with joint control or significant influence over entity [member] | Hidreletrica Pipoca [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities |  | 1 |
Expenses | (15) | (16) | (11)
Entities with joint control or significant influence over entity [member] | Hidreletrica Pipoca [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 1 |  |
Entities with joint control or significant influence over entity [member] | Retiro Baixo [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets |  | 1 |
Current liabilities | 1 |  |
Expenses | (6) | (6) | (3)
Entities with joint control or significant influence over entity [member] | Retiro Baixo [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 3 | 2 |
Entities with joint control or significant influence over entity [member] | Guanhaes energia [member] | Current [member] | Adjustment for losses [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities |  | 59 |
Entities with joint control or significant influence over entity [member] | Renova [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 2 |  |
Expenses | (179) | (159) | (12)
Entities with joint control or significant influence over entity [member] | Renova [member] | Non current [member] | Accounts Receivable [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets | 350 | 74 |
Revenue |  | 14 |
Entities with joint control or significant influence over entity [member] | Renova [member] | Non current [member] | Advance for future delivery of power supply [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets |  | 229 |
Revenue |  | 17 |
Entities with joint control or significant influence over entity [member] | Empresa Amazonense de Transmissao de Energia EATE [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 3 | 3 |
Expenses | (26) | (25) | (28)
Entities with joint control or significant influence over entity [member] | Light [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 1 |  |
Revenue | 54 | 59 | 47
Expenses | (1) | (1) | (1)
Entities with joint control or significant influence over entity [member] | Light [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets |  | 7 |
Entities with joint control or significant influence over entity [member] | Taesa [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 12 | 10 |
Expenses | (127) | (110) | (94)
Entities with joint control or significant influence over entity [member] | Taesa [member] | Current [member] | Services [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue | 1 | 1 |
Entities with joint control or significant influence over entity [member] | Cia. Transirape de Transmissao [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 1 | 1 |
Expenses | (10) | (9) | (7)
Entities with joint control or significant influence over entity [member] | Cia. Transirape de Transmissao [member] | Current [member] | Provision of services [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue | 1 | 1 | 1
Entities with joint control or significant influence over entity [member] | Cia. Transirape de Transmissao [member] | Current [member] | Interest on Equity, and dividends [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 1 | 1 |
Entities with joint control or significant influence over entity [member] | Axxiom [member] | Current [member] | Provision of services [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 3 | 7 |
Entities with joint control or significant influence over entity [member] | Transudeste [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Expenses | (2) | (1) | (1)
Entities with joint control or significant influence over entity [member] | Transudeste [member] | Current [member] | Provision of services [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue | 1 | 1 | 1
Entities with joint control or significant influence over entity [member] | Transleste [member] | Current [member] | Transactions in electricity [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Expenses | (3) | (2) | (2)
Other related parties [member] | FIC Pampulha [member] | Current [member] | Cash and cash equivalents [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 322 | 428 |
Other related parties [member] | FIC Pampulha [member] | Current [member] | Securities [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | 1,037 | 1,027 |
Revenue | 9 | 197 | 115
Other related parties [member] | FIC Pampulha [member] | Current [member] | Securities issued by subsidiary companies of Cemig [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current assets | (25) | (49) |
Other related parties [member] | FIC Pampulha [member] | Non current [member] | Securities [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets | 30 | 46 |
Other related parties [member] | FIC Pampulha [member] | Non current [member] | Securities issued by subsidiary companies of Cemig [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current assets |  | (15) |
Other related parties [member] | FORLUZ [member] | Current [member] | Post-retirement obligations [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 109 | 86 |
Expenses | (174) | (186) | (129)
Other related parties [member] | FORLUZ [member] | Current [member] | Supplementary pension contributions [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Expenses | (84) | (100) | (85)
Other related parties [member] | FORLUZ [member] | Current [member] | Administrative running costs [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Expenses | (26) | (25) | (22)
Other related parties [member] | FORLUZ [member] | Current [member] | Operating leases [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 5 | 10 |
Expenses | (55) | (39) | (18)
Other related parties [member] | FORLUZ [member] | Non current [member] | Post-retirement obligations [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current liabilities | 1,960 | 1,593 |
Other related parties [member] | CEMIG SAUDE [member] | Current [member] | Health and dental plans [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Current liabilities | 115 | 102 |
Expenses | (193) | (187) | R$ (146)
Other related parties [member] | CEMIG SAUDE [member] | Non current [member] | Health and dental plans [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Non-current liabilities | R$ 1,633 | R$ 1,647 |

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