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Related Party Transactions - Summary of Dividends Receivable from Investees' Investments (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Dividends receivable	R$ 120	R$ 77
Alianca Geracao [member]
Disclosure of transactions between related parties [line items]
Dividends receivable	91	72
Retiro Baixo [member]
Disclosure of transactions between related parties [line items]
Dividends receivable	6	3
Hidreletrica Cachoeirao [member]
Disclosure of transactions between related parties [line items]
Dividends receivable	3
Companhia de Transmissao Centroeste de Minas [member]
Disclosure of transactions between related parties [line items]
Dividends receivable	1
Other subsidiaries [member]
Disclosure of transactions between related parties [line items]
Dividends receivable	R$ 19	R$ 2

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

Dividends Receivable from subsidiaries.

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