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Financial Instruments and Risk Management - Summary of Flow of Payments of the Company's Obligations for Debt Agreed, Financings and Debentures for Floating and Fixed Rates Including the Interest Specified in Contracts (Detail)
R$ in Millions
Dec. 31, 2018
BRL (R$)
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 24,463
Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 22,662
Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 21,071
Floating rates [member] | Onerous concession [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 24
Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 854
Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 713
Fixed rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,801
Up to 1 month [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,786
Up to 1 month [member] | Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 127
Up to 1 month [member] | Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 111
Up to 1 month [member] | Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 12
Up to 1 month [member] | Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 4
Up to 1 month [member] | Fixed rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,659
1 to 3 months [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,146
1 to 3 months [member] | Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1,005
1 to 3 months [member] | Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 975
1 to 3 months [member] | Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 23
1 to 3 months [member] | Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 7
1 to 3 months [member] | Fixed rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 141
More than 91 up to 360 days past due [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,243
More than 91 up to 360 days past due [member] | Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,242
More than 91 up to 360 days past due [member] | Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2,101
More than 91 up to 360 days past due [member] | Floating rates [member] | Onerous concession [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 2
More than 91 up to 360 days past due [member] | Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 106
More than 91 up to 360 days past due [member] | Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 33
More than 91 up to 360 days past due [member] | Fixed rate [member] | Suppliers [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 1
1 to 5 years [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 10,907
1 to 5 years [member] | Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 10,907
1 to 5 years [member] | Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 10,081
1 to 5 years [member] | Floating rates [member] | Onerous concession [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 8
1 to 5 years [member] | Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 626
1 to 5 years [member] | Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 192
Over 5 years [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 8,381
Over 5 years [member] | Floating rates [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 8,381
Over 5 years [member] | Floating rates [member] | Loans, financing and debentures [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 7,803
Over 5 years [member] | Floating rates [member] | Onerous concession [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 14
Over 5 years [member] | Floating rates [member] | Debt agreed with pension plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk 87
Over 5 years [member] | Floating rates [member] | Solution plan for deficit of the pensio plan (Forluz) [member]  
Disclosure of financial instruments by type of interest rate [line items]  
Financial assets held for managing liquidity risk R$ 477