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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, 2017 BRL (R$)
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Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | R$ 25,750
Floating rates [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 23,407
Floating rates [member] | Loans, financings and debentures [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 21,522
Floating rates [member] | Tax Anmesty Program (PRCT) [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 287
Floating rates [member] | Onerous concessions [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 27
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 | 1,002
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 | 569
Fixed rate [member] | Suppliers [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2,343
Up to 1 month [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2,494
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 | 151
Up to 1 month [Member] | Floating rates [member] | Loans, financings and debentures [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 43
Up to 1 month [Member] | Floating rates [member] | Tax Anmesty Program (PRCT) [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 94
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 | 11
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 | 3
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 | 2,343
1 to 3 months [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 1,225
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 | 1,225
1 to 3 months [Member] | Floating rates [member] | Loans, financings and debentures [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] | Tax Anmesty Program (PRCT) [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 193
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 | 22
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 | 5
3 months to 1 year [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2,358
3 months to 1 year [Member] | Floating rates [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2,358
3 months to 1 year [Member] | Floating rates [member] | Loans, financings and debentures [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2,231
3 months to 1 year [Member] | Floating rates [member] | Onerous concessions [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 2
3 months to 1 year [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 | 102
3 months to 1 year [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 | 23
1 to 5 years [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 12,510
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 | 12,510
1 to 5 years [Member] | Floating rates [member] | Loans, financings and debentures [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 11,755
1 to 5 years [Member] | Floating rates [member] | Onerous concessions [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 10
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 | 607
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 | 138
Over 5 years [Member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 7,163
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 | 7,163
Over 5 years [Member] | Floating rates [member] | Loans, financings and debentures [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 6,488
Over 5 years [Member] | Floating rates [member] | Onerous concessions [member] |
Disclosure of financial instruments by type of interest rate [line items] |
Financial assets held for managing liquidity risk | 15
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 | 260
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$ 400

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