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Note 27 - Financial Instruments and Risks - Notional and Fair Value Amounts per Instrument and Maturity (Details)
R$ in Millions
Dec. 31, 2017
BRL (R$)
Statement Line Items [Line Items]  
Notional value R$ 12,438.3
Fair value of hedging instruments 167.7
Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 11,966.7
Fair value of hedging instruments 134.9
Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value 99.7
Fair value of hedging instruments 4.6
Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value 15.0
Fair value of hedging instruments
Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value 110.0
Fair value of hedging instruments 25.0
Later than five years [member]  
Statement Line Items [Line Items]  
Notional value 246.9
Fair value of hedging instruments 3.2
Total cost exposure [member]  
Statement Line Items [Line Items]  
Notional value 9,318.9
Fair value of hedging instruments 93.6
Total cost exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 9,219.2
Fair value of hedging instruments 89.0
Total cost exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value 99.7
Fair value of hedging instruments 4.6
Total cost exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total cost exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total cost exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Commodity risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Notional value 1,955.3
Fair value of hedging instruments 95.8
Commodity risk portion of cost exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 1,859.2
Fair value of hedging instruments 91.1
Commodity risk portion of cost exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value 96.1
Fair value of hedging instruments 4.7
Commodity risk portion of cost exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Commodity risk portion of cost exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Commodity risk portion of cost exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American dollar risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Notional value 6,879.1
Fair value of hedging instruments (7.1)
American dollar risk portion of cost exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 6,879.1
Fair value of hedging instruments (7.1)
American dollar risk portion of cost exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American dollar risk portion of cost exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American dollar risk portion of cost exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American dollar risk portion of cost exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Notional value 82.9
Fair value of hedging instruments 2.8
Euro risk portion of cost exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 82.9
Fair value of hedging instruments 2.8
Euro risk portion of cost exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of cost exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of cost exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of cost exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Mexican Pesos risk portion of cost exposure [member]  
Statement Line Items [Line Items]  
Notional value 401.6
Fair value of hedging instruments 2.1
Mexican Pesos risk portion of cost exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 398.0
Fair value of hedging instruments 2.2
Mexican Pesos risk portion of cost exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value 3.6
Fair value of hedging instruments (0.1)
Mexican Pesos risk portion of cost exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Mexican Pesos risk portion of cost exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Mexican Pesos risk portion of cost exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total fixed asset exposure [member]  
Statement Line Items [Line Items]  
Notional value 579.5
Fair value of hedging instruments (8.9)
Total fixed asset exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 579.5
Fair value of hedging instruments (8.9)
Total fixed asset exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total fixed asset exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total fixed asset exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total fixed asset exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of fixed assets exposure [member]  
Statement Line Items [Line Items]  
Notional value 531.9
Fair value of hedging instruments (9.0)
American Dollar risk portion of fixed assets exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 531.9
Fair value of hedging instruments (9.0)
American Dollar risk portion of fixed assets exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of fixed assets exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of fixed assets exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of fixed assets exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of fixed assets exposure [member]  
Statement Line Items [Line Items]  
Notional value 47.6
Fair value of hedging instruments 0.1
Euro risk portion of fixed assets exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 47.6
Fair value of hedging instruments 0.1
Euro risk portion of fixed assets exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of fixed assets exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of fixed assets exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Euro risk portion of fixed assets exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total expenses exposure [member]  
Statement Line Items [Line Items]  
Notional value 177.7
Fair value of hedging instruments (1.3)
Total expenses exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 177.7
Fair value of hedging instruments (1.3)
Total expenses exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total expenses exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total expenses exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total expenses exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the expenses exposure [member]  
Statement Line Items [Line Items]  
Notional value 169.2
Fair value of hedging instruments (1.3)
American Dollar risk portion of the expenses exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 169.2
Fair value of hedging instruments (1.3)
American Dollar risk portion of the expenses exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the expenses exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the expenses exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the expenses exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member]  
Statement Line Items [Line Items]  
Notional value 8.5
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 8.5
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Rupee risk portion of the expenses exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total cash exposure [member]  
Statement Line Items [Line Items]  
Notional value 1,328.3
Fair value of hedging instruments (13.1)
Total cash exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 1,313.3
Fair value of hedging instruments (13.1)
Total cash exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total cash exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value 15.0
Fair value of hedging instruments
Total cash exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total cash exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the cash exposure [member]  
Statement Line Items [Line Items]  
Notional value 1,313.3
Fair value of hedging instruments (13.1)
American Dollar risk portion of the cash exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 1,313.3
Fair value of hedging instruments (13.1)
American Dollar risk portion of the cash exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the cash exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the cash exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
American Dollar risk portion of the cash exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member]  
Statement Line Items [Line Items]  
Notional value 15.0
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value 15.0
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the cash exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total debts exposure [member]  
Statement Line Items [Line Items]  
Notional value 356.9
Fair value of hedging instruments 28.2
Total debts exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total debts exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total debts exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Total debts exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value 110.0
Fair value of hedging instruments 25.0
Total debts exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value 246.9
Fair value of hedging instruments 3.2
Interest rate risk portion of the debts exposure [member]  
Statement Line Items [Line Items]  
Notional value 356.9
Fair value of hedging instruments 28.2
Interest rate risk portion of the debts exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the debts exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the debts exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Fair value of hedging instruments
Interest rate risk portion of the debts exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value 110.0
Fair value of hedging instruments 25.0
Interest rate risk portion of the debts exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value 246.9
Fair value of hedging instruments 3.2
Total foreign investments exposure [member]  
Statement Line Items [Line Items]  
Notional value 677.0
Total foreign investments exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 677.0
Total foreign investments exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
Total foreign investments exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
Total foreign investments exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
Total foreign investments exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Total equity exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 69.2
Total equity exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 69.2
Total equity exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Total equity exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Total equity exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Total equity exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
American Dollar risk portion of the foreign investments exposure [member]  
Statement Line Items [Line Items]  
Notional value 677.0
American Dollar risk portion of the foreign investments exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Notional value 677.0
American Dollar risk portion of the foreign investments exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Notional value
American Dollar risk portion of the foreign investments exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Notional value
American Dollar risk portion of the foreign investments exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Notional value
American Dollar risk portion of the foreign investments exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Notional value
Stock exchange price risk portion of the equity instrument exposure [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 69.2
Stock exchange price risk portion of the equity instrument exposure [member] | Not later than one year [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments 69.2
Stock exchange price risk portion of the equity instrument exposure [member] | Later than one year and not later than two years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Stock exchange price risk portion of the equity instrument exposure [member] | Later than two years and not later than three years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Stock exchange price risk portion of the equity instrument exposure [member] | Later than three years and not later than four years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments
Stock exchange price risk portion of the equity instrument exposure [member] | Later than five years [member]  
Statement Line Items [Line Items]  
Fair value of hedging instruments