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Financial instruments (Details 29) - Number | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 1,527,117 | 2,218,625
Up to 1 month [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 69,459 | 66,149
31 to 60 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 26,104 | 118,393
61 to 90 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 203,550 | 84,093
91 to 180 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 154,067 | 816,613
181 to 365 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 279,579 | 269,839
1 to 2 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 273,024 | 167,063
2 to 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 445,285 | 604,029
More than 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 76,049 | 92,446
Foreign Exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 365,555 | 469,822
Foreign Exchange risk [member] | Up to 1 month [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 69,459 | 66,149
Foreign Exchange risk [member] | 31 to 60 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 26,104 | 33,393
Foreign Exchange risk [member] | 61 to 90 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 1,729 | 24,093
Foreign Exchange risk [member] | 91 to 180 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 16,567 | 71,533
Foreign Exchange risk [member] | 181 to 365 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 68,952 | 109,228
Foreign Exchange risk [member] | 1 to 2 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 178,331 | 92,115
Foreign Exchange risk [member] | 2 to 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 4,413 | 73,311
Foreign Exchange risk [member] | More than 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 0
Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 962,500 | 1,548,202
Interest Rate Risk [Member] | Up to 1 month [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 0
Interest Rate Risk [Member] | 31 to 60 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 85,000
Interest Rate Risk [Member] | 61 to 90 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 185,000 | 60,000
Interest Rate Risk [Member] | 91 to 180 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 137,500 | 745,080
Interest Rate Risk [Member] | 181 to 365 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 202,500 | 160,422
Interest Rate Risk [Member] | 1 to 2 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 21,500 | 50,000
Interest Rate Risk [Member] | 2 to 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 416,000 | 434,500
Interest Rate Risk [Member] | More than 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 13,200
Foreign exchange and interest rate risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 199,062 | 200,601
Foreign exchange and interest rate risk [Member] | Up to 1 month [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 0
Foreign exchange and interest rate risk [Member] | 31 to 60 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 0
Foreign exchange and interest rate risk [Member] | 61 to 90 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 16,821 | 0
Foreign exchange and interest rate risk [Member] | 91 to 180 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 0 | 0
Foreign exchange and interest rate risk [Member] | 181 to 365 days [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 8,127 | 189
Foreign exchange and interest rate risk [Member] | 1 to 2 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 73,193 | 24,948
Foreign exchange and interest rate risk [Member] | 2 to 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 24,872 | 96,218
Foreign exchange and interest rate risk [Member] | More than 5 years [member] |  |
Disclosure of financial instruments [Line Items] |  |
Nominal amount of hedging instrument | 76,049 | 79,246

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