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4. Cash and Cash Equivalents and Financial Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents And Financial Investments Tables  
Cash and cash equivalents
    2017   2016
         
Cash and bank deposits        
In local currency   73,128   47,177
In foreign currency   74,798   66,141
         
Financial investments considered cash equivalents        
In local currency        
Fixed-income securities   4,821,605   3,837,807
In foreign currency        
Fixed-income securities   32,473   323,033
         
Total cash and cash equivalents   5,002,004   4,274,158
Financial investments
    2017   2016
         
Financial investments        
In local currency        
Fixed-income securities and funds   1,153,040   1,174,458
         
In foreign currency        
Fixed-income securities and funds   129,131   34,775
         
Currency and interest rate hedging instruments (a)   85,753   218,458
         
Total financial investments   1,367,924   1,427,691
         
Current   1,283,498   1,412,587
Non-current   84,426   15,104