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22. Equity (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SummaryOfEquityLineItems [Line Items]    
Number of shares 683,509,869 683,509,869
Percentage of shares 1.0000 1.0000
State Department of Finance    
SummaryOfEquityLineItems [Line Items]    
Number of shares 343,524,285 343,524,285
Percentage of shares .5026 .5026
Companhia Brasileira de Liquidacao e Custodia    
SummaryOfEquityLineItems [Line Items]    
Number of shares [1] 201,026,895 206,955,305
Percentage of shares .2941 .3028
The Bank of New York ADR Department    
SummaryOfEquityLineItems [Line Items]    
Number of shares [1],[2] 136,790,413 132,401,813
Percentage of shares .2001 .1937
Other    
SummaryOfEquityLineItems [Line Items]    
Number of shares 2,168,276 628,466
Percentage of shares .0032 .0009
[1] custodians
[2] Each ADR corresponds to 1 share.