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24. Equity (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 0.5026
Companhia Brasileira de Liquidacao e Custodia    
SummaryOfEquityLineItems [Line Items]    
Number of shares [1] 212,612,143 201,026,895
Percentage of shares [1] .3110 0.2941
The Bank of New York ADR Department    
SummaryOfEquityLineItems [Line Items]    
Number of shares [1],[2] 125,278,967 136,790,413
Percentage of shares [1],[2] .1833 0.2001
Other    
SummaryOfEquityLineItems [Line Items]    
Number of shares 2,094,474 2,168,276
Percentage of shares .0031 0.0032
[1] Each ADR corresponds to 1 share.
[2] Custodians