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Supplemental pension plans (Details 4)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assets of the Alvorada Plan    
Asset categories    
Equities 0.00% 0.00%
Fixed income 92.70% 93.10%
Real estate 5.70% 5.30%
Other 1.60% 1.60%
Total 100.00% 100.00%
Assets of the Bradesco Plan    
Asset categories    
Equities 4.70% 3.90%
Fixed income 90.60% 91.30%
Real estate 2.60% 2.70%
Other 2.10% 2.10%
Total 100.00% 100.00%
Assets of the Kirton Plan    
Asset categories    
Equities 0.00% 0.00%
Fixed income 100.00% 100.00%
Real estate 0.00% 0.00%
Other 0.00% 0.00%
Total 100.00% 100.00%
Assets of the Losango Plan    
Asset categories    
Equities 17.30% 18.80%
Fixed income 82.70% 81.20%
Real estate 0.00% 0.00%
Other 0.00% 0.00%
Total 100.00% 100.00%