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14. Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost R$ 42,805,613 R$ 39,382,271    
Accumulated amortization (9,339,481) (8,135,483)    
Net 33,466,132 31,246,788 R$ 28,513,626 R$ 25,979,526
Agreements - equity value        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 8,893,296 9,222,543    
Accumulated amortization (1,751,682) (1,739,588)    
Net 7,141,614 7,482,955 7,287,630 7,369,271
Agreements - economic value        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 2,068,402 1,925,361    
Accumulated amortization (634,465) (543,709)    
Net 1,433,937 1,381,652 1,353,020 1,281,260
Program contracts        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 10,653,292 9,209,367    
Accumulated amortization (3,058,226) (2,633,346)    
Net 7,595,066 6,576,021 6,288,575 5,379,153
Program contracts - commitments        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 1,113,160 991,848    
Accumulated amortization (202,785) (168,632)    
Net 910,375 823,216 850,530 702,909
Services contracts – São Paulo        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 19,388,751 17,457,658    
Accumulated amortization (3,471,736) (2,904,951)    
Net 15,917,015 14,552,707 12,367,017 10,986,386
Software license        
SummaryOfIntangibleAssetsLineItems [Line Items]        
Cost 688,712 575,494    
Accumulated amortization (220,587) (145,257)    
Net R$ 468,125 R$ 430,237 R$ 366,854 R$ 260,547