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14. Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning R$ 31,246,788 R$ 28,513,626 R$ 25,979,526
Additions 3,490,298 3,855,831 3,604,442
Contract renewal 0 0 0
Reversal of estimated losses 13,380 (10,198) 24,085
Transfers (9,374) 12,572 (6,090)
Write-offs and disposals (24,412) (14,808) (45,808)
Amortization (1,250,548) (1,110,235) (1,042,529)
Intangible assets, ending 33,466,132 31,246,788 28,513,626
Agreements - equity value      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 7,482,955 7,287,630 7,369,271
Additions 374,775 391,545 574,421
Contract renewal (531,818) (9,587) (463,362)
Reversal of estimated losses 2,078 (1,335) 747
Transfers 1,663 1,014 (324)
Write-offs and disposals (2,795) (6,233) (4,303)
Amortization (185,244) (180,079) (188,820)
Intangible assets, ending 7,141,614 7,482,955 7,287,630
Agreements - economic value      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 1,381,652 1,353,020 1,281,260
Additions 142,429 106,307 140,732
Contract renewal 0 0 0
Reversal of estimated losses 8 (8) 0
Transfers 2,604 6 (17)
Write-offs and disposals (1,163) (110) (139)
Amortization (91,593) (77,563) (68,816)
Intangible assets, ending 1,433,937 1,381,652 1,353,020
Program contracts      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 6,576,021 6,288,575 5,379,153
Additions 772,278 553,126 663,399
Contract renewal 531,818 9,587 463,362
Reversal of estimated losses 4,834 (4,360) 4,459
Transfers (1,784) 2,023 (752)
Write-offs and disposals (6,606) (5,571) (11,045)
Amortization (281,495) (267,359) (210,001)
Intangible assets, ending 7,595,066 6,576,021 6,288,575
Program contracts - commitments      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 823,216 850,530 702,909
Additions 121,313 5,762 177,424
Contract renewal 0 0 0
Reversal of estimated losses 0 0 0
Transfers 0 0 0
Write-offs and disposals 0 0 0
Amortization (34,154) (33,076) (29,803)
Intangible assets, ending 910,375 823,216 850,530
Services contracts – São Paulo      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 14,552,707 12,367,017 10,986,386
Additions 1,976,079 2,697,724 1,900,218
Contract renewal 0 0 0
Reversal of estimated losses 6,460 (4,495) 18,879
Transfers (18,346) 9,696 (4,997)
Write-offs and disposals (13,848) (2,894) (30,321)
Amortization (586,037) (514,341) (503,148)
Intangible assets, ending 15,917,015 14,552,707 12,367,017
Software license      
SummaryOfIntangibleAssetsLineItems [Line Items]      
Intangible assets, beginning 430,237 366,854 260,547
Additions 103,424 101,367 148,248
Contract renewal 0 0 0
Reversal of estimated losses 0 0 0
Transfers 6,489 (167) 0
Write-offs and disposals 0 0 0
Amortization (72,025) (37,817) (41,941)
Intangible assets, ending R$ 468,125 R$ 430,237 R$ 366,854