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3. Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination (Details 3)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Dec. 31, 2017
BRL (R$)
R$ / shares
Principles Of Consolidation Investments In Subsidiaries Acquisitions Under Approval And Business Combination Details 3  
Net revenue from sale and services R$ 80,785,084
Operating income 2,834,636
Net income for the year R$ 1,555,077
Earnings per share basic - whole | R$ / shares R$ 2.8709
Earnings per share diluted - whole | R$ / shares R$ 2.8503