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Loans and Debentures - Summary of Changes in Loans, Debentures and Finance Leases (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loans debentures and finance leases details 1 [abstract]    
Loans, debentures and finance leases, beginning R$ 15,116,139 R$ 13,426,845
New loans and debentures with cash effect 2,105,737 4,461,112
Interest accrued 845,844 873,202
Principal payment/ installments for financial leasing (2,644,704) (3,715,838)
Interest payment (1,469,780) (737,564)
Monetary and exchange rate variation 296,441 804,273
Change in fair value 113,060 50,175
Adoption IFRS 16 – transfer to Note 13.b 1,363,803 (46,066)
Loans, debentures and finance leases, ending R$ 14,362,737 R$ 15,116,139