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Income and Social Contribution Taxes - Summary of Reconciliation of Taxes (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income and social contribution taxes details 4 [abstract]      
Income before taxes and share of profit (loss) of subsidiaries, joint ventures, and associates R$ 793,698 R$ 1,785,818 R$ 2,318,446
Statutory tax rates 34.00% 34.00% 34.00%
Income and social contribution taxes at the statutory tax rates R$ (269,857) R$ (607,178) R$ (788,272)
Adjustments to the statutory income and social contribution taxes:      
Nondeductible expenses (68,795) (82,784) (105,017)
Nontaxable revenues 28,235 32,523 19,084
Adjustment to estimated income 10,511 9,706 10,844
Interest on equity 0 (538) (550)
Contribution Taxes Carryforwards deferred (146,820) (95,480)  
Other adjustments 24,873 (2,634) 2,059
Income and social contribution taxes before tax incentives (421,853) (746,385) (861,852)
Tax incentives—SUDENE 43,244 107,666 48,598
Income and social contribution taxes in the income statement (378,609) (638,719) (813,254)
Current (476,074) (476,302) (922,458)
Deferred R$ 97,465 R$ (162,417) R$ 109,204
Effective IRPJ and CSLL rates 47.70% 35.80% 35.10%