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Taxes - Summary of Realization and Present Value of Tax Credits and From Provision for Deferred Income Tax and Social Contribution (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 34,749    
Temporary differences, percentage 100.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 4,391    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 100.00%    
Deferred tax assets R$ 39,140 R$ 51,002 R$ 52,964
Deferred tax assets, percentage 100.00%    
Deferred tax liabilities R$ (6,806)    
Deferred tax liabilities, percentage 100.00%    
Net deferred taxes R$ 32,334    
Net deferred taxes,percentage 100.00%    
Present value of temporary differences R$ 31,526    
Present value of tax loss /social contribution loss carryforwards 3,859    
Present value of deferred tax assets 35,384    
Present value of deferred tax liabilities (5,735)    
Present value of net deferred taxes 29,649    
Up to one year [Member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 10,808    
Temporary differences, percentage 31.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 1,394    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 32.00%    
Deferred tax assets R$ 12,202    
Deferred tax assets, percentage 31.00%    
Deferred tax liabilities R$ (1,333)    
Deferred tax liabilities, percentage 20.00%    
Net deferred taxes R$ 10,869    
Net deferred taxes,percentage 33.00%    
Later than one year and not later than two years [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 12,961    
Temporary differences, percentage 38.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 751    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 17.00%    
Deferred tax assets R$ 13,712    
Deferred tax assets, percentage 35.00%    
Deferred tax liabilities R$ (1,258)    
Deferred tax liabilities, percentage 18.00%    
Net deferred taxes R$ 12,454    
Net deferred taxes,percentage 39.00%    
Later than one year and not later than three years [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 4,575    
Temporary differences, percentage 13.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 614    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 14.00%    
Deferred tax assets R$ 5,189    
Deferred tax assets, percentage 13.00%    
Deferred tax liabilities R$ (432)    
Deferred tax liabilities, percentage 6.00%    
Net deferred taxes R$ 4,757    
Net deferred taxes,percentage 15.00%    
Later than three years and not later than four years [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 813    
Temporary differences, percentage 2.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 395    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 9.00%    
Deferred tax assets R$ 1,208    
Deferred tax assets, percentage 3.00%    
Deferred tax liabilities R$ (1,069)    
Deferred tax liabilities, percentage 16.00%    
Net deferred taxes R$ 139    
Net deferred taxes,percentage 0.00%    
Later than four years and not later than five years [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 685    
Temporary differences, percentage 2.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 157    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 3.00%    
Deferred tax assets R$ 842    
Deferred tax assets, percentage 2.00%    
Deferred tax liabilities R$ (142)    
Deferred tax liabilities, percentage 2.00%    
Net deferred taxes R$ 700    
Net deferred taxes,percentage 2.00%    
Over 5 years [Member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 4,907    
Temporary differences, percentage 14.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 1,080    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 25.00%    
Deferred tax assets R$ 5,987    
Deferred tax assets, percentage 16.00%    
Deferred tax liabilities R$ (2,572)    
Deferred tax liabilities, percentage 38.00%    
Net deferred taxes R$ 3,415    
Net deferred taxes,percentage 11.00%