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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 43,149    
Temporary differences, percentage 100.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 2,585    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 100.00%    
Deferred tax assets R$ 45,734 R$ 39,140 R$ 51,002
Deferred tax assets, percentage 100.00%    
Deferred tax liabilities R$ (7,878)    
Deferred tax liabilities, percentage 100.00%    
Net deferred taxes R$ 37,856    
Net deferred taxes,percentage 100.00%    
Present value of temporary differences R$ 40,354    
Present value of tax loss /social contribution loss carryforwards 2,381    
Present value of deferred tax assets 42,735    
Present value of deferred tax liabilities (6,923)    
Present value of net deferred taxes 35,812    
Up to one year [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 12,987    
Temporary differences, percentage 30.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 1,184    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 46.00%    
Deferred tax assets R$ 14,171    
Deferred tax assets, percentage 31.00%    
Deferred tax liabilities R$ (1,487)    
Deferred tax liabilities, percentage 19.00%    
Net deferred taxes R$ 12,684    
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$ 10,614    
Temporary differences, percentage 25.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 177    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 7.00%    
Deferred tax assets R$ 10,791    
Deferred tax assets, percentage 23.00%    
Deferred tax liabilities R$ (614)    
Deferred tax liabilities, percentage 8.00%    
Net deferred taxes R$ 10,177    
Net deferred taxes,percentage 27.00%    
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$ 6,598    
Temporary differences, percentage 15.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 44    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 2.00%    
Deferred tax assets R$ 6,642    
Deferred tax assets, percentage 15.00%    
Deferred tax liabilities R$ (542)    
Deferred tax liabilities, percentage 7.00%    
Net deferred taxes R$ 6,100    
Net deferred taxes,percentage 16.00%    
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$ 4,276    
Temporary differences, percentage 10.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 37    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 1.00%    
Deferred tax assets R$ 4,313    
Deferred tax assets, percentage 9.00%    
Deferred tax liabilities R$ (284)    
Deferred tax liabilities, percentage 3.00%    
Net deferred taxes R$ 4,029    
Net deferred taxes,percentage 11.00%    
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$ 2,062    
Temporary differences, percentage 5.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 559    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 21.00%    
Deferred tax assets R$ 2,621    
Deferred tax assets, percentage 6.00%    
Deferred tax liabilities R$ (437)    
Deferred tax liabilities, percentage 6.00%    
Net deferred taxes R$ 2,184    
Net deferred taxes,percentage 6.00%    
Over 5 years [member]      
Disclosure of estimate of realization and present value of net deferred taxes [line items]      
Temporary differences R$ 6,612    
Temporary differences, percentage 15.00%    
Deferred tax assets Tax loss /social contribution loss Carryforwards R$ 584    
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage 23.00%    
Deferred tax assets R$ 7,196    
Deferred tax assets, percentage 16.00%    
Deferred tax liabilities R$ (4,514)    
Deferred tax liabilities, percentage 57.00%    
Net deferred taxes R$ 2,682    
Net deferred taxes,percentage 7.00%