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Equity and Remuneration to Shareholders - Additional Information (Detail)
R$ / shares in Units, R$ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2019
BRL (R$)
Apr. 23, 2018
BRL (R$)
R$ / shares
shares
Apr. 30, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Installments
R$ / shares
shares
Dec. 31, 2017
BRL (R$)
R$ / shares
shares
Dec. 31, 2016
BRL (R$)
R$ / shares
shares
Dec. 31, 2015
BRL (R$)
Disclosure of reserves within equity [line items]              
Share capital   R$ 7,294   R$ 7,294 R$ 6,294 R$ 6,294  
Shares issued | shares   199,910,947   1,458,752,601 1,258,841,654 1,258,841,654  
Par value per share | R$ / shares   R$ 5.00   R$ 5.00 R$ 5.00 R$ 5.00  
Increase in capital   R$ 999          
Amount subscribed and paid-up by the shareholders       R$ 1,325      
Percentage of right to reduction in income tax       75.00%      
Period of right to reduction in income tax       10 years      
Right to reduction in income tax, starting period       2014      
Incentives tax       R$ 9 R$ 1 R$ 7  
Incentives tax reserve       R$ 67 R$ 58 57  
Percentage of shares owned       80.00%      
Mandatory dividends payout percentage       50.00%      
Minimum annual dividend percentage on par value       6.00% 6.00%    
Number of installments for dividend paid | Installments       2      
Retained earnings       R$ 6,362 R$ 5,729 5,200  
Equity       15,939 14,330 12,934 R$ 12,988
Interest on Equity       210      
Minimum mandatory dividend payable       R$ 657 500 167  
Major ordinary share transactions [member]              
Disclosure of reserves within equity [line items]              
Number of installments for dividend paid | Installments       2      
Proposed divided R$ 1,700            
Retained earnings (72)   R$ (72)        
Interest on Equity       R$ 210      
Equity in retained earnings reserve 751            
Equity in incentives tax reserve 9            
First adoption of IFRS 9 and IFRS 15 [member] | Major ordinary share transactions [member]              
Disclosure of reserves within equity [line items]              
Equity 157   157        
Realisation of deemed cost of PP & E 42            
Reversal of Expired dividends R$ 42            
Top of range [member]              
Disclosure of reserves within equity [line items]              
Percentage limit of Increase in share capital       10.00%      
Capital reserves [member]              
Disclosure of reserves within equity [line items]              
Subscription of shares, to be capitalized       R$ 325      
Equity       R$ 2,250 R$ 1,925 R$ 1,925 R$ 1,925
Common shares [member]              
Disclosure of reserves within equity [line items]              
Shares issued | shares   66,849,505   487,614,213 420,764,708 420,764,708  
Minimum percentage for multiple vote procedure       5.00%      
Mininum percentagae right to appoint board member       15.00%      
Common shares [member] | Major ordinary share transactions [member]              
Disclosure of reserves within equity [line items]              
Minimum mandatory dividend payable     657        
Preference shares [member]              
Disclosure of reserves within equity [line items]              
Shares issued | shares   133,061,442   971,138,388 838,076,946 838,076,946  
Minimum annual dividend percentage on par value       10.00%      
Minimum annual dividend percentage on equity portion       3.00%      
Preference shares [member] | Major ordinary share transactions [member]              
Disclosure of reserves within equity [line items]              
Minimum mandatory dividend payable     R$ 867        
Preferred shares [member]              
Disclosure of reserves within equity [line items]              
Mininum percentagae right to appoint board member       10.00%