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Equity and Remuneration to Shareholders - Schedule of Dividends Proposed for Distribution to Shareholders Based on the Profit for the Business Year (Detail) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Dividends [line items]        
Percentage applied to the nominal value of the preferred shares 6.00% 6.00%    
Equity R$ 15,939 R$ 14,330 R$ 12,934 R$ 12,988
Net income for the year 1,700 1,001 334  
Withholding income tax on Interest on equity 17      
Minimum Dividend under the by-laws including income tax on interest on equity 867 500 167  
Dividends recorded, as specified in the by-laws Interest on Equity 210      
Ordinary dividends 657 500 167  
Dividends and interest on equity R$ 867 R$ 500 R$ 167  
Mandatory dividends (including withholding income tax on Interest on Equity) R$ 0.59 R$ 0.34 R$ 0.50  
Dividend distribution [Member]        
Disclosure of Dividends [line items]        
Equity R$ 14,579 R$ 14,326 R$ 12,930  
Net income for the year R$ 1,700 1,001 334  
Preference shares [member]        
Disclosure of Dividends [line items]        
Percentage applied to the nominal value of the preferred shares 10.00%      
Percentage applied to the portion of Equity represented by the preferred shares 3.00%      
Preference shares [member] | Dividend distribution [Member]        
Disclosure of Dividends [line items]        
Nominal value of the preferred shares R$ 4,856 4,191 4,190  
Nominal value of the preferred shares to be capitalized   665    
Preferred shares R$ 4,856 R$ 4,856 R$ 4,190  
Percentage applied to the nominal value of the preferred shares 10.00% 10.00% 10.00%  
Amount of the dividends by the first payment criterion R$ 486 R$ 486 R$ 419  
Preferred shares as a percentage of Equity (net of shares held in Treasury) 66.58% 66.58% 66.58%  
Equity R$ 9,704 R$ 9,538 R$ 8,609  
Percentage applied to the portion of Equity represented by the preferred shares 3.00% 3.00% 3.00%  
Amount of the dividends by the second payment criterion R$ 291 R$ 286 R$ 258  
Minimum Dividends required by the Bylaws for the preferred shares 486 486 419  
Mandatory dividends - 50% of Net income 850 500 167  
Preferred shares [member]        
Disclosure of Dividends [line items]        
Total dividends for the common shares R$ 577 R$ 486 R$ 419  
Minimum dividends required by the by-laws for the preferred shares R$ 0.50 R$ 0.50 R$ 0.50  
Dividends proposed: Common (ON) shares R$ 0.59 R$ 0.50    
Common shares [member]        
Disclosure of Dividends [line items]        
Total dividends for the common shares R$ 290 R$ 14    
Dividends proposed: Common (ON) shares R$ 0.59 R$ 0.03 R$ 0.50