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Stockholders' equity - Summary of Change in Shares of Paid-in Capital and Reconciliation of Balances (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Feb. 22, 2018
Dec. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     9,825,771,656 9,873,461,313  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     3,268,045,116    
Cancellation of Shares     (14,424,206) (47,689,657)  
Shares of capital stock, ending balance     9,804,135,348 9,825,771,656 9,873,461,313
Treasury shares, beginning balance     128,825,880 104,411,304  
Purchase of shares     13,100,000 126,295,705  
Cancellation of Shares     (14,424,206) (47,689,657)  
Result of delivery of treasury shares     (29,623,265) (54,191,472)  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     28,677,977    
Treasury shares, ending balance     83,614,426 128,825,880 104,411,304
Outstanding shares     9,720,520,922 9,696,945,776 9,769,050,010
Beginning balance     R$ 97,148 R$ 97,148  
Outstanding shares     9,720,520,922 9,696,945,776 9,769,050,010
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     R$ 0    
Cancellation of Shares - Meeting of the Board of Directors     0 R$ 0  
Ending balance     97,148 97,148 R$ 97,148
Treasury shares, value     (2,743)    
Purchase of shares     (510) (3,089) (947)
Cancellation of Shares - Meeting of the Board of Directors     0    
Result of delivery of treasury shares     1,321 1,114 R$ 731
Treasury shares, value     R$ (1,820) R$ (2,743)  
Ordinary shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     4,979,926,668 5,027,616,325  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     1,652,763,453    
Cancellation of Shares (14,424,206) (31,793,105) (14,424,206) (47,689,657)  
Shares of capital stock, ending balance     4,958,290,359 4,979,926,668 5,027,616,325
Treasury shares, beginning balance     21,636,309 4,611  
Purchase of shares       69,321,355  
Cancellation of Shares (14,424,206) (31,793,105) (14,424,206) (47,689,657)  
Treasury shares, ending balance       21,636,309 4,611
Outstanding shares     4,958,290,359 4,958,290,359 5,027,611,714
Outstanding shares     4,958,290,359 4,958,290,359 5,027,611,714
Preference shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     4,845,844,988 4,845,844,988  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     1,615,281,663    
Shares of capital stock, ending balance     4,845,844,989 4,845,844,988 4,845,844,988
Treasury shares, beginning balance     107,189,571 104,406,693  
Purchase of shares     13,100,000 56,974,350  
Result of delivery of treasury shares     (29,623,265) (54,191,472)  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     28,677,977    
Treasury shares, ending balance     83,614,426 107,189,571 104,406,693
Outstanding shares     4,762,230,563 4,738,655,417 4,741,438,296
Outstanding shares     4,762,230,563 4,738,655,417 4,741,438,296
Treasury shares [member]          
Disclosure of classes of share capital [line items]          
Treasury shares, value     R$ (2,743) R$ (1,882)  
Purchase of shares     (510) (3,089) R$ (947)
Cancellation of Shares - Meeting of the Board of Directors     534 1,178 2,670
Result of delivery of treasury shares     899 1,050 748
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018     0    
Treasury shares, value     R$ (1,820) R$ (2,743) R$ (1,882)
Brazil [Member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     6,623,047,270 6,660,471,062  
Shares of capital stock, ending balance     6,537,131,486 6,623,047,270 6,660,471,062
Beginning balance     R$ 65,482 R$ 65,534  
Ending balance     R$ 64,776 R$ 65,482 R$ 65,534
Brazil [Member] | Ordinary shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     4,948,610,259 5,003,025,466  
Shares of capital stock, ending balance     4,928,076,320 4,948,610,259 5,003,025,466
Brazil [Member] | Preference shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     1,674,437,011 1,657,445,596  
Shares of capital stock, ending balance     1,609,055,166 1,674,437,011 1,657,445,596
Foreign [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     3,202,724,386 3,212,990,251  
Shares of capital stock, ending balance     3,267,003,862 3,202,724,386 3,212,990,251
Beginning balance     R$ 31,666 R$ 31,614  
Ending balance     R$ 32,372 R$ 31,666 R$ 31,614
Foreign [member] | Ordinary shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     31,316,409 24,590,859  
Shares of capital stock, ending balance     30,214,039 31,316,409 24,590,859
Foreign [member] | Preference shares [member]          
Disclosure of classes of share capital [line items]          
Shares of capital stock, beginning balance     3,171,407,977 3,188,399,392  
Shares of capital stock, ending balance     3,236,789,823 3,171,407,977 3,188,399,392