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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
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 9,804,135,348 6,550,514,438  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018   3,268,045,116  
Cancellation of Shares (14,424,206) (14,424,206)  
Shares of capital stock, ending balance 9,804,135,348 9,804,135,348 6,550,514,438
Treasury shares, beginning balance 83,614,426 85,883,920  
Purchase of shares   13,100,000  
Cancellation of Shares (14,424,206) (14,424,206)  
Result of delivery of treasury shares (25,080,841) (29,623,265)  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018   28,677,977  
Treasury shares, ending balance 58,533,585 83,614,426 85,883,920
Outstanding shares 9,745,601,763 9,720,520,922 9,696,945,776
Beginning balance R$ 97,148 R$ 97,148  
Outstanding shares 9,745,601,763 9,720,520,922 9,696,945,776
Cancellation of Shares - Meeting of the Board of Directors   R$ 0  
Ending balance R$ 97,148 97,148 R$ 97,148
Treasury shares, value (1,820)    
Purchase of shares   (510) (3,089)
Result of delivery of treasury shares 897 1,321 R$ 1,114
Treasury shares, value R$ (1,274) R$ (1,820)  
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 4,958,290,359 3,319,951,112  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018   1,652,763,453  
Cancellation of Shares   (14,424,206)  
Shares of capital stock, ending balance 4,958,290,359 4,958,290,359 3,319,951,112
Treasury shares, beginning balance   14,424,206  
Cancellation of Shares   (14,424,206)  
Treasury shares, ending balance     14,424,206
Outstanding shares 4,958,290,359 4,958,290,359 4,958,290,359
Outstanding shares 4,958,290,359 4,958,290,359 4,958,290,359
Preference shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 4,845,844,989 3,230,563,326  
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 4,845,844,989 3,230,563,326
Treasury shares, beginning balance 83,614,426 71,459,714  
Purchase of shares   13,100,000  
Result of delivery of treasury shares (25,080,841) (29,623,265)  
Stock Split - ESM of 07/27/2018 - Approved on 10/31/2018   28,677,977  
Treasury shares, ending balance 58,533,585 83,614,426 71,459,714
Outstanding shares 4,787,311,404 4,762,230,563 4,738,655,417
Outstanding shares 4,787,311,404 4,762,230,563 4,738,655,417
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
Treasury shares, value R$ (1,820) R$ (2,743)  
Purchase of shares   (510) R$ (3,089)
Cancellation of Shares - Meeting of the Board of Directors   534 1,178
Result of delivery of treasury shares 546 899 1,050
Treasury shares, value R$ (1,274) R$ (1,820) R$ (2,743)
Brazil [Member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 6,537,131,486 4,415,364,847  
Shares of capital stock, ending balance 6,596,680,748 6,537,131,486 4,415,364,847
Beginning balance R$ 64,776 R$ 65,482  
Ending balance R$ 65,366 R$ 64,776 R$ 65,482
Brazil [Member] | Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 4,928,076,320 3,299,073,506  
Shares of capital stock, ending balance 4,931,023,416 4,928,076,320 3,299,073,506
Brazil [Member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 1,609,055,166 1,116,291,341  
Shares of capital stock, ending balance 1,665,657,332 1,609,055,166 1,116,291,341
Foreign [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 3,267,003,862 2,135,149,591  
Shares of capital stock, ending balance 3,207,454,600 3,267,003,862 2,135,149,591
Beginning balance R$ 32,372 R$ 31,666  
Ending balance R$ 31,782 R$ 32,372 R$ 31,666
Foreign [member] | Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 30,214,039 20,877,606  
Shares of capital stock, ending balance 27,266,943 30,214,039 20,877,606
Foreign [member] | Preference shares [member]      
Disclosure of classes of share capital [line items]      
Shares of capital stock, beginning balance 3,236,789,823 2,114,271,985  
Shares of capital stock, ending balance 3,180,187,657 3,236,789,823 2,114,271,985