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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

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