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Significant Accounting Policies - Summary of Reconciliation of Stockholders' Equity (Detail) - BRL (R$) R$ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items] |  |  |  |  |
In accordance with IAS 39 (excluding non-controlling interests) |  | R$ 24,907 | R$ 23,193 | R$ 21,627 |
In accordance with IFRS 9 - attributable to non-controlling stockholders |  | 732 | 32 | 389 |
Net income |  | 25,639 | 23,225 | 22,016 |
Other financial assets |  | (75,090) | (59,568) |  | R$ (53,895)
Interest of non-controllingstockholders |  | R$ 13,684 | 12,978 |  | R$ 12,289
Stockholders Equity [Member] | In Accordance With IAS 39 [member] |  |  |  |  |
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items] |  |  |  |  |
In accordance with IAS 39 (excluding non-controlling interests) | R$ 112,252 |  | 134,840 | 122,582 |
Adjustments arising from changes in the financial asset derecognition policy, net of tax effects | 2,280 |  | 2,402 | 2,462 |
In accordance with IAS 39 (excluding non-controlling interests) | 114,532 |  | 137,242 | 125,044 |
Expected loss | (4,615) |  | (9,858) | (7,915) |
Loan operations and Finance leases | (5,189) |  | (8,574) | (7,385) |
Other financial assets | 574 |  | (1,284) | (530) |
Change in financial assets |  |  | 138 | 36 |
Adjustment to fair value of financial assets | (661) |  | (540) | (787) |
Effect of adoption of investments in Associates / Joint ventures |  |  | (116) |  |
Deferred taxes on the above adjustments | 2,534 |  | 4,324 | 3,774 |
Interest of non-controllingstockholders | 187 |  | 188 | (57) |
Total adjustments | (2,555) |  | (5,864) | (4,949) |
Stockholders Equity [Member] | IFRS9 [member] |  |  |  |  |
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items] |  |  |  |  |
In accordance with IAS 39 (excluding non-controlling interests) | 111,977 |  | 131,378 | 120,095 |
In accordance with IFRS 9 - attributable to non-controlling stockholders | 1,620 |  | 12,978 | 12,289 |
Net income | R$ 113,597 |  | 144,356 | 132,384 |
Income [member] | In Accordance With IAS 39 [member] |  |  |  |  |
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items] |  |  |  |  |
In accordance with IAS 39 (excluding non-controlling interests) |  |  | 23,903 | 23,263 |
Adjustments arising from changes in the financial asset derecognition policy, net of tax effects |  |  | (78) | 201 |
In accordance with IAS 39 (excluding non-controlling interests) |  |  | 23,825 | 23,464 |
Expected loss |  |  | (1,948) | (3,438) |
Loan operations and Finance leases |  |  | (1,192) | (2,259) |
Other financial assets |  |  | (756) | (1,179) |
Change in financial assets |  |  | 101 | 36 |
Adjustment to fair value of financial assets |  |  | 359 | 514 |
Deferred taxes on the above adjustments |  |  | 522 | 1,164 |
Interest of non-controllingstockholders |  |  | 334 | (113) |
Total adjustments |  |  | (632) | (1,837) |
Income [member] | IFRS9 [member] |  |  |  |  |
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items] |  |  |  |  |
In accordance with IAS 39 (excluding non-controlling interests) |  |  | 23,193 | 21,627 |
In accordance with IFRS 9 - attributable to non-controlling stockholders |  |  | 32 | 389 |
Net income |  |  | R$ 23,225 | R$ 22,016 |

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