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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Gross Carrying Amount and Fair Value of Financial Assets Through Other Comprehensive Income-Securities by Maturity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | R$ 10,666 | R$ 9,546 |
Current Fair value | 10,684 | 9,666 |
Non-current gross carrying amount | 37,997 | 41,662 |
Non-current fair value | 38,639 | 42,483 |
Gross carrying amount | 48,663 | 51,208 |
Fair value | 49,323 | 52,149 | R$ 40,039
Non-stated maturity [Member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 77 | 73 |
Current Fair value | 161 | 148 |
Up to one year [Member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 10,589 | 9,473 |
Current Fair value | 10,523 | 9,518 |
From one to five years [Member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Non-current gross carrying amount | 21,417 | 23,138 |
Non-current fair value | 21,650 | 23,415 |
From five to ten years [Member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Non-current gross carrying amount | 11,906 | 11,368 |
Non-current fair value | 12,029 | 11,680 |
After ten years [Member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Non-current gross carrying amount | 4,674 | 7,156 |
Non-current fair value | R$ 4,960 | R$ 7,388 |

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