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Fair Value of Financial Instruments - Summary of Carrying and Estimated Fair Values for Financial Instruments (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Central Bank compulsory deposits | R$ 94,148 | R$ 98,837 | R$ 85,700
At Amortized Cost | 994,759 | 905,729 | 902,289
Interbank deposits | 26,420 | 29,048 | 22,688
Securities purchased under agreements to resell | 280,136 | 244,707 | 265,050
Loan operations and lease operations portfolio | 536,091 | 497,719 | 494,851
Other financial assets | 75,090 | 59,568 | 53,895
Provision for Expected Loss | (33,373) | (36,737) | (36,763)
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 | 40,039
At Fair Value Through Profit or Loss | 286,646 | 273,536 | 218,805
Derivatives | 23,466 | 22,843 | 24,231
At amortized cost | 1,119,734 | 1,024,584 | 982,116
Deposits | 463,424 | 402,938 | 329,414
Securities sold under repurchase agreements | 330,237 | 312,634 | 349,164
Interbank market debt | 134,670 | 124,587 | 129,648
Other financial liabilities | 97,429 | 85,943 | 77,651
At Fair Value Through Profit or Loss | 27,711 | 27,211 | 25,217
Derivatives | 27,519 | 26,746 | 24,698
Structured notes | (192) | (465) | (519)
Provision for expected loss | 3,792 | 4,922 | 4,742
Loan Commitments | 2,601 | 3,015 | R$ 2,761
Financial Guarantees | 1,191 | 1,907 |
Carrying value [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Cash deposits on demand | 37,159 | 18,749 |
Financial assets | 1,424,876 | 1,330,251 |
Central Bank compulsory deposits | 94,148 | 98,837 |
At Amortized Cost | 994,759 | 905,729 |
Interbank deposits | 26,420 | 29,048 |
Securities purchased under agreements to resell | 280,136 | 244,707 |
Securities | 110,395 | 111,424 |
Loan operations and lease operations portfolio | 536,091 | 497,719 |
Other financial assets | 75,090 | 59,568 |
Provision for Expected Loss | (33,373) | (36,737) |
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 |
Securities | 49,323 | 52,149 |
At Fair Value Through Profit or Loss | 286,646 | 273,536 |
Securities | 263,180 | 250,693 |
Derivatives | 23,466 | 22,843 |
Financial liabilities | 1,151,237 | 1,056,717 |
At amortized cost | 1,119,734 | 1,024,584 |
Deposits | 463,424 | 402,938 |
Securities sold under repurchase agreements | 330,237 | 312,634 |
Interbank market debt | 134,670 | 124,587 |
Institutional market debt | 93,974 | 98,482 |
Other financial liabilities | 97,429 | 85,943 |
At Fair Value Through Profit or Loss | 27,711 | 27,211 |
Derivatives | 27,519 | 26,746 |
Structured notes | 192 | 465 |
Provision for expected loss | 3,792 | 4,922 |
Loan Commitments | 2,601 | 3,015 |
Financial Guarantees | 1,191 | 1,907 |
Estimated fair value [Member] |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |
Cash deposits on demand | 37,159 | 18,749 |
Financial assets | 1,433,116 | 1,338,314 |
Central Bank compulsory deposits | 94,148 | 98,837 |
At Amortized Cost | 1,002,999 | 913,792 |
Interbank deposits | 26,510 | 29,112 |
Securities purchased under agreements to resell | 280,136 | 244,707 |
Securities | 112,171 | 113,049 |
Loan operations and lease operations portfolio | 542,465 | 504,093 |
Other financial assets | 75,090 | 59,568 |
Provision for Expected Loss | (33,373) | (36,737) |
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 |
Securities | 49,323 | 52,149 |
At Fair Value Through Profit or Loss | 286,646 | 273,536 |
Securities | 263,180 | 250,693 |
Derivatives | 23,466 | 22,843 |
Financial liabilities | 1,150,700 | 1,054,981 |
At amortized cost | 1,119,197 | 1,022,848 |
Deposits | 463,363 | 402,911 |
Securities sold under repurchase agreements | 330,237 | 312,634 |
Interbank market debt | 134,533 | 124,257 |
Institutional market debt | 93,635 | 97,103 |
Other financial liabilities | 97,429 | 85,943 |
At Fair Value Through Profit or Loss | 27,711 | 27,211 |
Derivatives | 27,519 | 26,746 |
Structured notes | 192 | 465 |
Provision for expected loss | 3,792 | 4,922 |
Loan Commitments | 2,601 | 3,015 |
Financial Guarantees | R$ 1,191 | R$ 1,907 |

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