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Risk and Capital Management - Summary of Liquidity Risk (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 218,334 | R$ 201,187
Liabilities(Duration in months) | 0 |
Assets(Duration in months) | 0 |
Pension plan, VGBL and individual life operations [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 214,646 | 197,378
Backing asset [Member] | Insurance Operations [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 3,688 | 3,809
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Related expenses [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 89 | 98
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Unearned Premiums [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 2,343 | R$ 2,111
Liabilities(Duration in months) | 59.1 | 56.7
Assets(Duration in months) | 22.9 | 12.6
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | IBNR, PDR e PSL [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 875 | R$ 927
Liabilities(Duration in months) | 49.9 | 48.0
Assets(Duration in months) | 29.0 | 18.5
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Other Provision [member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 250 | R$ 562
Liabilities(Duration in months) | 6.9 | 99.2
Assets(Duration in months) |  | 32.3
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Redemptions And Other Unsettled Amounts [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 7.9 | 14.9
Assets(Duration in months) | 22.9 | 12.5
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Mathematical reserve for benifits to be granted and benefits granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 205 |
LFT, repurchase agreements, NTN-B, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Related expenses [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 126.2 | 128.4
Assets(Duration in months) | 82.6 | 75.9
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Unearned Premiums [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 13 | R$ 13
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Unsettled Claims [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 48 | 43
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | IBNR [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 22 | 25
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Redemptions And Other Unsettled Amounts [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 13 | R$ 13
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Mathematical reserve for benifits to be granted and benefits granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Assets(Duration in months) | 2.6 |
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Unearned Premiums [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 11.1 | 15.4
Assets(Duration in months) | 20.8 | 11.0
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Unsettled Claims [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 11.1 | 15.4
Assets(Duration in months) | 20.8 | 11.0
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | IBNR [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 11.1 | 15.4
Assets(Duration in months) | 20.8 | 11.0
LFT, repurchase agreements, NTN-B, CDB and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Redemptions And Other Unsettled Amounts [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 318 | R$ 297
Liabilities(Duration in months) | 11.1 | 15.4
Assets(Duration in months) | 20.8 | 11.0
LFT, repurchase agreements, LTN, NTN-B, NTN-C, NTN-F, CDB, LF and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical Reserve For Benefits Granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 2,781 | R$ 2,808
LFT, repurchase agreements, LTN, NTN-B, NTN-C, NTN-F, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Financial surplus [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 2 | R$ 2
Assets(Duration in months) | 22.9 |
LFT, repurchase agreements, LTN, NTN-B, NTN-C, NTN-F, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical Reserve For Benefits Granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) |  | 120.4
Assets(Duration in months) |  | 71.4
LFT, repurchase agreements, LTN, NTN-B, NTN-C, NTN-F, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical reserve for benefits to be granted - PGBL/ VGBL [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 204,392 |
Liabilities(Duration in months) | 180.6 | 182.0
Assets(Duration in months) | 57.0 | 28.2
LFT, repurchase agreements, NTN-B, NTN-C, debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical reserve for benefits to be granted - traditional [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 5,099 | R$ 4,633
LFT, repurchase agreements, NTN-B, NTN-C, debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Mathematical reserve for benifits to be granted and benefits granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) |  | R$ 194
Liabilities(Duration in months) | 16.9 | 19.7
Assets(Duration in months) |  | 2.3
LFT, repurchase agreements, NTN-B, NTN-C, debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical reserve for benefits to be granted - traditional [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 199.8 | 209.0
Assets(Duration in months) | 110.1 | 91.7
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Other Provision [member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 1,273 | R$ 948
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Financial surplus [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 611 | R$ 605
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Other Provision [member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Assets(Duration in months) | 104.5 |
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Insurance Operations [Member] | Financial surplus [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 222.4 | 218.0
Assets(Duration in months) |  | 12.5
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Other Provision [member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 199.7 | 165.5
Assets(Duration in months) | 110.1 | 91.7
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical Reserve For Benefits Granted [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 126.2 |
Assets(Duration in months) | 82.8 |
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Mathematical reserve for benefits to be granted - PGBL/ VGBL [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) |  | R$ 187,908
LFT, repurchase agreements, NTN-B, NTN-C, CDB, LF and debentures [Member] | Backing asset [Member] | Pension plan, VGBL and individual life operations [Member] | Financial surplus [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) | 199.8 | 208.8
Assets(Duration in months) | 110.1 | 91.5

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