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Risk and Capital Management - Summary of Liquidity Risk (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 214,976 | R$ 221,000
Pension plan, VGBL and individual life operations [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 211,093 | 217,697
Backing asset [Member] | Insurance Operations [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | 3,883 | 3,303
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) | R$ 65 | R$ 88
Liabilities(Duration in months) | 103.8 | 109.4
Assets(Duration in months) | 76.3 | 81.3
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$ 2,846 | R$ 2,298
Liabilities(Duration in months) | 55.6 | 57.8
Assets(Duration in months) | 20.3 | 19.1
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$ 869 | R$ 838
Liabilities(Duration in months) | 48.6 | 50.9
Assets(Duration in months) | 27.0 | 27.2
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$ 129 |
Liabilities(Duration in months) | 7.0 | 7.0
Assets(Duration in months) | 90.0 | 96.4
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 (Amount) | R$ 19 | R$ 16
Liabilities(Duration in months) | 17.9 | 16.3
Assets(Duration in months) | 20.3 | 18.3
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$ 12 | R$ 12
Liabilities(Duration in months) | 16.0 | 17.4
Assets(Duration in months) | 18.5 | 22.2
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) | R$ 79 | R$ 68
Liabilities(Duration in months) | 16.0 | 17.4
Assets(Duration in months) | 18.5 | 22.2
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) | R$ 27 | R$ 22
Liabilities(Duration in months) | 16.0 | 17.4
Assets(Duration in months) | 18.5 | 22.2
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$ 358 | R$ 332
Liabilities(Duration in months) | 16.0 |
Assets(Duration in months) | 18.5 | 22.2
LFT, repurchase agreements, LTN, NTN-B, NTN-C, NTN-F, CDB, LF and debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Other Provision [member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Assets(Duration in months) | 79.8 |
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$ 3,786 | R$ 3,278
Liabilities(Duration in months) | 103.8 | 109.4
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 to be granted - PGBL/ VGBL [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities (Amount) | R$ 197,897 | R$ 205,670
Liabilities(Duration in months) | 134.0 | 166.5
Assets(Duration in months) | 55.2 | 56.2
LFT, repurchase agreements, NTN-B, NTN-C, debentures [Member] | Pension plan, VGBL and individual life operations [Member] | Redemptions And Other Unsettled Amounts [Member] |  |
Disclosure Of Liquidity Risk [Line Items] |  |
Liabilities(Duration in months) |  | 17.4
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$ 7,513 | R$ 6,268
Liabilities(Duration in months) | 195.9 | 188.5
Assets(Duration in months) | 79.8 | 80.9
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$ 19 | R$ 17
Liabilities(Duration in months) | 122.6 | 172.6
Assets(Duration in months) | 27.4 | 24.0
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$ 665 | R$ 1,304
Liabilities(Duration in months) | 195.9 | 188.4
Assets(Duration in months) |  | 80.9
LFT, repurchase agreements, NTN-B, NTN-C, 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] |  |
Assets(Duration in months) | 76.4 | 81.4
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$ 691 | R$ 655
Liabilities(Duration in months) | 195.9 | 188.5
Assets(Duration in months) | 79.8 | 80.9
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] |  |
Liabilities (Amount) |  | R$ 132
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 (Amount) | R$ 1 | R$ 2
Liabilities(Duration in months) | 149.5 | 204.1
Assets(Duration in months) | 20.3 | 18.3

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