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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