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Insurance Contracts and Private Pension - Summary of Claims Development (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Reinsurance Transactions [Line Items]          
(-) IBNER R$ 373 R$ 299      
Claims development [member]          
Disclosure of Reinsurance Transactions [Line Items]          
Provision for unsettled claims (PSL) (*) 618        
(-) IBNER 258        
(-) Reinsurance 37        
Retrocession and other estimates (17)        
Liability claims presented in the development table (a + b) 340        
Administratives claims [member] | Net Reinsurance [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 993 1,149 R$ 934 R$ 938 R$ 1,009
Accumulated payments through base date 994 1,028 961 1,061 1,075
Accumulated payments through base date to current date   5,119      
Liabilities recognized in the balance sheet 18 121 14 17 10
Accumulated liabilities recognized in the balance sheet   180      
Liabilities in relation to prior periods   17      
Total administratives claims   197      
Administratives claims [member] | Net Reinsurance [Member] | Up to one year [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 1,012   977 981 1,054
Administratives claims [member] | Net Reinsurance [Member] | Later than one year and not later than two years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period     975 1,001 1,082
Administratives claims [member] | Net Reinsurance [Member] | Later than two years and not later than three years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period       1,078 1,091
Administratives claims [member] | Net Reinsurance [Member] | Later than four years and not later than five years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period         1,084
Administratives claims [member] | Net Reinsurance [Member] | Over 5 years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 1,012 1,149 975 1,078 1,084
Judicial claims [member] | Net Reinsurance [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 16 20 28 26 30
Accumulated payments through base date 27 14 44 44 61
Accumulated payments through base date to current date   190      
Liabilities recognized in the balance sheet 7 6 8 11 10
Accumulated liabilities recognized in the balance sheet   42      
Liabilities in relation to prior periods   101      
Total administratives claims   143      
Judicial claims [member] | Net Reinsurance [Member] | Up to one year [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 33   40 35 41
Judicial claims [member] | Net Reinsurance [Member] | Later than one year and not later than two years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period     51 43 52
Judicial claims [member] | Net Reinsurance [Member] | Later than two years and not later than three years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period       55 64
Judicial claims [member] | Net Reinsurance [Member] | Later than four years and not later than five years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period         71
Judicial claims [member] | Net Reinsurance [Member] | Over 5 years [member]          
Disclosure of Reinsurance Transactions [Line Items]          
Current estimate R$ 33 R$ 20 R$ 51 R$ 55 R$ 71