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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Reinsurance Transactions [Line Items]          
(-) IBNER R$ 373 R$ 428      
Claims development [member]          
Disclosure of Reinsurance Transactions [Line Items]          
Provision for unsettled claims (PSL) (*) 591        
(-) IBNER 170        
(-) Reinsurance 35        
Retrocession and other estimates (25)        
Liability claims presented in the development table (a + b) 411        
Administratives claims [member] | Net Reinsurance [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 992 934 R$ 938 R$ 1,009 R$ 910
Accumulated payments through base date 815 956 978 1,078 962
Accumulated payments through base date to current date 4,789        
Liabilities recognized in the balance sheet 178 21 23 13 5
Accumulated liabilities recognized in the balance sheet 240        
Liabilities in relation to prior periods 12        
Total administratives claims 252        
Administratives claims [member] | Net Reinsurance [Member] | Up to one year [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period   977 981 1,054 935
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     1,001 1,082 958
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       1,091 964
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         967
Administratives claims [member] | Net Reinsurance [Member] | Over 5 years [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 992 977 1,001 1,091 967
Judicial claims [member] | Net Reinsurance [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period 16 28 26 30 27
Accumulated payments through base date 10 30 34 49 45
Accumulated payments through base date to current date 168        
Liabilities recognized in the balance sheet 5 10 10 15 15
Accumulated liabilities recognized in the balance sheet 55        
Liabilities in relation to prior periods 104        
Total administratives claims 159        
Judicial claims [member] | Net Reinsurance [Member] | Up to one year [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
At the end of reporting period   40 35 41 37
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     43 52 46
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       64 54
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         60
Judicial claims [member] | Net Reinsurance [Member] | Over 5 years [Member]          
Disclosure of Reinsurance Transactions [Line Items]          
Current estimate R$ 16 R$ 40 R$ 43 R$ 64 R$ 60