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Insurance Contracts and Private Pension - Summary of Deferred Acquisition Costs (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reinsurance assets [Line Items]    
Beginning Balance R$ 253 R$ 429
Increase 1,001 772
Amortization (845) (948)
Ending Balance 409 253
Up to one year [Member]    
Disclosure of reinsurance assets [Line Items]    
Beginning Balance 209  
Ending Balance 334 209
Non-current [Member]    
Disclosure of reinsurance assets [Line Items]    
Beginning Balance 44  
Ending Balance R$ 75 R$ 44