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Hedge Accounting - Schedule of Each Strategy of Nominal Value and Fair Value Adjustments of Hedge Instruments and Book Value of Hedged Item (Detail) - BRL (R$)
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value R$ 126,549,000,000 R$ 171,439,000,000
Hedge instruments, fair value adjustments 2,378,000,000 1,215,000,000
Hedge of deposits and repurchase agreements [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 29,727,000,000 62,667,000,000
Hedge instruments, fair value adjustments (21,000,000) (32,000,000)
Hedge instruments, Book Value 29,727,000,000 62,667,000,000
Hedge of highly probable forecast transactions [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 71,000,000 232,000,000
Hedge instruments, fair value adjustments 6,000,000 9,000,000
Hedge instruments, Book Value 71,000,000 219,000,000
Hedge of assets transactions [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 8,003,000,000 23,919,000,000
Hedge instruments, fair value adjustments 136,000,000 2,000,000
Hedge instruments, Book Value 7,866,000,000 23,490,000,000
Hedge of asset backed securities under repurchase agreements [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 38,013,000,000 31,855,000,000
Hedge instruments, fair value adjustments 8,000,000 11,000,000
Hedge instruments, Book Value 36,668,000,000 31,099,000,000
Hedge of assets denominated in UF [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 13,221,000,000 15,227,000,000
Hedge instruments, fair value adjustments 23,000,000 (28,000,000)
Hedge instruments, Book Value 13,247,000,000 15,227,000,000
Hedge of fair value through other comprehensive income [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 5,401,000,000 482,000,000
Hedge instruments, fair value adjustments (82,000,000) 34,000,000
Hedge instruments, Book Value 5,391,000,000 482,000,000
Hedges of net investment in foreign operations [member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 12,550,000,000 10,561,000,000
Hedge instruments, fair value adjustments 2,230,000,000 1,283,000,000
Hedge instruments, Book Value 14,820,000,000 13,074,000,000
Fair value hedge [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 21,591,000,000 19,410,000,000
Fair value hedge [Member] | Hedge of funding [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 9,124,000,000 12,157,000,000
Hedge instruments, fair value adjustments 43,000,000 (114,000,000)
Hedge instruments, Book Value 9,124,000,000 12,157,000,000
Fair value hedge [Member] | Hedge of loan operations [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 7,066,000,000 5,977,000,000
Hedge instruments, fair value adjustments (54,000,000) 52,000,000
Hedge instruments, Book Value 7,066,000,000 5,977,000,000
Fair value hedge [Member] | Hedge of syndicated loan [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value   794,000,000
Hedge instruments, Book Value   794,000,000
Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 92,408,000,000 141,468,000,000
Cash flow hedges [member] | Hedge of funding [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 3,105,000,000 6,444,000,000
Hedge instruments, fair value adjustments 82,000,000 (16,000,000)
Hedge instruments, Book Value 3,200,000,000 6,444,000,000
Cash flow hedges [member] | Hedge of loan operations [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 268,000,000 1,124,000,000
Hedge instruments, fair value adjustments 7,000,000 14,000,000
Hedge instruments, Book Value R$ 274,000,000 R$ 1,124,000,000