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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$)
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value R$ 116,430,000,000 R$ 126,549,000,000
Hedge instruments, fair value adjustments 5,469,000,000 2,378,000,000
Hedge of deposits and repurchase agreements [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 24,543,000,000 29,727,000,000
Hedge instruments, fair value adjustments (37,000,000) (21,000,000)
Hedge instruments, Book Value 24,543,000,000 29,727,000,000
Hedge of highly probable forecast transactions [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 294,000,000 71,000,000
Hedge instruments, fair value adjustments (11,000,000) 6,000,000
Hedge instruments, Book Value 294,000,000 71,000,000
Hedge of assets transactions [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 5,656,000,000 8,003,000,000
Hedge instruments, fair value adjustments 91,000,000 136,000,000
Hedge instruments, Book Value 5,564,000,000 7,866,000,000
Hedge of asset backed securities under repurchase agreements [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 32,130,000,000 38,013,000,000
Hedge instruments, fair value adjustments 20,000,000 8,000,000
Hedge instruments, Book Value 30,896,000,000 36,668,000,000
Hedge of assets denominated in UF [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 12,582,000,000 13,221,000,000
Hedge instruments, fair value adjustments 5,000,000 23,000,000
Hedge instruments, Book Value 12,588,000,000 13,247,000,000
Hedge of fair value through other comprehensive income [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 4,609,000,000 5,401,000,000
Hedge instruments, fair value adjustments (85,000,000) (82,000,000)
Hedge instruments, Book Value 4,482,000,000 5,391,000,000
Hedges of net investment in foreign operations [member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 16,947,000,000 12,550,000,000
Hedge instruments, fair value adjustments 4,988,000,000 2,230,000,000
Hedge instruments, Book Value 14,396,000,000 14,820,000,000
Fair value hedge [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 19,431,000,000 21,591,000,000
Fair value hedge [Member] | Hedge of funding [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 7,436,000,000 9,124,000,000
Hedge instruments, fair value adjustments 775,000,000 43,000,000
Hedge instruments, Book Value 7,436,000,000 9,124,000,000
Fair value hedge [Member] | Hedge of loan operations [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 7,386,000,000 7,066,000,000
Hedge instruments, fair value adjustments (264,000,000) (54,000,000)
Hedge instruments, Book Value 7,386,000,000 7,066,000,000
Cash flow hedges [member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 80,052,000,000 92,408,000,000
Cash flow hedges [member] | Hedge of funding [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 4,590,000,000 3,105,000,000
Hedge instruments, fair value adjustments (27,000,000) 82,000,000
Hedge instruments, Book Value 4,617,000,000 3,200,000,000
Cash flow hedges [member] | Hedge of loan operations [Member]    
Disclosure of detailed information about hedged items [line items]    
Hedge instruments, Nominal Value 257,000,000 268,000,000
Hedge instruments, fair value adjustments 14,000,000 7,000,000
Hedge instruments, Book Value R$ 269,000,000 R$ 274,000,000