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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - Held-for-trading financial assets [Member] - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount R$ 262,232 R$ 249,286
Accumulated gain / (loss) reflected in income (321) (339)
Fair value 261,911 248,947
Investment funds [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 5,253 4,135
Accumulated gain / (loss) reflected in income (927) (622)
Fair value 4,326 3,513
Brazilian government securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 215,956 207,418
Accumulated gain / (loss) reflected in income 1,102 426
Fair value 217,058 207,844
Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 2,070 3,917
Accumulated gain / (loss) reflected in income 9 32
Fair value 2,079 3,949
Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 38,953 33,816
Accumulated gain / (loss) reflected in income (505) (175)
Fair value 38,448 33,641
Argentina [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 1,121 1,446
Accumulated gain / (loss) reflected in income 8 20
Fair value 1,129 1,466
Chile [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 301 57
Accumulated gain / (loss) reflected in income 1  
Fair value 302 57
Colombia [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 207 2,080
Accumulated gain / (loss) reflected in income   12
Fair value 207 2,092
United States [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 117 100
Fair value 117 100
Mexico [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 120 5
Fair value 120 5
Paraguay [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 1 3
Fair value 1 3
Uruguay [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 84 193
Fair value 84 193
ITALY | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 115  
Fair value 115  
Other [Member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 4 33
Fair value 4 33
Shares [member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 9,778 6,080
Accumulated gain / (loss) reflected in income (332) (121)
Fair value 9,446 5,959
Bank deposit certificates [member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 969 335
Fair value 969 335
Securitized real estate loans [Member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 1,391 1,779
Accumulated gain / (loss) reflected in income 20 16
Fair value 1,411 1,795
Debentures [member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 5,147 3,290
Accumulated gain / (loss) reflected in income (187) (74)
Fair value 4,960 3,216
Eurobonds and others [member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 1,403 684
Accumulated gain / (loss) reflected in income (7) 4
Fair value 1,396 688
Financial bills [Member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 19,724 21,170
Fair value 19,724 21,170
Promissory notes [Member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 435 391
Fair value 435 391
Other [member] | Corporate securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Gross carrying amount 106 87
Accumulated gain / (loss) reflected in income 1  
Fair value R$ 107 R$ 87