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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, 2019
Dec. 31, 2018
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost R$ 281,110 R$ 262,232
Accumulated gain / (loss) reflected in income (1,070) (321)
Fair value 280,040 261,911
Investment funds [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 9,277 5,253
Accumulated gain / (loss) reflected in income (1,010) (927)
Fair value 8,267 4,326
Brazilian government securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 218,548 215,956
Accumulated gain / (loss) reflected in income 1,063 1,102
Fair value 219,611 217,058
Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 1,541 2,070
Accumulated gain / (loss) reflected in income (21) 9
Fair value 1,520 2,079
Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 51,744 38,953
Accumulated gain / (loss) reflected in income (1,102) (505)
Fair value 50,642 38,448
Argentina [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 349 1,121
Accumulated gain / (loss) reflected in income (31) 8
Fair value 318 1,129
Chile [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 487 301
Accumulated gain / (loss) reflected in income 1 1
Fair value 488 302
Colombia [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 399 207
Accumulated gain / (loss) reflected in income 10  
Fair value 409 207
United States [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 141 117
Fair value 141 117
Mexico [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 57 120
Fair value 57 120
Paraguay [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 2 1
Fair value 2 1
Peru [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 8  
Fair value 8  
Uruguay [member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 98 84
Accumulated gain / (loss) reflected in income (1)  
Fair value 97 84
ITALY | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost   115
Fair value   115
Other [Member] | Government securities - abroad [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost   4
Fair value   4
Negotiable shares [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 15,459 9,778
Accumulated gain / (loss) reflected in income (822) (332)
Fair value 14,637 9,446
Bank deposit certificates [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 792 969
Fair value 792 969
Real estate receivables certificates [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 1,414 1,391
Accumulated gain / (loss) reflected in income 30 20
Fair value 1,444 1,411
Debentures [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 12,958 5,147
Accumulated gain / (loss) reflected in income (303) (187)
Fair value 12,655 4,960
Eurobonds and others [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 2,178 1,403
Accumulated gain / (loss) reflected in income (5) (7)
Fair value 2,173 1,396
Financial bills [Member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 18,517 19,724
Accumulated gain / (loss) reflected in income (3)  
Fair value 18,514 19,724
Promissory notes [Member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 313 435
Fair value 313 435
Other [member] | Corporate debt securities [member]    
Disclosure of financial assets at fair value through profit or loss [line items]    
Cost 113 106
Accumulated gain / (loss) reflected in income 1 1
Fair value R$ 114 R$ 107