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Contingent Assets and Liabilities, Provisions and Legal Obligations - Summary of Changes in Civil, Labor and Other Risks Provisions (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Opening balance R$ 19,736  
Closing balance 18,613 R$ 19,736
Legal proceedings provision [member]    
Disclosure of other provisions [line items]    
Opening balance 5,300 5,172
Effect of change in consolidation criteria   (1)
(-) Guaranteed Provisions by indemnity clause (243) (256)
Subtotal 5,057 4,954
Interest 145 99
Changes in the period reflected in results 319 1,420
Increase 774 1,962
Reversal (455) (542)
Payment (1,321) (1,416)
Subtotal 4,200 5,057
(+) Guaranteed Provisions by indemnity clause (Note 2.4.n) 226 243
Closing balance 4,426 5,300
Current 1,350 1,450
Non-current 3,076 3,850
Escrow deposits 1,574 1,457
Legal proceedings provision [member] | Corp Banca [Member]    
Disclosure of other provisions [line items]    
Balance arising from the merger with Corpbanca   39
Labor [Member]    
Disclosure of other provisions [line items]    
Opening balance 7,283 7,232
(-) Guaranteed Provisions by indemnity clause (998) (1,066)
Subtotal 6,285 6,450
Interest 508 613
Changes in the period reflected in results 1,982 2,357
Increase 2,152 2,592
Reversal (170) (235)
Payment (2,911) (3,135)
Subtotal 5,864 6,285
(+) Guaranteed Provisions by indemnity clause (Note 2.4.n) 957 998
Closing balance 6,821 7,283
Current 2,911 3,144
Non-current 3,910 4,139
Escrow deposits 2,302 2,200
Labor [Member] | Corp Banca [Member]    
Disclosure of other provisions [line items]    
Balance arising from the merger with Corpbanca   284
Other [Member]    
Disclosure of other provisions [line items]    
Opening balance 150 259
Subtotal 150 259
Changes in the period reflected in results 423 (109)
Increase 425 4
Reversal (2) (113)
Subtotal 573 150
Closing balance 573 150
Current 573 150
Civil labor and other provisions [member]    
Disclosure of other provisions [line items]    
Opening balance 12,733 12,663
Effect of change in consolidation criteria   (1)
(-) Guaranteed Provisions by indemnity clause (1,241) (1,322)
Subtotal 11,492 11,663
Interest 653 712
Changes in the period reflected in results 2,724 3,668
Increase 3,351 4,558
Reversal (627) (890)
Payment (4,232) (4,551)
Subtotal 10,637 11,492
(+) Guaranteed Provisions by indemnity clause (Note 2.4.n) 1,183 1,241
Closing balance 11,820 12,733
Current 4,834 4,744
Non-current 6,986 7,989
Escrow deposits R$ 3,876 3,657
Civil labor and other provisions [member] | Corp Banca [Member]    
Disclosure of other provisions [line items]    
Balance arising from the merger with Corpbanca   R$ 323