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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, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Opening balance R$ 18,613  
Closing balance 21,454 R$ 18,613
Legal proceedings provision [member]    
Disclosure of other provisions [line items]    
Opening balance 4,426 5,300
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (226) (243)
Subtotal 4,200 5,057
Adjustment / Interest (Note 23) 122 145
Changes in the period reflected in income 726 319
Increase 1,177 774
Reversal (451) (455)
Payment (1,631) (1,321)
Subtotal 3,417 4,200
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 216 226
Closing balance 3,633 4,426
Current 1,662 1,350
Non-current 1,971 3,076
Labor [Member]    
Disclosure of other provisions [line items]    
Opening balance 6,821 7,283
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (957) (998)
Subtotal 5,864 6,285
Adjustment / Interest (Note 23) 1,024 508
Changes in the period reflected in income 3,160 1,982
Increase 3,325 2,152
Reversal (165) (170)
Payment (2,449) (2,911)
Subtotal 7,599 5,864
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 980 957
Closing balance 8,579 6,821
Current 2,451 2,911
Non-current 6,128 3,910
Other [Member]    
Disclosure of other provisions [line items]    
Opening balance 573 150
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) 0  
Subtotal 573 150
Adjustment / Interest (Note 23) 0  
Changes in the period reflected in income 403 423
Increase 435 425
Reversal (32) (2)
Payment 0  
Subtotal 976 573
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 0  
Closing balance 976 573
Current 976 573
Non-current 0  
Civil labor and other provisions [member]    
Disclosure of other provisions [line items]    
Opening balance 11,820 12,733
(-) Provisions guaranteed by indemnity clause (Note 2.4.n) (1,183) (1,241)
Subtotal 10,637 11,492
Adjustment / Interest (Note 23) 1,146 653
Changes in the period reflected in income 4,289 2,724
Increase 4,937 3,351
Reversal (648) (627)
Payment (4,080) (4,232)
Subtotal 11,992 10,637
(+) Provisions guaranteed by indemnity clause (Note 2.4.n) 1,196 1,183
Closing balance 13,188 11,820
Current 5,089 4,834
Non-current R$ 8,099 R$ 6,986