XML 163 R111.htm IDEA: XBRL DOCUMENT v3.19.1
Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Reconciliation of Expected Loss for Financial Assets at Fair Value Through Other Comprehensive Instrument-Securities, Segregated by Stages (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial assets at fair value through other comprehensive income [line items]      
Gains / (Losses) R$ 254 R$ 128 R$ 851
Level 1 [Member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (84) (93) (82)
Gains / (Losses) (1)    
Purchases (2) (2) (1)
Settlements 2    
Transfer to stage 2   0 0
Transfer to stage 3   11  
Cure from stage 3     (10)
Expected loss, ending balance (85) (84) (93)
Level 1 [Member] | Brazilian government securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (36) (36) (36)
Transfer to stage 2   0 0
Expected loss, ending balance (36) (36) (36)
Level 1 [Member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (48) (57) (46)
Gains / (Losses) (1)    
Purchases (2) (2) (1)
Settlements 2    
Transfer to stage 2   0 0
Transfer to stage 3   11  
Cure from stage 3     (10)
Expected loss, ending balance (49) (48) (57)
Level 1 [Member] | Other [member] | Brazilian government securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (36) (36) (36)
Transfer to stage 2   0 0
Expected loss, ending balance (36) (36) (36)
Level 1 [Member] | Other [member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (3) (3) (3)
Transfer to stage 2   0 0
Expected loss, ending balance (3) (3) (3)
Level 1 [Member] | Debentures [member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (43) (43) (43)
Transfer to stage 2   0 0
Expected loss, ending balance (43) (43) (43)
Level 1 [Member] | Eurobonds and others [member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance (2) (11)  
Gains / (Losses) (1)    
Purchases (2) (2)  
Settlements 2    
Transfer to stage 2   0  
Transfer to stage 3   11  
Expected loss, ending balance R$ (3) (2) (11)
Level 3 [Member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance     (13)
Settlements   10  
Cure from stage 1   (10)  
Transfer to stage 1     13
Transfer to stage 2   0 0
Level 3 [Member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance     (13)
Settlements   10  
Cure from stage 1   (10)  
Transfer to stage 1     13
Transfer to stage 2   0 0
Level 3 [Member] | Eurobonds and others [member] | Corporate securities [member]      
Financial assets at fair value through other comprehensive income [line items]      
Expected loss, beginning balance     (13)
Settlements   10  
Cure from stage 1   (10)  
Transfer to stage 1     13
Transfer to stage 2   R$ 0 R$ 0