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Fair Value of Financial Instruments - Summary of Changes in Balance Sheet for Financial Instruments Classified by Level 3 Fair Value Hierarchy (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance R$ (52,149)  
Fair value, Beginning balance 77 R$ 73
Fair value, Ending balance 49,323 52,149
Fair value, Ending balance 286,646 273,536
Fair value, Beginning balance 22,843  
Fair value, Ending balance 23,466 22,843
Fair value, Beginning balance 26,746  
Fair value, Ending balance (27,519) (26,746)
Brazilian government securities [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance (32,926)  
Fair value, Ending balance 27,839 32,926
Fair value, Ending balance 217,058 207,844
Corporate securities [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance (2,681)  
Fair value, Ending balance 2,712 2,681
Fair value, Ending balance 38,448 33,641
Corporate securities [member] | Shares [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance (148)  
Fair value, Ending balance 161 148
Fair value, Ending balance 9,446 5,959
Corporate securities [member] | Securitized real estate loans [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Ending balance 1,411 1,795
Corporate securities [member] | Debentures [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance (1)  
Fair value, Ending balance 2 1
Fair value, Ending balance 4,960 3,216
Corporate securities [member] | Eurobonds and others [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance (1,847)  
Fair value, Ending balance 1,496 1,847
Fair value, Ending balance 1,396 688
Corporate securities [member] | Other [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Ending balance 107 87
Corporate securities [member] | Financial credit bills [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Ending balance 19,724 21,170
Level 3 [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 3,947  
Fair value, Beginning balance   227
Fair value, Beginning balance   3,808
Total gains or losses (realized / unrealized), Recognized in the result   0
Total gains or losses (realized / unrealized), Recognized in the result   (232)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   200
Purchases   578
Settlements   (427)
Settlements   (146)
Transfers in and / or out of Level   0
Transfers in and / or out of Level   (61)
Fair value, Ending balance   3,947
Total gains or losses (realized / unrealized),Recognized in the result (377) (412)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0 0
Purchases 90  
Settlements (353)  
Transfers in and / or out of Level (474)  
Fair value, Ending balance 2,833 3,947
Total Gains or Losses (Unrealized) (618)  
Fair value, Beginning balance 436 521
Total gains or losses (realized / unrealized), Recognized in the result (3) (33)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   101
Purchases 205  
Settlements (254) (244)
Transfers in and / or out of Level (242) 91
Fair value, Ending balance 142 436
Total Gains or Losses (Unrealized) 61 17
Fair value, Beginning balance 103 (60)
Total gains or losses (realized / unrealized), Recognized in the result 40 117
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   (15)
Purchases (148)  
Settlements (141) 111
Transfers in and / or out of Level 44 22
Fair value, Ending balance (26) (103)
Total Gains or Losses (Unrealized) 6 (57)
Level 3 [Member] | Swap [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 369 468
Total gains or losses (realized / unrealized), Recognized in the result (5) (41)
Settlements (30) (100)
Transfers in and / or out of Level (244) 42
Fair value, Ending balance 90 369
Total Gains or Losses (Unrealized) 61 32
Fair value, Beginning balance 102 (56)
Total gains or losses (realized / unrealized), Recognized in the result (37) 122
Settlements (92) 97
Transfers in and / or out of Level 44 21
Fair value, Ending balance (3) (102)
Total Gains or Losses (Unrealized) (3) (60)
Level 3 [Member] | Other derivative financial instruments [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 1 6
Total gains or losses (realized / unrealized), Recognized in the result   (4)
Settlements (1) (1)
Fair value, Ending balance   1
Total Gains or Losses (Unrealized)   (1)
Fair value, Beginning balance 1  
Total gains or losses (realized / unrealized), Recognized in the result 77  
Purchases (148)  
Settlements (49)  
Fair value, Ending balance (23) (1)
Total Gains or Losses (Unrealized) 9  
Level 3 [Member] | Options [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 66 47
Total gains or losses (realized / unrealized), Recognized in the result 2 12
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   101
Purchases 205  
Settlements (223) (143)
Transfers in and / or out of Level 2 49
Fair value, Ending balance 52 66
Total Gains or Losses (Unrealized)   (14)
Fair value, Beginning balance 1 (4)
Total gains or losses (realized / unrealized), Recognized in the result   (5)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   (15)
Settlements   13
Fair value, Ending balance   (1)
Total Gains or Losses (Unrealized)   3
Level 3 [Member] | Credit derivatives financial institutions [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Settlements   1
Transfers in and / or out of Level   1
Level 3 [Member] | Brazilian government securities [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 1  
Fair value, Beginning balance   1
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Fair value, Ending balance   1
Total gains or losses (realized / unrealized),Recognized in the result (1) (1)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0  
Fair value, Ending balance   1
Level 3 [Member] | Corporate securities [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 3,946  
Fair value, Beginning balance   227
Fair value, Beginning balance   3,807
Total gains or losses (realized / unrealized), Recognized in the result   0
Total gains or losses (realized / unrealized), Recognized in the result   (232)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   200
Purchases   578
Settlements   (427)
Settlements   (146)
Transfers in and / or out of Level   0
Transfers in and / or out of Level   (61)
Fair value, Ending balance 2,833 3,946
Total gains or losses (realized / unrealized),Recognized in the result (376) (411)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0 0
Purchases 90  
Settlements (353)  
Transfers in and / or out of Level (474)  
Fair value, Ending balance 2,833 3,946
Total Gains or Losses (Unrealized) (618)  
Level 3 [Member] | Corporate securities [member] | Shares [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 2,019  
Fair value, Beginning balance   1,662
Total gains or losses (realized / unrealized), Recognized in the result   122
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   400
Transfers in and / or out of Level   (165)
Fair value, Ending balance 1,268 2,019
Total gains or losses (realized / unrealized),Recognized in the result 34 (274)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0  
Settlements (203)  
Transfers in and / or out of Level (582)  
Fair value, Ending balance 1,268 2,019
Total Gains or Losses (Unrealized) (442)  
Level 3 [Member] | Corporate securities [member] | Securitized real estate loans [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 1,795  
Fair value, Beginning balance   6
Fair value, Beginning balance   2,092
Total gains or losses (realized / unrealized), Recognized in the result   0
Total gains or losses (realized / unrealized), Recognized in the result   (355)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   58
Settlements   (6)
Transfers in and / or out of Level   0
Fair value, Ending balance 1,411 1,795
Total gains or losses (realized / unrealized),Recognized in the result (359) 16
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0 0
Purchases 57  
Settlements (89)  
Transfers in and / or out of Level 7  
Fair value, Ending balance 1,411 1,795
Total Gains or Losses (Unrealized) 19  
Level 3 [Member] | Corporate securities [member] | Debentures [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 122  
Fair value, Beginning balance   37
Total gains or losses (realized / unrealized), Recognized in the result   (1)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   106
Settlements   (124)
Transfers in and / or out of Level   104
Fair value, Ending balance 85 122
Total gains or losses (realized / unrealized),Recognized in the result (41) (153)
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0  
Settlements (53)  
Transfers in and / or out of Level 57  
Fair value, Ending balance 85 122
Total Gains or Losses (Unrealized) (196)  
Level 3 [Member] | Corporate securities [member] | Eurobonds and others [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance   221
Total gains or losses (realized / unrealized), Recognized in the result   0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   200
Purchases   9
Settlements   (421)
Settlements   (9)
Transfers in and / or out of Level   0
Fair value, Ending balance 31  
Total gains or losses (realized / unrealized),Recognized in the result 2  
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0 0
Purchases 20  
Settlements (2)  
Transfers in and / or out of Level 11  
Fair value, Ending balance 31  
Level 3 [Member] | Corporate securities [member] | Other [Member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Beginning balance 10  
Fair value, Beginning balance   16
Total gains or losses (realized / unrealized), Recognized in the result   2
Total gains or losses (realized / unrealized), Recognized in other comprehensive income   0
Purchases   5
Settlements   (13)
Fair value, Ending balance 33 10
Total gains or losses (realized / unrealized),Recognized in the result (12)  
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0  
Purchases 13  
Settlements (6)  
Transfers in and / or out of Level 28  
Fair value, Ending balance 33 R$ 10
Total Gains or Losses (Unrealized) 1  
Level 3 [Member] | Corporate securities [member] | Financial credit bills [member]    
Disclosure Of Fair Value Gains And Losses Of Derivative Financial Instruments [Line Items]    
Fair value, Ending balance 5  
Total gains or losses (realized / unrealized), Recognized in other comprehensive income 0  
Transfers in and / or out of Level 5  
Fair value, Ending balance R$ 5