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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]    
Beginning balance R$ 19,329 R$ 19,383
Ending balance 19,719 19,329
Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 26,129 24,699
Acquisitions 2,691 1,381
Rescissions / derecognition (253) (738)
Exchange variation (341) 808
Other 36 (21)
Ending balance 28,262 26,129
Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (6,232) (4,919)
Rescissions / derecognition 188 703
Exchange variation 27 (277)
Other (86) 38
Ending balance (8,002) (6,232)
Amortization expense (1,899) (1,777)
Impairment [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (568) (397)
Rescissions / derecognition 58  
Exchange variation   (4)
Ending balance (541) (568)
Incresase (31) (167)
Goodwill and intangible assets from acquisition [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 11,438  
Ending balance 11,158 11,438
Goodwill and intangible assets from acquisition [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 11,464 11,162
Acquisitions   8
Rescissions / derecognition (26)  
Exchange variation (285) 560
Other 5 (266)
Ending balance 11,158 11,464
Goodwill and intangible assets from acquisition [member] | Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (26) (23)
Rescissions / derecognition R$ 26  
Other   (3)
Ending balance   R$ (26)
Association for the promotion and offer of financial products and services [Member]    
Disclosure of detailed information about intangible assets [line items]    
Annual amortization rates 8.00% 8.00%
Beginning balance R$ 1,662  
Ending balance 1,461 R$ 1,662
Association for the promotion and offer of financial products and services [Member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 2,529 2,452
Acquisitions   1
Rescissions / derecognition (4) (27)
Exchange variation 22 47
Other (29) 56
Ending balance 2,518 2,529
Association for the promotion and offer of financial products and services [Member] | Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (867) (647)
Rescissions / derecognition 4 27
Exchange variation (5) (141)
Other 29 117
Ending balance (1,057) (867)
Amortization expense R$ (218) R$ (223)
Software acquired [Member]    
Disclosure of detailed information about intangible assets [line items]    
Annual amortization rates 20.00% 20.00%
Beginning balance R$ 2,521  
Ending balance 2,522 R$ 2,521
Software acquired [Member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 5,247 4,571
Acquisitions 789 646
Rescissions / derecognition (93) (312)
Exchange variation (84) 205
Other 40 137
Ending balance 5,899 5,247
Software acquired [Member] | Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (2,501) (1,998)
Rescissions / derecognition 28 312
Exchange variation 45 (152)
Other (103) (67)
Ending balance (3,206) (2,501)
Amortization expense (675) (596)
Software acquired [Member] | Impairment [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (225) (54)
Rescissions / derecognition 58  
Exchange variation   (4)
Ending balance (171) (225)
Incresase R$ (4) R$ (167)
Internally developed software [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual amortization rates 20.00% 20.00%
Beginning balance R$ 2,363  
Ending balance 2,849 R$ 2,363
Internally developed software [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 4,529 4,353
Acquisitions 1,187 318
Rescissions / derecognition   (189)
Other   47
Ending balance 5,716 4,529
Internally developed software [member] | Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,823) (1,267)
Rescissions / derecognition   154
Other   (13)
Ending balance (2,497) (1,823)
Amortization expense (674) (697)
Internally developed software [member] | Impairment [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (343) (343)
Ending balance (370) (343)
Incresase (27)  
Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,345  
Ending balance R$ 1,729 R$ 1,345
Other intangible assets [member] | Bottom of range [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual amortization rates 10.00% 10.00%
Other intangible assets [member] | Top of range [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual amortization rates 20.00% 20.00%
Other intangible assets [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance R$ 2,360 R$ 2,161
Acquisitions 715 408
Rescissions / derecognition (130) (210)
Exchange variation 6 (4)
Other 20 5
Ending balance 2,971 2,360
Other intangible assets [member] | Depreciation and Amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,015) (984)
Rescissions / derecognition 130 210
Exchange variation (13) 16
Other (12) 4
Ending balance (1,242) (1,015)
Amortization expense R$ (332) R$ (261)