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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 0.00%    
Beginning balance R$ 19,383 R$ 17,056  
Ending balance 19,329 19,383 R$ 17,056
Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 24,699 20,919 11,109
Acquisitions 1,381 2,553 10,552
Terminated agreements / derecognition (738) (368) (420)
Exchange variation 808 1,287 (73)
Other (21) 308 (249)
Ending balance 26,129 24,699 20,919
Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (4,919) (3,455) (2,719)
Terminated agreements / derecognition 703 320 374
Exchange variation (277) 35 73
Other 38 (361) 100
Ending balance (6,232) (4,919) (3,455)
Amortization expense (1,777) (1,458) (1,283)
Impairment [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (397) (408) (38)
Exchange variation (4) 25 3
Ending balance (568) (397) (408)
Increase R$ (167) R$ (14) (375)
Write off     R$ 2
Goodwill and intangible assets from acquisition [member]      
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 20.00% 20.00% 20.00%
Beginning balance R$ 11,139 R$ 9,860  
Ending balance 11,438 11,139 R$ 9,860
Goodwill and intangible assets from acquisition [member] | Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 11,162 9,694 2,081
Acquisitions 8 634 7,706
Terminated agreements / derecognition   (22) (35)
Exchange variation 560 1,305 (58)
Other (266) (449)  
Ending balance 11,464 11,162 9,694
Goodwill and intangible assets from acquisition [member] | Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (23) 166 153
Other (3) (189) 13
Ending balance R$ (26) R$ (23) R$ 166
Association for the promotion and offer of financial products and service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 8.00% 8.00% 8.00%
Beginning balance R$ 1,805 R$ 1,372  
Ending balance 1,662 1,805 R$ 1,372
Association for the promotion and offer of financial products and service [Member] | Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,452 1,748 1,409
Acquisitions 1 18 719
Terminated agreements / derecognition (27) (16) (73)
Exchange variation 47 25 (12)
Other 56 677 (295)
Ending balance 2,529 2,452 1,748
Association for the promotion and offer of financial products and service [Member] | Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (647) (376) (330)
Terminated agreements / derecognition 27 16 67
Exchange variation (141) (17) 84
Other 117 3 66
Ending balance (867) (647) (376)
Amortization expense R$ (223) R$ (273) (263)
Association for the promotion and offer of financial products and service [Member] | Impairment [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance     (2)
Write off     R$ 2
Acquisition of software [Member]      
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 20.00% 20.00% 20.00%
Beginning balance R$ 2,519 R$ 2,085  
Ending balance 2,521 2,519 R$ 2,085
Acquisition of software [Member] | Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,571 3,840 2,362
Acquisitions 646 1,206 1,293
Terminated agreements / derecognition (312)   (3)
Exchange variation 205 (77) 120
Other 137 (398) 68
Ending balance 5,247 4,571 3,840
Acquisition of software [Member] | Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (1,998) (1,701) (1,190)
Terminated agreements / derecognition 312   1
Exchange variation (152) 79 (107)
Other (67) 119 24
Ending balance (2,501) (1,998) (1,701)
Amortization expense (596) (495) (429)
Acquisition of software [Member] | Impairment [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (54) (54)  
Exchange variation (4)   3
Ending balance (225) R$ (54) (54)
Increase R$ (167)   R$ (57)
Internally developed software [member]      
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 20.00% 20.00% 20.00%
Beginning balance R$ 2,743 R$ 2,658  
Ending balance 2,363 2,743 R$ 2,658
Internally developed software [member] | Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,353 3,525 3,311
Acquisitions 318 350 215
Terminated agreements / derecognition (189) (1) (1)
Other 47 479  
Ending balance 4,529 4,353 3,525
Internally developed software [member] | Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (1,267) (532) (252)
Terminated agreements / derecognition 154 (6)  
Other (13) (283)  
Ending balance (1,823) (1,267) (532)
Amortization expense (697) (446) (280)
Internally developed software [member] | Impairment [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (343) (335) (18)
Exchange variation   6  
Ending balance (343) (343) (335)
Increase   (14) (317)
Other intangible assets [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 1,177 1,081  
Ending balance R$ 1,345 R$ 1,177 R$ 1,081
Other intangible assets [member] | Bottom of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Annual amortization rates 10.00% 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% 20.00%
Other intangible assets [member] | Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance R$ 2,161 R$ 2,112 R$ 1,946
Acquisitions 408 345 619
Terminated agreements / derecognition (210) (329) (308)
Exchange variation (4) 34 (123)
Other 5 (1) (22)
Ending balance 2,360 2,161 2,112
Other intangible assets [member] | Depreciation and Amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance (984) (1,012) (1,100)
Terminated agreements / derecognition 210 310 306
Exchange variation 16 (27) 96
Other 4 (11) (3)
Ending balance (1,015) (984) (1,012)
Amortization expense R$ (261) (244) (311)
Other intangible assets [member] | Impairment [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance   (19) (18)
Exchange variation   R$ 19  
Ending balance     (19)
Increase     R$ (1)