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RISK MANAGEMENT - Loss allowance roll forward (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance $ (274,682,875)    
Ending balance (280,746,878) $ (274,682,875)  
Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 9,694,456    
Ending balance 10,521,501 9,694,456  
Loan commitments and financial guarantee contracts [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 64,910 62,041 $ 67,393
Net remeasurement of loss allowance (14,682) (10,901) (30,303)
New financial assets originated or purchased / Provision charged to profit or loss 20,360 18,989 21,006
FX and other movements (320) 203 (263)
Discontinued operations   (241) 3,840
Reclassification BAC     368
Loss of control in subsidiary   (5,181)  
Ending balance 70,268 64,910 62,041
Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 185,301 165,159 139,155
Net remeasurement of loss allowance 51,513 57,873 46,758
FX and other movements (5,523) 3,165 1,532
Write-offs (45,009) (40,896) (22,286)
Ending balance 186,282 185,301 165,159
Other accounts receivable, simplified approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 197,115    
Ending balance 199,382 197,115  
Investment securities at fair value [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (23,939,915)    
Ending balance (24,446,014) (23,939,915)  
Financial assets at amortised cost, category [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (235,373,468)    
Ending balance (236,970,165) (235,373,468)  
Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 9,616,860    
Ending balance 10,438,261 9,616,860  
Financial assets at amortised cost, category [member] | Loan portfolio [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (179,115,847)    
Ending balance (176,168,055) (179,115,847)  
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 9,197,514 11,275,612 10,905,171
Net remeasurement of loss allowance 4,427,828 2,914,860 2,647,266
New financial assets originated or purchased / Provision charged to profit or loss 1,811,243 1,813,566 1,711,715
Financial assets that have been derecognized/paid (1,513,661) (1,627,591) (1,187,221)
Sales of portfolio (361,380)    
Unwind of discount 724,748 550,963 440,452
FX and other movements (74,078) 58,228 29,152
Discontinued operations   264,457 1,299,102
Reclassification BAC     (1,023,954)
Loss of control in subsidiary   (2,840,666)  
Write-offs (4,176,499) (3,211,915) (3,546,071)
Ending balance 10,035,715 9,197,514 11,275,612
Financial assets at amortised cost, category [member] | Loans to corporate entities [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (105,248,652)    
Ending balance (102,145,802) (105,248,652)  
Financial assets at amortised cost, category [member] | Loans to corporate entities [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 5,494,190    
Ending balance 5,294,622 5,494,190  
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (99,282,353)    
Ending balance (101,753,217) (99,282,353)  
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 5,492,746 5,854,745 5,280,406
Net remeasurement of loss allowance 430,804 812,957 1,051,898
New financial assets originated or purchased / Provision charged to profit or loss 536,713 847,463 821,919
Financial assets that have been derecognized/paid (764,456) (1,037,637) (649,277)
Sales of portfolio (194,305)    
Unwind of discount 517,529 405,104 291,393
FX and other movements (56,438) 42,314 14,846
Discontinued operations   12,985 243,642
Reclassification BAC     (114,667)
Loss of control in subsidiary   (699,022)  
Write-offs (667,993) (746,163) (1,085,415)
Ending balance 5,294,600 5,492,746 5,854,745
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (5,966,299)    
Ending balance (392,585) (5,966,299)  
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,444 2,386 851
Net remeasurement of loss allowance (120) 3 (2,142)
New financial assets originated or purchased / Provision charged to profit or loss 1,787 17,244 5,670
Financial assets that have been derecognized/paid (3,089) (18,189) (1,993)
Ending balance 22 1,444 2,386
Financial assets at amortised cost, category [member] | Loans to consumers [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (56,107,532)    
Ending balance (55,692,165) (56,107,532)  
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 3,311,912 4,581,004 4,938,971
Net remeasurement of loss allowance 3,940,100 2,108,727 1,470,872
New financial assets originated or purchased / Provision charged to profit or loss 1,194,022 916,213 847,198
Financial assets that have been derecognized/paid (708,108) (526,241) (489,670)
Sales of portfolio (167,075)    
Unwind of discount 183,203 119,722 121,699
FX and other movements (13,364) 9,987 9,526
Discontinued operations   245,750  
Entity deconsolidation     (919,065)
Reclassification BAC     985,045
Loss of control in subsidiary   (1,800,012)  
Write-offs (3,433,244) (2,343,238) (2,383,572)
Ending balance 4,307,446 3,311,912 4,581,004
Financial assets at amortised cost, category [member] | Mortgage [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (17,530,914)    
Ending balance (18,106,219) (17,530,914)  
Financial assets at amortised cost, category [member] | Mortgage [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 352,441 732,407 560,904
Net remeasurement of loss allowance 27,511 (10,177) 110,685
New financial assets originated or purchased / Provision charged to profit or loss 73,923 26,952 26,629
Financial assets that have been derecognized/paid (35,578) (41,977) (37,553)
Unwind of discount 17,000 17,085 13,945
FX and other movements (4,276) 5,927 4,780
Discontinued operations   5,722 70,415
Reclassification BAC     9,778
Loss of control in subsidiary   (341,632)  
Write-offs (51,034) (41,866) (27,176)
Ending balance 379,987 352,441 732,407
Financial assets at amortised cost, category [member] | Microcredit [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (228,749)    
Ending balance (223,869) (228,749)  
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 38,971 105,070 124,039
Net remeasurement of loss allowance 29,533 3,350 15,953
New financial assets originated or purchased / Provision charged to profit or loss 4,798 5,694 10,299
Financial assets that have been derecognized/paid (2,430) (3,547) (8,728)
Unwind of discount 7,016 9,052 13,415
Write-offs (24,228) (80,648) (49,908)
Ending balance 53,660 38,971 105,070
Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 382,416    
Ending balance 385,664 382,416  
Financial assets at amortised cost, category [member] | Other accounts receivable, simplified approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 197,115    
Ending balance 199,382 197,115  
Financial assets measured at fair value through other comprehensive income, category [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (22,461,805)    
Ending balance (23,326,776) (22,461,805)  
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 36,930 10,698 7,195
Net remeasurement of loss allowance (15,311) 20,308 1,626
New financial assets originated or purchased / Provision charged to profit or loss 2,669 2,198 3,622
Financial assets that have been derecognized/paid (1,466) 2,105 (1,622)
FX and other movements (5,940) 6,419 1,381
Discontinued operations   (85) (1,082)
Reclassification BAC     (422)
Loss of control in subsidiary   (503)  
Ending balance 16,882 36,930 10,698
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (22,461,805)    
Ending balance (23,326,776) (22,461,805)  
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 12,686 123,978 96,486
Net remeasurement of loss allowance (892) (3,217) (1,829)
New financial assets originated or purchased / Provision charged to profit or loss 6,470 4,409 7,809
Financial assets that have been derecognized/paid (4,342) (4,870) (8,946)
FX and other movements (950) 809 1,114
Discontinued operations   2,935 16,641
Reclassification BAC     12,703
Loss of control in subsidiary   (111,358)  
Ending balance 12,972 12,686 123,978
12-month expected credit losses [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,619,273    
Ending balance 1,924,795 1,619,273  
12-month expected credit losses [member] | Loan commitments and financial guarantee contracts [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 58,160 45,916 57,226
Transfer from stage 1 to stage 2 (1,690) (558) (1,260)
Transfer from stage 1 to stage 3 (218) (57) (132)
Transfer from stage 2 to stage 1 1,105 3,379 4,585
Transfer from stage 3 to stage 1 29 289 84
Net remeasurement of loss allowance (14,124) (7,419) (26,378)
New financial assets originated or purchased / Provision charged to profit or loss 18,693 17,204 12,057
FX and other movements (318) 202 (264)
Discontinued operations   (45) (290)
Reclassification BAC     288
Loss of control in subsidiary   (751)  
Ending balance 61,637 58,160 45,916
12-month expected credit losses [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 24,977 18,939 18,136
Net remeasurement of loss allowance 4,389 7,680 2,378
FX and other movements (1,789) 1,748 (49)
Write-offs (1,612) (3,390) (1,526)
Ending balance 25,965 24,977 18,939
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,548,427    
Ending balance 1,850,186 1,548,427  
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,494,887 1,824,446 1,760,076
Transfer from stage 1 to stage 2 (332,307) (183,333) (202,725)
Transfer from stage 1 to stage 3 (450,063) (105,447) (61,953)
Transfer from stage 2 to stage 1 479,360 377,758 207,626
Transfer from stage 3 to stage 1 113,974 98,057 45,635
Net remeasurement of loss allowance 327,913 (184,532) (529,125)
New financial assets originated or purchased / Provision charged to profit or loss 809,886 902,226 926,752
Financial assets that have been derecognized/paid (501,840) (462,600) (441,892)
Sales of portfolio (2,369)    
Unwind of discount 12    
FX and other movements (13,826) 3,449 5,140
Discontinued operations   (3,843) (274,758)
Reclassification BAC     461,534
Loss of control in subsidiary   (640,049)  
Write-offs (114,019) (131,245) (71,864)
Ending balance 1,811,608 1,494,887 1,824,446
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 598,538 655,655 656,830
Transfer from stage 1 to stage 2 (44,743) (33,511) (46,649)
Transfer from stage 1 to stage 3 (18,381) (33,401) (8,714)
Transfer from stage 2 to stage 1 150,216 93,285 64,201
Transfer from stage 3 to stage 1 31,836 26,793 20,081
Net remeasurement of loss allowance (148,865) (124,267) (274,271)
New financial assets originated or purchased / Provision charged to profit or loss 320,101 392,719 403,839
Financial assets that have been derecognized/paid (262,000) (213,019) (196,873)
FX and other movements (10,958) 10,954 5,283
Discontinued operations   12,101 (22,433)
Reclassification BAC     58,788
Loss of control in subsidiary   (185,786)  
Write-offs (3,303) (2,985) (4,427)
Ending balance 612,441 598,538 655,655
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,444 2,386 792
Transfer from stage 2 to stage 1 2    
Net remeasurement of loss allowance (122) 3 (2,142)
New financial assets originated or purchased / Provision charged to profit or loss 1,787 17,244 5,670
Financial assets that have been derecognized/paid (3,089) (18,189) (1,934)
Ending balance 22 1,444 2,386
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 839,904 1,066,543 1,013,071
Transfer from stage 1 to stage 2 (276,858) (142,762) (144,734)
Transfer from stage 1 to stage 3 (429,739) (70,964) (51,891)
Transfer from stage 2 to stage 1 300,775 211,028 126,680
Transfer from stage 3 to stage 1 71,599 55,658 18,283
Net remeasurement of loss allowance 484,735 (1,000) (233,642)
New financial assets originated or purchased / Provision charged to profit or loss 473,697 473,946 493,695
Financial assets that have been derecognized/paid (214,602) (201,480) (223,040)
Sales of portfolio (2,369)    
FX and other movements (3,200) (2,575) (27)
Discontinued operations   (9,751)  
Entity deconsolidation     345,830
Reclassification BAC     (212,651)
Loss of control in subsidiary   (412,745)  
Write-offs (101,945) (125,994) (65,031)
Ending balance 1,141,997 839,904 1,066,543
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 48,763 93,122 72,294
Transfer from stage 1 to stage 2 (7,295) (4,775) (5,944)
Transfer from stage 1 to stage 3 (635) (266) (322)
Transfer from stage 2 to stage 1 26,638 70,544 14,441
Transfer from stage 3 to stage 1 10,329 15,267 6,819
Net remeasurement of loss allowance (14,157) (55,643) (7,201)
New financial assets originated or purchased / Provision charged to profit or loss 9,654 12,837 13,900
Financial assets that have been derecognized/paid (20,196) (27,664) (15,995)
Unwind of discount 12    
FX and other movements 332 (4,930) (116)
Discontinued operations   (6,193) (39,674)
Reclassification BAC     56,916
Loss of control in subsidiary   (41,518)  
Write-offs (8,365) (2,018) (1,996)
Ending balance 45,080 48,763 93,122
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 6,238 6,740 17,089
Transfer from stage 1 to stage 2 (3,411) (2,285) (5,398)
Transfer from stage 1 to stage 3 (1,308) (816) (1,026)
Transfer from stage 2 to stage 1 1,729 2,901 2,304
Transfer from stage 3 to stage 1 210 339 452
Net remeasurement of loss allowance 6,322 (3,625) (11,869)
New financial assets originated or purchased / Provision charged to profit or loss 4,647 5,480 9,648
Financial assets that have been derecognized/paid (1,953) (2,248) (4,050)
Write-offs (406) (248) (410)
Ending balance 12,068 6,238 6,740
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 24,977    
Ending balance 25,965 24,977  
12-month expected credit losses [member] | Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 28,563 3,297 7,188
Transfer from stage 1 to stage 2     (1,796)
Transfer from stage 2 to stage 1 1,485    
Net remeasurement of loss allowance (14,315) 19,761 (2,443)
New financial assets originated or purchased / Provision charged to profit or loss 2,669 2,198 2,179
Financial assets that have been derecognized/paid (1,466) 1,015 (1,622)
FX and other movements (4,323) 4,910 1,295
Discontinued operations   (85) (1,087)
Reclassification BAC     (417)
Loss of control in subsidiary   (503)  
Ending balance 12,613 28,563 3,297
12-month expected credit losses [member] | Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (22,461,805)    
Ending balance (23,326,776) (22,461,805)  
12-month expected credit losses [member] | Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 12,686 123,978 96,307
Net remeasurement of loss allowance (892) (3,217) (1,829)
New financial assets originated or purchased / Provision charged to profit or loss 6,470 4,409 7,809
Financial assets that have been derecognized/paid (4,342) (4,870) (8,948)
FX and other movements (950) 809 1,116
Discontinued operations   2,935 16,821
Reclassification BAC     12,702
Loss of control in subsidiary   (111,358)  
Ending balance 12,972 12,686 123,978
Lifetime expected credit losses [member] | Other accounts receivable, simplified approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 197,115 217,643 203,902
Discontinued operations   469 8,659
Entity deconsolidation (3,245)    
Provision charged to profit or loss 39,750 27,519 30,039
Reclassification BAC     (1,157)
Loss of control in subsidiary   (33,024)  
Entity liquidation   (1,592)  
Recovery for partial payments from the clients (14,599) (6,751) (5,157)
Write-offs (18,516) (7,948) (25,951)
Exchange gains (losses) in foreign currency (1,123) 799 7,308
Ending balance 199,382 197,115 217,643
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,460,951    
Ending balance 1,315,930 1,460,951  
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Loan commitments and financial guarantee contracts [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 6,461 10,097 8,679
Transfer from stage 1 to stage 2 1,690 558 1,260
Transfer from stage 2 to stage 3 (329) (211) (169)
Transfer from stage 3 to stage 2 4 34 36
Transfer from stage 2 to stage 1 (1,105) (3,379) (4,585)
Net remeasurement of loss allowance (769) (2,264) 830
New financial assets originated or purchased / Provision charged to profit or loss 1,732 1,826 4,025
FX and other movements (2) 1  
Discontinued operations   (63) (8)
Reclassification BAC     29
Loss of control in subsidiary   (138)  
Ending balance 7,682 6,461 10,097
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 20,201 16,771 13,548
Net remeasurement of loss allowance 257 2,190 2,865
FX and other movements (1,270) 1,240 358
Ending balance 19,188 20,201 16,771
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,454,490    
Ending balance 1,308,248 1,454,490  
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,425,922 2,703,117 3,039,056
Transfer from stage 1 to stage 2 332,307 183,333 202,725
Transfer from stage 2 to stage 3 (1,180,705) (625,769) (811,072)
Transfer from stage 3 to stage 2 309,622 165,584 151,978
Transfer from stage 2 to stage 1 (479,360) (377,758) (207,626)
Net remeasurement of loss allowance 1,284,696 695,126 560,032
New financial assets originated or purchased / Provision charged to profit or loss 307,919 316,329 274,290
Financial assets that have been derecognized/paid (157,015) (269,020) (335,489)
Sales of portfolio (1,809)    
Unwind of discount 62 28 1
FX and other movements (16,568) 28,302 14,524
Discontinued operations   14,798 583,619
Reclassification BAC     (570,239)
Loss of control in subsidiary   (1,003,291)  
Write-offs (540,280) (404,857) (198,682)
Ending balance 1,284,791 1,425,922 2,703,117
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 515,202 1,006,822 805,097
Transfer from stage 1 to stage 2 44,743 33,511 46,649
Transfer from stage 2 to stage 3 (130,514) (88,123) (210,321)
Transfer from stage 3 to stage 2 40,868 61,402 48,748
Transfer from stage 2 to stage 1 (150,216) (93,285) (64,201)
Net remeasurement of loss allowance (99,159) (192,441) 275,616
New financial assets originated or purchased / Provision charged to profit or loss 61,148 137,383 137,181
Financial assets that have been derecognized/paid (51,476) (109,718) (105,018)
Unwind of discount 16 14  
FX and other movements (9,657) 9,586 3,020
Discontinued operations   (2,612) 99,910
Reclassification BAC     (24,946)
Loss of control in subsidiary   (244,715)  
Write-offs (2,131) (2,622) (4,913)
Ending balance 218,824 515,202 1,006,822
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Transfer from stage 2 to stage 1 (2)    
Net remeasurement of loss allowance 2    
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 853,159 1,396,101 1,948,030
Transfer from stage 1 to stage 2 276,858 142,762 144,734
Transfer from stage 2 to stage 3 (1,004,192) (498,736) (545,940)
Transfer from stage 3 to stage 2 257,854 92,189 89,458
Transfer from stage 2 to stage 1 (300,775) (211,028) (126,680)
Net remeasurement of loss allowance 1,310,059 863,809 222,504
New financial assets originated or purchased / Provision charged to profit or loss 238,963 174,616 131,386
Financial assets that have been derecognized/paid (98,788) (149,438) (211,872)
Sales of portfolio (1,809)    
Unwind of discount 46 13  
FX and other movements (4,786) 9,007 6,989
Discontinued operations   15,493  
Entity deconsolidation     (528,905)
Reclassification BAC     450,272
Loss of control in subsidiary   (585,225)  
Write-offs (533,321) (396,404) (183,875)
Ending balance 993,268 853,159 1,396,101
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 52,639 286,903 225,889
Transfer from stage 1 to stage 2 7,295 4,775 5,944
Transfer from stage 2 to stage 3 (35,387) (28,228) (26,501)
Transfer from stage 3 to stage 2 9,526 10,553 10,387
Transfer from stage 2 to stage 1 (26,638) (70,544) (14,441)
Net remeasurement of loss allowance 63,399 19,536 80,638
New financial assets originated or purchased / Provision charged to profit or loss 7,711 4,133 5,093
Financial assets that have been derecognized/paid (6,486) (8,938) (14,577)
Unwind of discount   1 1
FX and other movements (2,125) 9,709 4,515
Discontinued operations   1,917 33,437
Reclassification BAC     (16,388)
Loss of control in subsidiary   (173,351)  
Write-offs (3,601) (3,827) (7,094)
Ending balance 66,333 52,639 286,903
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 4,922 13,291 60,040
Transfer from stage 1 to stage 2 3,411 2,285 5,398
Transfer from stage 2 to stage 3 (10,612) (10,682) (28,310)
Transfer from stage 3 to stage 2 1,374 1,440 3,385
Transfer from stage 2 to stage 1 (1,729) (2,901) (2,304)
Net remeasurement of loss allowance 10,395 4,222 (18,726)
New financial assets originated or purchased / Provision charged to profit or loss 97 197 630
Financial assets that have been derecognized/paid (265) (926) (4,022)
Write-offs (1,227) (2,004) (2,800)
Ending balance 6,366 4,922 13,291
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 20,201    
Ending balance 19,188 20,201  
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 8,367 7,401 7
Transfer from stage 1 to stage 2     1,796
Transfer from stage 2 to stage 1 (1,485)    
Net remeasurement of loss allowance (996) 547 4,069
New financial assets originated or purchased / Provision charged to profit or loss     1,443
Financial assets that have been derecognized/paid   1,090  
FX and other movements (1,617) 1,509 86
Discontinued operations     5
Reclassification BAC     (5)
Ending balance 4,269 8,367 7,401
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance     179
Financial assets that have been derecognized/paid     2
FX and other movements     (2)
Discontinued operations     (180)
Reclassification BAC     1
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 6,417,117    
Ending balance 7,081,394 6,417,117  
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Loan commitments and financial guarantee contracts [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 289 6,028 1,488
Transfer from stage 1 to stage 3 218 57 132
Transfer from stage 2 to stage 3 329 211 169
Transfer from stage 3 to stage 2 (4) (34) (36)
Transfer from stage 3 to stage 1 (29) (289) (84)
Net remeasurement of loss allowance 211 (1,218) (4,755)
New financial assets originated or purchased / Provision charged to profit or loss (65) (41) 4,924
FX and other movements     1
Discontinued operations   (133) 4,138
Reclassification BAC     51
Loss of control in subsidiary   (4,292)  
Ending balance 949 289 6,028
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 140,123 129,449 107,471
Net remeasurement of loss allowance 46,867 48,003 41,515
FX and other movements (2,464) 177 1,223
Write-offs (43,397) (37,506) (20,760)
Ending balance 141,129 140,123 129,449
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 6,416,828    
Ending balance 7,080,445 6,416,828  
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 6,276,705 6,748,049 6,106,039
Transfer from stage 1 to stage 3 450,063 105,447 61,953
Transfer from stage 2 to stage 3 1,180,705 625,769 811,072
Transfer from stage 3 to stage 2 (309,622) (165,584) (151,978)
Transfer from stage 3 to stage 1 (113,974) (98,057) (45,635)
Net remeasurement of loss allowance 2,815,219 2,404,266 2,616,359
New financial assets originated or purchased / Provision charged to profit or loss 693,438 595,011 510,673
Financial assets that have been derecognized/paid (854,806) (895,971) (409,840)
Sales of portfolio (357,202)    
Unwind of discount 724,674 550,935 440,451
FX and other movements (43,684) 26,477 9,488
Discontinued operations   253,502 990,241
Reclassification BAC     (915,249)
Loss of control in subsidiary   (1,197,326)  
Write-offs (3,522,200) (2,675,813) (3,275,525)
Ending balance 6,939,316 6,276,705 6,748,049
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 4,379,006 4,192,268 3,818,479
Transfer from stage 1 to stage 3 18,381 33,401 8,714
Transfer from stage 2 to stage 3 130,514 88,123 210,321
Transfer from stage 3 to stage 2 (40,868) (61,402) (48,748)
Transfer from stage 3 to stage 1 (31,836) (26,793) (20,081)
Net remeasurement of loss allowance 678,828 1,129,665 1,050,553
New financial assets originated or purchased / Provision charged to profit or loss 155,464 317,361 280,899
Financial assets that have been derecognized/paid (450,980) (714,900) (347,386)
Sales of portfolio (194,305)    
Unwind of discount 517,513 405,090 291,393
FX and other movements (35,823) 21,774 6,543
Discontinued operations   3,496 166,165
Reclassification BAC     (148,509)
Loss of control in subsidiary   (268,521)  
Write-offs (662,559) (740,556) (1,076,075)
Ending balance 4,463,335 4,379,006 4,192,268
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance     59
Financial assets that have been derecognized/paid     (59)
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 1,618,849 2,118,360 1,977,870
Transfer from stage 1 to stage 3 429,739 70,964 51,891
Transfer from stage 2 to stage 3 1,004,192 498,736 545,940
Transfer from stage 3 to stage 2 (257,854) (92,189) (89,458)
Transfer from stage 3 to stage 1 (71,599) (55,658) (18,283)
Net remeasurement of loss allowance 2,145,306 1,245,918 1,482,010
New financial assets originated or purchased / Provision charged to profit or loss 481,362 267,651 222,117
Financial assets that have been derecognized/paid (394,718) (175,323) (54,758)
Sales of portfolio (162,897)    
Unwind of discount 183,157 119,709 121,699
FX and other movements (5,378) 3,555 2,564
Discontinued operations   240,008  
Entity deconsolidation     (735,990)
Reclassification BAC     747,424
Loss of control in subsidiary   (802,042)  
Write-offs (2,797,978) (1,820,840) (2,134,666)
Ending balance 2,172,181 1,618,849 2,118,360
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 251,039 352,382 262,721
Transfer from stage 1 to stage 3 635 266 322
Transfer from stage 2 to stage 3 35,387 28,228 26,501
Transfer from stage 3 to stage 2 (9,526) (10,553) (10,387)
Transfer from stage 3 to stage 1 (10,329) (15,267) (6,819)
Net remeasurement of loss allowance (21,731) 25,930 37,248
New financial assets originated or purchased / Provision charged to profit or loss 56,558 9,982 7,636
Financial assets that have been derecognized/paid (8,896) (5,375) (6,981)
Unwind of discount 16,988 17,084 13,944
FX and other movements (2,483) 1,148 381
Discontinued operations   9,998 76,652
Reclassification BAC     (30,750)
Loss of control in subsidiary   (126,763)  
Write-offs (39,068) (36,021) (18,086)
Ending balance 268,574 251,039 352,382
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 27,811 85,039 46,910
Transfer from stage 1 to stage 3 1,308 816 1,026
Transfer from stage 2 to stage 3 10,612 10,682 28,310
Transfer from stage 3 to stage 2 (1,374) (1,440) (3,385)
Transfer from stage 3 to stage 1 (210) (339) (452)
Net remeasurement of loss allowance 12,816 2,753 46,548
New financial assets originated or purchased / Provision charged to profit or loss 54 17 21
Financial assets that have been derecognized/paid (212) (373) (656)
Unwind of discount 7,016 9,052 13,415
Write-offs (22,595) (78,396) (46,698)
Ending balance 35,226 27,811 $ 85,039
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance 140,123    
Ending balance $ 141,129 $ 140,123