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RISK MANAGEMENT - Loss allowance roll forward (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance $ (280,746,878)    
Ending balance (304,853,883) $ (280,746,878)  
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 10,521,501    
Ending balance 10,478,009 10,521,501  
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 70,268 64,910 $ 62,041
Net remeasurement of loss allowance (18,304) (14,682) (10,901)
New financial assets originated or purchased / Provision charged to profit or loss 20,230 20,360 18,989
FX and other movements 220 (320) 203
Discontinued operations     (241)
Loss of control in subsidiary     (5,181)
Ending balance 72,414 70,268 64,910
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 186,282 185,301 165,159
Net remeasurement of loss allowance 66,500 51,513 57,873
FX and other movements 4,301 (5,523) 3,165
Write-offs (86,153) (45,009) (40,896)
Ending balance 170,930 186,282 185,301
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 199,382    
Ending balance 191,041 199,382  
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 (24,446,014)    
Ending balance (28,472,926) (24,446,014)  
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 (236,970,165)    
Ending balance (251,981,889) (236,970,165)  
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 10,438,261    
Ending balance 10,387,285 10,438,261  
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 (176,168,055)    
Ending balance (190,129,486) (176,168,055)  
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated depreciation, amortisation and 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 10,035,715    
Ending balance 10,006,639 10,035,715  
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 10,035,715 9,197,514 11,275,612
Net remeasurement of loss allowance 4,763,709 4,427,828 2,914,860
New financial assets originated or purchased / Provision charged to profit or loss 1,404,199 1,811,243 1,813,566
Financial assets that have been derecognized/paid (1,434,686) (1,513,661) (1,627,591)
Sales of portfolio (134,655) (361,380)  
Unwind of discount 816,088 724,748 550,963
FX and other movements 43,033 (74,078) 58,228
Discontinued operations     264,457
Loss of control in subsidiary     (2,840,666)
Write-offs (5,486,764) (4,176,499) (3,211,915)
Ending balance 10,006,639 10,035,715 9,197,514
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 (102,145,802)    
Ending balance (110,756,010) (102,145,802)  
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 5,294,622    
Ending balance 5,363,688 5,294,622  
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 (101,753,217)    
Ending balance (110,051,750) (101,753,217)  
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 5,294,600 5,492,746 5,854,745
Net remeasurement of loss allowance 988,859 430,804 812,957
New financial assets originated or purchased / Provision charged to profit or loss 474,872 536,713 847,463
Financial assets that have been derecognized/paid (705,366) (764,456) (1,037,637)
Sales of portfolio (94,960) (194,305)  
Unwind of discount 593,569 517,529 405,104
FX and other movements 31,149 (56,438) 42,314
Discontinued operations     12,985
Loss of control in subsidiary     (699,022)
Write-offs (1,219,830) (667,993) (746,163)
Ending balance 5,362,893 5,294,600 5,492,746
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 (392,585)    
Ending balance (704,260) (392,585)  
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 22 1,444 2,386
Net remeasurement of loss allowance 732 (120) 3
New financial assets originated or purchased / Provision charged to profit or loss 99 1,787 17,244
Financial assets that have been derecognized/paid (58) (3,089) (18,189)
Ending balance 795 22 1,444
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 (55,692,165)    
Ending balance (57,810,307) (55,692,165)  
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 4,307,446 3,311,912 4,581,004
Net remeasurement of loss allowance 3,603,485 3,940,100 2,108,727
New financial assets originated or purchased / Provision charged to profit or loss 901,972 1,194,022 916,213
Financial assets that have been derecognized/paid (665,993) (708,108) (526,241)
Sales of portfolio (10,064) (167,075)  
Unwind of discount 199,816 183,203 119,722
FX and other movements 9,043 (13,364) 9,987
Discontinued operations     245,750
Loss of control in subsidiary     (1,800,012)
Write-offs (4,179,687) (3,433,244) (2,343,238)
Ending balance 4,166,018 4,307,446 3,311,912
Financial assets at amortised cost, category [member] | Mortgages [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Beginning balance (18,106,219)    
Ending balance (21,562,412) (18,106,219)  
Financial assets at amortised cost, category [member] | Mortgages [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 379,987 352,441 732,407
Net remeasurement of loss allowance 147,336 27,511 (10,177)
New financial assets originated or purchased / Provision charged to profit or loss 24,541 73,923 26,952
Financial assets that have been derecognized/paid (26,355) (35,578) (41,977)
Unwind of discount 21,019 17,000 17,085
FX and other movements 2,841 (4,276) 5,927
Discontinued operations     5,722
Loss of control in subsidiary     (341,632)
Write-offs (76,054) (51,034) (41,866)
Ending balance 473,315 379,987 352,441
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 (223,869)    
Ending balance (757) (223,869)  
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 53,660 38,971 105,070
Net remeasurement of loss allowance 23,297 29,533 3,350
New financial assets originated or purchased / Provision charged to profit or loss 2,715 4,798 5,694
Financial assets that have been derecognized/paid (36,914) (2,430) (3,547)
Sales of portfolio (29,631)    
Unwind of discount 1,684 7,016 9,052
Write-offs (11,193) (24,228) (80,648)
Ending balance 3,618 53,660 38,971
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 385,664    
Ending balance 361,971 385,664  
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 199,382    
Ending balance 191,041 199,382  
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 (23,326,776)    
Ending balance (27,050,198) (23,326,776)  
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 16,882 36,930 10,698
Net remeasurement of loss allowance (2,336) (15,311) 20,308
New financial assets originated or purchased / Provision charged to profit or loss 3,279 2,669 2,198
Financial assets that have been derecognized/paid (1,366) (1,466) (2,105)
FX and other movements 2,216 (5,940) 6,419
Discontinued operations     (85)
Loss of control in subsidiary     (503)
Ending balance 18,675 16,882 36,930
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 (23,326,776)    
Ending balance (27,050,198) (23,326,776)  
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 12,972 12,686 123,978
Net remeasurement of loss allowance 452 (892) (3,217)
New financial assets originated or purchased / Provision charged to profit or loss 9,029 6,470 4,409
Financial assets that have been derecognized/paid (4,895) (4,342) (4,870)
FX and other movements 752 (950) 809
Discontinued operations     2,935
Loss of control in subsidiary     (111,358)
Ending balance 18,310 12,972 12,686
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 1,924,795    
Ending balance 2,017,308 1,924,795  
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 61,637 58,160 45,916
Transfer from stage 1 to stage 2 (1,233) (1,690) (558)
Transfer from stage 1 to stage 3 (503) (218) (57)
Transfer from stage 2 to stage 1 2,998 1,105 3,379
Transfer from stage 3 to stage 1 20 29 289
Net remeasurement of loss allowance (18,834) (14,124) (7,419)
New financial assets originated or purchased / Provision charged to profit or loss 18,204 18,693 17,204
FX and other movements 220 (318) 202
Discontinued operations     (45)
Loss of control in subsidiary     (751)
Ending balance 62,509 61,637 58,160
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 25,965 24,977 18,939
Net remeasurement of loss allowance 4,932 4,389 7,680
FX and other movements 860 (1,789) 1,748
Write-offs (531) (1,612) (3,390)
Ending balance 31,226 25,965 24,977
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 1,850,186    
Ending balance 1,936,489 1,850,186  
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 1,811,608 1,494,887 1,824,446
Transfer from stage 1 to stage 2 (332,518) (332,307) (183,333)
Transfer from stage 1 to stage 3 (422,672) (450,063) (105,447)
Transfer from stage 2 to stage 1 339,075 479,360 377,758
Transfer from stage 3 to stage 1 112,495 113,974 98,057
Net remeasurement of loss allowance 391,903 327,913 (184,532)
New financial assets originated or purchased / Provision charged to profit or loss 623,901 809,886 902,226
Financial assets that have been derecognized/paid (571,130) (501,840) (462,600)
Sales of portfolio (3,063) (2,369)  
Unwind of discount 1 12  
FX and other movements 9,649 (13,826) 3,449
Discontinued operations     (3,843)
Loss of control in subsidiary     (640,049)
Write-offs (68,315) (114,019) (131,245)
Ending balance 1,890,934 1,811,608 1,494,887
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 612,441 598,538 655,655
Transfer from stage 1 to stage 2 (55,649) (44,743) (33,511)
Transfer from stage 1 to stage 3 (18,703) (18,381) (33,401)
Transfer from stage 2 to stage 1 69,270 150,216 93,285
Transfer from stage 3 to stage 1 25,801 31,836 26,793
Net remeasurement of loss allowance 78,801 (148,865) (124,267)
New financial assets originated or purchased / Provision charged to profit or loss 314,904 320,101 392,719
Financial assets that have been derecognized/paid (304,000) (262,000) (213,019)
Unwind of discount 1    
FX and other movements 5,748 (10,958) 10,954
Discontinued operations     12,101
Loss of control in subsidiary     (185,786)
Write-offs (4,539) (3,303) (2,985)
Ending balance 724,075 612,441 598,538
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 22 1,444 2,386
Transfer from stage 2 to stage 1   2  
Net remeasurement of loss allowance 731 (122) 3
New financial assets originated or purchased / Provision charged to profit or loss 99 1,787 17,244
Financial assets that have been derecognized/paid (58) (3,089) (18,189)
Ending balance 794 22 1,444
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 1,141,997 839,904 1,066,543
Transfer from stage 1 to stage 2 (265,008) (276,858) (142,762)
Transfer from stage 1 to stage 3 (378,612) (429,739) (70,964)
Transfer from stage 2 to stage 1 238,008 300,775 211,028
Transfer from stage 3 to stage 1 77,112 71,599 55,658
Net remeasurement of loss allowance 285,228 484,735 (1,000)
New financial assets originated or purchased / Provision charged to profit or loss 296,328 473,697 473,946
Financial assets that have been derecognized/paid (250,818) (214,602) (201,480)
Sales of portfolio (21) (2,369)  
FX and other movements 3,660 (3,200) (2,575)
Discontinued operations     (9,751)
Loss of control in subsidiary     (412,745)
Write-offs (41,956) (101,945) (125,994)
Ending balance 1,105,918 1,141,997 839,904
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Mortgages [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 45,080 48,763 93,122
Transfer from stage 1 to stage 2 (9,481) (7,295) (4,775)
Transfer from stage 1 to stage 3 (414) (635) (266)
Transfer from stage 2 to stage 1 30,885 26,638 70,544
Transfer from stage 3 to stage 1 9,525 10,329 15,267
Net remeasurement of loss allowance 6,687 (14,157) (55,643)
New financial assets originated or purchased / Provision charged to profit or loss 9,943 9,654 12,837
Financial assets that have been derecognized/paid (10,560) (20,196) (27,664)
Unwind of discount   12  
FX and other movements 241 332 (4,930)
Discontinued operations     (6,193)
Loss of control in subsidiary     (41,518)
Write-offs (21,818) (8,365) (2,018)
Ending balance 60,088 45,080 48,763
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 12,068 6,238 6,740
Transfer from stage 1 to stage 2 (2,380) (3,411) (2,285)
Transfer from stage 1 to stage 3 (24,943) (1,308) (816)
Transfer from stage 2 to stage 1 912 1,729 2,901
Transfer from stage 3 to stage 1 57 210 339
Net remeasurement of loss allowance 20,456 6,322 (3,625)
New financial assets originated or purchased / Provision charged to profit or loss 2,627 4,647 5,480
Financial assets that have been derecognized/paid (5,694) (1,953) (2,248)
Sales of portfolio (3,042)    
Write-offs (2) (406) (248)
Ending balance 59 12,068 6,238
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 25,965    
Ending balance 31,226 25,965  
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 12,613 28,563 3,297
Transfer from stage 2 to stage 1   1,485  
Net remeasurement of loss allowance (1,774) (14,315) 19,761
New financial assets originated or purchased / Provision charged to profit or loss 3,279 2,669 2,198
Financial assets that have been derecognized/paid (1,366) (1,466) (1,015)
FX and other movements 1,577 (4,323) 4,910
Discontinued operations     (85)
Loss of control in subsidiary     (503)
Ending balance 14,329 12,613 28,563
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 (23,326,776)    
Ending balance (27,050,198) (23,326,776)  
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 12,972 12,686 123,978
Net remeasurement of loss allowance 452 (892) (3,217)
New financial assets originated or purchased / Provision charged to profit or loss 9,029 6,470 4,409
Financial assets that have been derecognized/paid (4,895) (4,342) (4,870)
FX and other movements 752 (950) 809
Discontinued operations     2,935
Loss of control in subsidiary     (111,358)
Ending balance 18,310 12,972 12,686
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 199,382 197,115 217,643
Discontinued operations     469
Entity deconsolidation   (3,245)  
Provision charged to profit or loss 56,296 39,750 27,519
Loss of control in subsidiary     (33,024)
Entity liquidation     (1,592)
Recovery for partial payments from the clients (29,727) (14,599) (6,751)
Write-offs (35,436) (18,516) (7,948)
Exchange gains (losses) in foreign currency 526 (1,123) 799
Ending balance 191,041 199,382 197,115
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 1,315,930    
Ending balance 1,250,965 1,315,930  
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 7,682 6,461 10,097
Transfer from stage 1 to stage 2 1,233 1,690 558
Transfer from stage 2 to stage 3 (167) (329) (211)
Transfer from stage 3 to stage 2 1 4 34
Transfer from stage 2 to stage 1 (2,998) (1,105) (3,379)
Net remeasurement of loss allowance (14) (769) (2,264)
New financial assets originated or purchased / Provision charged to profit or loss 1,934 1,732 1,826
FX and other movements   (2) 1
Discontinued operations     (63)
Loss of control in subsidiary     (138)
Ending balance 7,671 7,682 6,461
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 19,188 20,201 16,771
Net remeasurement of loss allowance 2,779 257 2,190
FX and other movements 229 (1,270) 1,240
Ending balance 22,196 19,188 20,201
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 1,308,248    
Ending balance 1,243,294 1,308,248  
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 1,284,791 1,425,922 2,703,117
Transfer from stage 1 to stage 2 332,518 332,307 183,333
Transfer from stage 2 to stage 3 (1,229,034) (1,180,705) (625,769)
Transfer from stage 3 to stage 2 174,006 309,622 165,584
Transfer from stage 2 to stage 1 (339,075) (479,360) (377,758)
Net remeasurement of loss allowance 1,357,110 1,284,696 695,126
New financial assets originated or purchased / Provision charged to profit or loss 182,736 307,919 316,329
Financial assets that have been derecognized/paid (140,828) (157,015) (269,020)
Sales of portfolio (793) (1,809)  
Unwind of discount 77 62 28
FX and other movements 7,609 (16,568) 28,302
Discontinued operations     14,798
Loss of control in subsidiary     (1,003,291)
Write-offs (412,365) (540,280) (404,857)
Ending balance 1,216,752 1,284,791 1,425,922
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 218,824 515,202 1,006,822
Transfer from stage 1 to stage 2 55,649 44,743 33,511
Transfer from stage 2 to stage 3 (141,584) (130,514) (88,123)
Transfer from stage 3 to stage 2 42,213 40,868 61,402
Transfer from stage 2 to stage 1 (69,270) (150,216) (93,285)
Net remeasurement of loss allowance 116,498 (99,159) (192,441)
New financial assets originated or purchased / Provision charged to profit or loss 40,087 61,148 137,383
Financial assets that have been derecognized/paid (45,074) (51,476) (109,718)
Unwind of discount 51 16 14
FX and other movements 3,974 (9,657) 9,586
Discontinued operations     (2,612)
Loss of control in subsidiary     (244,715)
Write-offs (3,780) (2,131) (2,622)
Ending balance 217,588 218,824 515,202
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 1 2  
Ending balance 1    
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 993,268 853,159 1,396,101
Transfer from stage 1 to stage 2 265,008 276,858 142,762
Transfer from stage 2 to stage 3 (1,030,039) (1,004,192) (498,736)
Transfer from stage 3 to stage 2 117,468 257,854 92,189
Transfer from stage 2 to stage 1 (238,008) (300,775) (211,028)
Net remeasurement of loss allowance 1,160,328 1,310,059 863,809
New financial assets originated or purchased / Provision charged to profit or loss 137,990 238,963 174,616
Financial assets that have been derecognized/paid (84,915) (98,788) (149,438)
Sales of portfolio (602) (1,809)  
Unwind of discount 26 46 13
FX and other movements 2,365 (4,786) 9,007
Discontinued operations     15,493
Loss of control in subsidiary     (585,225)
Write-offs (395,579) (533,321) (396,404)
Ending balance 927,310 993,268 853,159
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgages [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 66,333 52,639 286,903
Transfer from stage 1 to stage 2 9,481 7,295 4,775
Transfer from stage 2 to stage 3 (48,596) (35,387) (28,228)
Transfer from stage 3 to stage 2 13,789 9,526 10,553
Transfer from stage 2 to stage 1 (30,885) (26,638) (70,544)
Net remeasurement of loss allowance 74,143 63,399 19,536
New financial assets originated or purchased / Provision charged to profit or loss 4,590 7,711 4,133
Financial assets that have been derecognized/paid (5,716) (6,486) (8,938)
Unwind of discount     1
FX and other movements 1,270 (2,125) 9,709
Discontinued operations     1,917
Loss of control in subsidiary     (173,351)
Write-offs (12,570) (3,601) (3,827)
Ending balance 71,839 66,333 52,639
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 6,366 4,922 13,291
Transfer from stage 1 to stage 2 2,380 3,411 2,285
Transfer from stage 2 to stage 3 (8,815) (10,612) (10,682)
Transfer from stage 3 to stage 2 536 1,374 1,440
Transfer from stage 2 to stage 1 (912) (1,729) (2,901)
Net remeasurement of loss allowance 6,140 10,395 4,222
New financial assets originated or purchased / Provision charged to profit or loss 69 97 197
Financial assets that have been derecognized/paid (5,123) (265) (926)
Sales of portfolio (191)    
Write-offs (436) (1,227) (2,004)
Ending balance 14 6,366 4,922
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 19,188    
Ending balance 22,196 19,188  
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 4,269 8,367 7,401
Transfer from stage 2 to stage 1   (1,485)  
Net remeasurement of loss allowance (562) (996) 547
Financial assets that have been derecognized/paid     (1,090)
FX and other movements 639 (1,617) 1,509
Ending balance 4,346 4,269 8,367
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 7,081,394    
Ending balance 7,018,695 7,081,394  
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 949 289 6,028
Transfer from stage 1 to stage 3 503 218 57
Transfer from stage 2 to stage 3 167 329 211
Transfer from stage 3 to stage 2 (1) (4) (34)
Transfer from stage 3 to stage 1 (20) (29) (289)
Net remeasurement of loss allowance 544 211 (1,218)
New financial assets originated or purchased / Provision charged to profit or loss 92 (65) (41)
Discontinued operations     (133)
Loss of control in subsidiary     (4,292)
Ending balance 2,234 949 289
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 141,129 140,123 129,449
Net remeasurement of loss allowance 58,789 46,867 48,003
FX and other movements 3,212 (2,464) 177
Write-offs (85,622) (43,397) (37,506)
Ending balance 117,508 141,129 140,123
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 7,080,445    
Ending balance 7,016,461 7,080,445  
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 6,939,316 6,276,705 6,748,049
Transfer from stage 1 to stage 3 422,672 450,063 105,447
Transfer from stage 2 to stage 3 1,229,034 1,180,705 625,769
Transfer from stage 3 to stage 2 (174,006) (309,622) (165,584)
Transfer from stage 3 to stage 1 (112,495) (113,974) (98,057)
Net remeasurement of loss allowance 3,014,696 2,815,219 2,404,266
New financial assets originated or purchased / Provision charged to profit or loss 597,562 693,438 595,011
Financial assets that have been derecognized/paid (722,728) (854,806) (895,971)
Sales of portfolio (130,799) (357,202)  
Unwind of discount 816,010 724,674 550,935
FX and other movements 25,775 (43,684) 26,477
Discontinued operations     253,502
Loss of control in subsidiary     (1,197,326)
Write-offs (5,006,084) (3,522,200) (2,675,813)
Ending balance 6,898,953 6,939,316 6,276,705
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 4,463,335 4,379,006 4,192,268
Transfer from stage 1 to stage 3 18,703 18,381 33,401
Transfer from stage 2 to stage 3 141,584 130,514 88,123
Transfer from stage 3 to stage 2 (42,213) (40,868) (61,402)
Transfer from stage 3 to stage 1 (25,801) (31,836) (26,793)
Net remeasurement of loss allowance 793,560 678,828 1,129,665
New financial assets originated or purchased / Provision charged to profit or loss 119,881 155,464 317,361
Financial assets that have been derecognized/paid (356,292) (450,980) (714,900)
Sales of portfolio (94,960) (194,305)  
Unwind of discount 593,517 517,513 405,090
FX and other movements 21,427 (35,823) 21,774
Discontinued operations     3,496
Loss of control in subsidiary     (268,521)
Write-offs (1,211,511) (662,559) (740,556)
Ending balance 4,421,230 4,463,335 4,379,006
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 2,172,181 1,618,849 2,118,360
Transfer from stage 1 to stage 3 378,612 429,739 70,964
Transfer from stage 2 to stage 3 1,030,039 1,004,192 498,736
Transfer from stage 3 to stage 2 (117,468) (257,854) (92,189)
Transfer from stage 3 to stage 1 (77,112) (71,599) (55,658)
Net remeasurement of loss allowance 2,157,929 2,145,306 1,245,918
New financial assets originated or purchased / Provision charged to profit or loss 467,654 481,362 267,651
Financial assets that have been derecognized/paid (330,260) (394,718) (175,323)
Sales of portfolio (9,441) (162,897)  
Unwind of discount 199,790 183,157 119,709
FX and other movements 3,018 (5,378) 3,555
Discontinued operations     240,008
Loss of control in subsidiary     (802,042)
Write-offs (3,742,152) (2,797,978) (1,820,840)
Ending balance 2,132,790 2,172,181 1,618,849
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgages [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 268,574 251,039 352,382
Transfer from stage 1 to stage 3 414 635 266
Transfer from stage 2 to stage 3 48,596 35,387 28,228
Transfer from stage 3 to stage 2 (13,789) (9,526) (10,553)
Transfer from stage 3 to stage 1 (9,525) (10,329) (15,267)
Net remeasurement of loss allowance 66,506 (21,731) 25,930
New financial assets originated or purchased / Provision charged to profit or loss 10,008 56,558 9,982
Financial assets that have been derecognized/paid (10,079) (8,896) (5,375)
Unwind of discount 21,019 16,988 17,084
FX and other movements 1,330 (2,483) 1,148
Discontinued operations     9,998
Loss of control in subsidiary     (126,763)
Write-offs (41,666) (39,068) (36,021)
Ending balance 341,388 268,574 251,039
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 35,226 27,811 85,039
Transfer from stage 1 to stage 3 24,943 1,308 816
Transfer from stage 2 to stage 3 8,815 10,612 10,682
Transfer from stage 3 to stage 2 (536) (1,374) (1,440)
Transfer from stage 3 to stage 1 (57) (210) (339)
Net remeasurement of loss allowance (3,299) 12,816 2,753
New financial assets originated or purchased / Provision charged to profit or loss 19 54 17
Financial assets that have been derecognized/paid (26,097) (212) (373)
Sales of portfolio (26,398)    
Unwind of discount 1,684 7,016 9,052
Write-offs (10,755) (22,595) (78,396)
Ending balance 3,545 35,226 $ 27,811
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 141,129    
Ending balance $ 117,508 $ 141,129