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RISK MANAGEMENT - Changes in gross carrying amount (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]      
Financial assets at beginning of period $ 274,682,875    
Financial assets at end of period 280,746,878 $ 274,682,875  
Other accounts receivable at amortized cost [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 20,255,758    
Financial assets at end of period 22,171,973 20,255,758  
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]      
Financial assets at beginning of period 235,373,468    
Financial assets at end of period 236,970,165 235,373,468  
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]      
Financial assets at beginning of period 179,115,847    
Financial assets at end of period 176,168,055 179,115,847  
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 188,313,361 231,573,437 $ 206,447,165
New financial assets originated or purchased 122,753,246 142,677,855 117,046,001
Financial assets that have been derecognized/paid (114,598,525) (114,550,381) (107,353,830)
Net remeasurement of amortized cost and other receivables 1,790,448 1,547,562 134,578
Write-offs (4,176,499) (3,211,915) (3,546,071)
Sale of loan portfolio - loss allowance (361,380)    
Sale of loan portfolio - cash (113,460)    
Gain or loss on sale portfolio 3,331    
Discontinued operations   1,675,137 6,209,789
Reclassification BAC     8,558,624
Loss of control in subsidiary   (77,434,601)  
FX and other movements (7,406,752) 6,036,267 4,077,181
Financial assets at end of period 186,203,770 188,313,361 231,573,437
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]      
Financial assets at beginning of period 105,248,652    
Financial assets at end of period 102,145,802 105,248,652  
Financial assets at amortised cost, category [member] | Loans to corporate entities [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 110,742,842    
Financial assets at end of period 107,440,424 110,742,842  
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]      
Financial assets at beginning of period 99,282,353    
Financial assets at end of period 101,753,217 99,282,353  
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 104,775,099 122,027,804 110,986,938
New financial assets originated or purchased 77,509,567 78,320,455 67,013,320
Financial assets that have been derecognized/paid (71,469,411) (67,255,879) (66,033,305)
Net remeasurement of amortized cost and other receivables 3,086,433 1,488,843 326,239
Write-offs (667,993) (746,163) (1,085,415)
Sale of loan portfolio - loss allowance (194,305)    
Sale of loan portfolio - cash (78,613)    
Gain or loss on sale portfolio (7,415)    
Discontinued operations   2,678,679 1,890,724
Reclassification BAC     5,560,875
Loss of control in subsidiary   (36,433,272)  
FX and other movements (5,905,545) 4,694,632 3,368,428
Financial assets at end of period 107,047,817 104,775,099 122,027,804
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]      
Financial assets at beginning of period 5,966,299    
Financial assets at end of period 392,585 5,966,299  
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 5,967,743 3,218,433 4,693,678
New financial assets originated or purchased 206,661 23,119,917 1,531,771
Financial assets that have been derecognized/paid (6,003,176) (18,982,865) (2,671,104)
Net remeasurement of amortized cost and other receivables (1,391) 84,916 16,537
Discontinued operations   249 1,529
Reclassification BAC     (607,582)
Loss of control in subsidiary   (1,442,427)  
FX and other movements 222,770 (30,480) 253,604
Financial assets at end of period 392,607 5,967,743 3,218,433
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]      
Financial assets at beginning of period 56,107,532    
Financial assets at end of period 55,692,165 56,107,532  
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 59,419,444 76,889,145 65,835,457
New financial assets originated or purchased 39,018,954 36,243,274 43,803,992
Financial assets that have been derecognized/paid (32,518,213) (25,911,661) (35,802,200)
Net remeasurement of amortized cost and other receivables (1,380,933) (37,897) (234,357)
Write-offs (3,433,244) (2,343,238) (2,383,572)
Sale of loan portfolio - loss allowance (167,075)    
Sale of loan portfolio - cash (34,847)    
Gain or loss on sale portfolio 10,746    
Discontinued operations   597,849 3,372,792
Reclassification BAC     2,097,155
Loss of control in subsidiary   (26,721,679)  
FX and other movements (915,221) 703,651 199,878
Financial assets at end of period 59,999,611 59,419,444 76,889,145
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]      
Financial assets at beginning of period 17,530,914    
Financial assets at end of period 18,106,219 17,530,914  
Financial assets at amortised cost, category [member] | Mortgage [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 17,883,355 29,120,316 24,558,771
New financial assets originated or purchased 5,760,723 4,774,892 4,509,177
Financial assets that have been derecognized/paid (4,399,685) (2,191,978) (2,628,241)
Net remeasurement of amortized cost and other receivables 101,603 (7,610) (406)
Write-offs (51,034) (41,866) (27,176)
Discontinued operations   (1,601,640) 944,744
Reclassification BAC     1,508,176
Loss of control in subsidiary   (12,837,223)  
FX and other movements (808,756) 668,464 255,271
Financial assets at end of period 18,486,206 17,883,355 29,120,316
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]      
Financial assets at beginning of period 228,749    
Financial assets at end of period 223,869 228,749  
Financial assets at amortised cost, category [member] | Microcredit [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 267,720 317,739 372,321
New financial assets originated or purchased 257,341 219,317 187,741
Financial assets that have been derecognized/paid (208,040) (207,998) (218,980)
Net remeasurement of amortized cost and other receivables (15,264) 19,310 26,565
Write-offs (24,228) (80,648) (49,908)
Financial assets at end of period 277,529 267,720 317,739
Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 20,255,758    
Financial assets at end of period 22,171,973 20,255,758  
Financial assets at amortised cost, category [member] | Other accounts receivable, simplified approach | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 5,612,876    
Financial assets at end of period 6,152,455 5,612,876  
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]      
Financial assets at beginning of period 22,461,805    
Financial assets at end of period 23,326,776 22,461,805  
Debt securities [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 35,995,562    
Financial assets at end of period 40,438,606 35,995,562  
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 164,906,023 190,819,121 167,489,648
Transfer from stage 1 to stage 2 (10,951,993) (8,276,152) (10,995,706)
Transfer from stage 1 to stage 3 (2,059,976) (1,659,371) (1,463,566)
Transfer from stage 2 to stage 1 9,137,025 8,288,205 5,474,571
Transfer from stage 3 to stage 1 509,414 367,294 333,523
New financial assets originated or purchased 111,919,244 138,932,725 112,304,857
Financial assets that have been derecognized/paid (103,065,373) (104,212,015) (97,996,142)
Net remeasurement of amortized cost and other receivables 841,002 (1,008,007) (2,094,986)
Write-offs (114,019) (131,245) (71,864)
Sale of loan portfolio - loss allowance (2,369)    
Discontinued operations   4,985,907 5,034,757
Reclassification BAC     9,531,734
Loss of control in subsidiary   (68,298,203)  
FX and other movements (6,594,417) 5,097,764 3,272,295
Financial assets at end of period 164,524,561 164,906,023 190,819,121
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 89,958,234 100,858,380 92,626,136
Transfer from stage 1 to stage 2 (3,831,869) (3,412,530) (6,217,821)
Transfer from stage 1 to stage 3 (979,725) (1,183,677) (1,074,291)
Transfer from stage 2 to stage 1 4,428,540 3,502,330 2,585,939
Transfer from stage 3 to stage 1 216,849 152,800 189,944
New financial assets originated or purchased 75,428,991 76,419,265 64,413,391
Financial assets that have been derecognized/paid (66,409,339) (60,407,178) (60,721,302)
Net remeasurement of amortized cost and other receivables 781,835 (180,790) (841,693)
Write-offs (3,303) (2,985) (4,427)
Discontinued operations   3,560,936 1,592,033
Reclassification BAC     5,333,890
Loss of control in subsidiary   (33,537,080)  
FX and other movements (5,261,913) 4,188,763 2,976,581
Financial assets at end of period 94,328,300 89,958,234 100,858,380
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 5,967,742 3,218,433 4,693,539
New financial assets originated or purchased 206,661 23,119,916 1,531,771
Financial assets that have been derecognized/paid (6,003,176) (18,982,865) (2,671,104)
Net remeasurement of amortized cost and other receivables (1,390) 84,916 16,676
Discontinued operations   249 1,529
Reclassification BAC     (607,582)
Loss of control in subsidiary   (1,442,427)  
FX and other movements 222,770 (30,480) 253,604
Financial assets at end of period 392,607 5,967,742 3,218,433
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 52,529,128 63,811,740 51,453,521
Transfer from stage 1 to stage 2 (5,701,009) (3,939,985) (3,955,559)
Transfer from stage 1 to stage 3 (1,029,073) (456,120) (363,213)
Transfer from stage 2 to stage 1 3,616,500 2,810,585 2,193,145
Transfer from stage 3 to stage 1 212,519 146,229 102,385
New financial assets originated or purchased 32,474,641 34,459,205 41,759,298
Financial assets that have been derecognized/paid (28,331,264) (22,753,127) (32,129,847)
Net remeasurement of amortized cost and other receivables 20,995 (788,200) (1,170,836)
Write-offs (101,945) (125,994) (65,031)
Sale of loan portfolio - loss allowance (2,369)    
Discontinued operations   1,156,225 2,732,637
Reclassification BAC     3,256,691
Loss of control in subsidiary   (22,340,862)  
FX and other movements (832,014) 549,432 (1,451)
Financial assets at end of period 52,856,109 52,529,128 63,811,740
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 16,226,428 22,743,149 18,537,882
Transfer from stage 1 to stage 2 (1,382,946) (896,435) (773,274)
Transfer from stage 1 to stage 3 (40,569) (13,682) (18,990)
Transfer from stage 2 to stage 1 1,082,759 1,954,180 657,398
Transfer from stage 3 to stage 1 79,530 67,285 39,085
New financial assets originated or purchased 3,594,678 4,715,113 4,417,205
Financial assets that have been derecognized/paid (2,142,766) (1,891,256) (2,315,419)
Net remeasurement of amortized cost and other receivables 35,508 (130,620) (99,596)
Write-offs (8,365) (2,018) (1,996)
Discontinued operations   268,497 708,558
Reclassification BAC     1,548,735
Loss of control in subsidiary   (10,977,834)  
FX and other movements (723,260) 390,049 43,561
Financial assets at end of period 16,720,997 16,226,428 22,743,149
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 224,491 187,419 178,570
Transfer from stage 1 to stage 2 (36,169) (27,202) (49,052)
Transfer from stage 1 to stage 3 (10,609) (5,892) (7,072)
Transfer from stage 2 to stage 1 9,226 21,110 38,089
Transfer from stage 3 to stage 1 516 980 2,109
New financial assets originated or purchased 214,273 219,226 183,192
Financial assets that have been derecognized/paid (178,828) (177,589) (158,470)
Net remeasurement of amortized cost and other receivables 4,054 6,687 463
Write-offs (406) (248) (410)
Financial assets at end of period 226,548 224,491 187,419
12-month expected credit losses [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 14,315,166    
Financial assets at end of period 15,713,547 14,315,166  
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 11,774,908 26,898,573 26,588,199
Transfer from stage 1 to stage 2 10,951,993 8,276,152 10,995,706
Transfer from stage 2 to stage 3 (3,372,104) (2,939,477) (3,879,203)
Transfer from stage 2 to stage 1 (9,137,025) (8,288,205) (5,474,571)
Transfer from stage 3 to stage 2 865,781 646,995 809,475
Transfer from stage 3 to stage 1 11,192    
New financial assets originated or purchased 2,583,927 2,450,770 3,354,034
Financial assets that have been derecognized/paid (3,798,676) (6,284,621) (5,649,252)
Net remeasurement of amortized cost and other receivables 164,973 213,598 723
Write-offs (540,280) (404,857) (198,682)
Sale of loan portfolio - loss allowance (1,809)    
Sale of loan portfolio - cash (694)    
Gain or loss on sale portfolio (59)    
Discontinued operations   (1,228,725) 866,278
Reclassification BAC     (1,103,917)
Loss of control in subsidiary   (8,288,834)  
FX and other movements (388,080) 723,539 589,783
Financial assets at end of period 9,114,047 11,774,908 26,898,573
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 5,672,094 11,747,975 9,843,700
Transfer from stage 1 to stage 2 3,831,869 3,412,530 6,217,821
Transfer from stage 2 to stage 3 (986,422) (1,259,406) (1,757,273)
Transfer from stage 2 to stage 1 (4,428,540) (3,502,330) (2,585,939)
Transfer from stage 3 to stage 2 327,479 311,858 499,834
New financial assets originated or purchased 924,475 1,177,731 1,819,955
Financial assets that have been derecognized/paid (1,587,486) (3,742,642) (2,836,505)
Net remeasurement of amortized cost and other receivables 18,893 102,831 (42,188)
Write-offs (2,131) (2,622) (4,913)
Discontinued operations   71,257 161,627
Reclassification BAC     236,162
Loss of control in subsidiary   (2,931,541)  
FX and other movements (239,697) 286,453 195,694
Financial assets at end of period 3,530,534 5,672,094 11,747,975
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 4,928,963 9,828,726 11,382,726
Transfer from stage 1 to stage 2 5,701,009 3,939,985 3,955,559
Transfer from stage 2 to stage 3 (2,089,300) (1,433,947) (1,869,405)
Transfer from stage 2 to stage 1 (3,616,500) (2,810,585) (2,193,145)
Transfer from stage 3 to stage 2 469,333 258,837 252,599
Transfer from stage 3 to stage 1 11,192    
New financial assets originated or purchased 1,586,439 1,219,507 1,448,809
Financial assets that have been derecognized/paid (2,095,326) (2,332,167) (2,570,086)
Net remeasurement of amortized cost and other receivables 126,837 69,133 15,274
Write-offs (533,321) (396,404) (183,875)
Sale of loan portfolio - loss allowance (1,809)    
Sale of loan portfolio - cash (694)    
Gain or loss on sale portfolio (59)    
Discontinued operations   (80,679) 506,255
Reclassification BAC     (1,111,052)
Loss of control in subsidiary   (3,498,287)  
FX and other movements (77,989) 164,844 195,067
Financial assets at end of period 4,408,775 4,928,963 9,828,726
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 1,159,795 5,278,510 5,217,872
Transfer from stage 1 to stage 2 1,382,946 896,435 773,274
Transfer from stage 2 to stage 3 (271,352) (219,362) (164,767)
Transfer from stage 2 to stage 1 (1,082,759) (1,954,180) (657,398)
Transfer from stage 3 to stage 2 66,023 72,617 47,618
New financial assets originated or purchased 71,626 53,475 85,222
Financial assets that have been derecognized/paid (109,535) (197,058) (207,019)
Net remeasurement of amortized cost and other receivables 18,036 39,252 22,411
Write-offs (3,601) (3,827) (7,094)
Discontinued operations   (1,219,303) 198,396
Reclassification BAC     (229,027)
Loss of control in subsidiary   (1,859,006)  
FX and other movements (70,394) 272,242 199,022
Financial assets at end of period 1,160,785 1,159,795 5,278,510
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 14,056 43,362 143,901
Transfer from stage 1 to stage 2 36,169 27,202 49,052
Transfer from stage 2 to stage 3 (25,030) (26,762) (87,758)
Transfer from stage 2 to stage 1 (9,226) (21,110) (38,089)
Transfer from stage 3 to stage 2 2,946 3,683 9,424
New financial assets originated or purchased 1,387 57 48
Financial assets that have been derecognized/paid (6,329) (12,754) (35,642)
Net remeasurement of amortized cost and other receivables 1,207 2,382 5,226
Write-offs (1,227) (2,004) (2,800)
Financial assets at end of period 13,953 14,056 43,362
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 145,724    
Financial assets at end of period 119,607 145,724  
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Loan portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 11,632,430 13,855,743 12,369,318
Transfer from stage 1 to stage 3 2,059,976 1,659,371 1,463,566
Transfer from stage 2 to stage 3 3,372,104 2,939,477 3,879,203
Transfer from stage 3 to stage 2 (865,781) (646,995) (809,475)
Transfer from stage 3 to stage 1 (520,606) (367,294) (333,523)
New financial assets originated or purchased 8,250,075 1,294,360 1,387,110
Financial assets that have been derecognized/paid (7,734,476) (4,053,745) (3,708,436)
Net remeasurement of amortized cost and other receivables 784,473 2,341,971 2,228,841
Write-offs (3,522,200) (2,675,813) (3,275,525)
Sale of loan portfolio - loss allowance (357,202)    
Sale of loan portfolio - cash (112,766)    
Gain or loss on sale portfolio 3,390    
Discontinued operations   (2,082,045) 308,754
Reclassification BAC     130,807
Loss of control in subsidiary   (847,564)  
FX and other movements (424,255) 214,964 215,103
Financial assets at end of period 12,565,162 11,632,430 13,855,743
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 9,144,771 9,421,449 8,517,102
Transfer from stage 1 to stage 3 979,725 1,183,677 1,074,291
Transfer from stage 2 to stage 3 986,422 1,259,406 1,757,273
Transfer from stage 3 to stage 2 (327,479) (311,858) (499,834)
Transfer from stage 3 to stage 1 (216,849) (152,800) (189,944)
New financial assets originated or purchased 1,156,101 723,459 779,974
Financial assets that have been derecognized/paid (3,472,586) (3,106,059) (2,475,498)
Net remeasurement of amortized cost and other receivables 2,285,705 1,566,802 1,210,120
Write-offs (662,559) (740,556) (1,076,075)
Sale of loan portfolio - loss allowance (194,305)    
Sale of loan portfolio - cash (78,613)    
Gain or loss on sale portfolio (7,415)    
Discontinued operations   (953,514) 137,064
Reclassification BAC     (9,177)
Loss of control in subsidiary   35,349  
FX and other movements (403,935) 219,416 196,153
Financial assets at end of period 9,188,983 9,144,771 9,421,449
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 1   139
New financial assets originated or purchased   1  
Net remeasurement of amortized cost and other receivables (1)   (139)
Financial assets at end of period   1  
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Loans to consumers [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 1,961,353 3,248,679 2,999,210
Transfer from stage 1 to stage 3 1,029,073 456,120 363,213
Transfer from stage 2 to stage 3 2,089,300 1,433,947 1,869,405
Transfer from stage 3 to stage 2 (469,333) (258,837) (252,599)
Transfer from stage 3 to stage 1 (223,711) (146,229) (102,385)
New financial assets originated or purchased 4,957,874 564,562 595,885
Financial assets that have been derecognized/paid (2,091,623) (826,367) (1,102,267)
Net remeasurement of amortized cost and other receivables (1,528,765) 681,170 921,205
Write-offs (2,797,978) (1,820,840) (2,134,666)
Sale of loan portfolio - loss allowance (162,897)    
Sale of loan portfolio - cash (34,153)    
Gain or loss on sale portfolio 10,805    
Discontinued operations   (477,697) 133,900
Reclassification BAC     (48,484)
Loss of control in subsidiary   (882,530)  
FX and other movements (5,218) (10,625) 6,262
Financial assets at end of period 2,734,727 1,961,353 3,248,679
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Mortgage [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 497,132 1,098,657 803,017
Transfer from stage 1 to stage 3 40,569 13,682 18,990
Transfer from stage 2 to stage 3 271,352 219,362 164,767
Transfer from stage 3 to stage 2 (66,023) (72,617) (47,618)
Transfer from stage 3 to stage 1 (79,530) (67,285) (39,085)
New financial assets originated or purchased 2,094,419 6,304 6,750
Financial assets that have been derecognized/paid (2,147,384) (103,664) (105,803)
Net remeasurement of amortized cost and other receivables 48,059 83,758 76,779
Write-offs (39,068) (36,021) (18,086)
Discontinued operations   (650,834) 37,790
Reclassification BAC     188,468
Loss of control in subsidiary   (383)  
FX and other movements (15,102) 6,173 12,688
Financial assets at end of period 604,424 497,132 1,098,657
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Microcredit [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 29,173 86,958 49,850
Transfer from stage 1 to stage 3 10,609 5,892 7,072
Transfer from stage 2 to stage 3 25,030 26,762 87,758
Transfer from stage 3 to stage 2 (2,946) (3,683) (9,424)
Transfer from stage 3 to stage 1 (516) (980) (2,109)
New financial assets originated or purchased 41,681 34 4,501
Financial assets that have been derecognized/paid (22,883) (17,655) (24,868)
Net remeasurement of amortized cost and other receivables (20,525) 10,241 20,876
Write-offs (22,595) (78,396) (46,698)
Financial assets at end of period 37,028 29,173 $ 86,958
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Gross carrying amount [member]      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Financial assets at beginning of period 181,992    
Financial assets at end of period $ 186,364 $ 181,992