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RISK MANAGEMENT - Credit risk model - Loss allowance (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | $ (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] |  |  |  |
Financial assets | 10,478,009 | 10,521,501 |  |
Accumulated impairment [member] | Loan commitments and financial guarantee contracts [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 72,414 | 70,268 | $ 64,910 | $ 62,041
Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 2,017,308 | 1,924,795 |  |
Accumulated impairment [member] | 12-month expected credit losses [member] | Loan commitments and financial guarantee contracts [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 62,509 | 61,637 | 58,160 | 45,916
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,250,965 | 1,315,930 |  |
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Loan commitments and financial guarantee contracts [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 7,671 | 7,682 | 6,461 | 10,097
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 7,018,695 | 7,081,394 |  |
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Loan commitments and financial guarantee contracts [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 2,234 | 949 | 289 | 6,028
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] |  |  |  |
Financial assets | 170,930 | 186,282 | 185,301 | 165,159
Other accounts receivable, general approach | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 31,226 | 25,965 | 24,977 | 18,939
Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 22,196 | 19,188 | 20,201 | 16,771
Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 117,508 | 141,129 | 140,123 | 129,449
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] |  |  |  |
Financial assets | 191,041 | 199,382 |  |
Other accounts receivable, simplified approach | Accumulated impairment [member] | Lifetime expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 191,041 | 199,382 | 197,115 | 217,643
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] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | 10,387,285 | 10,438,261 |  |
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,936,489 | 1,850,186 |  |
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,243,294 | 1,308,248 |  |
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 7,016,461 | 7,080,445 |  |
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 | (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] |  |  |  |
Financial assets | 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] |  |  |  |
Financial assets | 10,006,639 | 10,035,715 | 9,197,514 | 11,275,612
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,890,934 | 1,811,608 | 1,494,887 | 1,824,446
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,216,752 | 1,284,791 | 1,425,922 | 2,703,117
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 6,898,953 | 6,939,316 | 6,276,705 | 6,748,049
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 | (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] |  |  |  |
Financial assets | 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] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | 5,362,893 | 5,294,600 | 5,492,746 | 5,854,745
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 724,075 | 612,441 | 598,538 | 655,655
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 217,588 | 218,824 | 515,202 | 1,006,822
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 4,421,230 | 4,463,335 | 4,379,006 | 4,192,268
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 | (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] |  |  |  |
Financial assets | 795 | 22 | 1,444 | 2,386
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 794 | 22 | 1,444 | 2,386
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1 |  |  |
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 | (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] |  |  |  |
Financial assets | 4,166,018 | 4,307,446 | 3,311,912 | 4,581,004
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 1,105,918 | 1,141,997 | 839,904 | 1,066,543
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 927,310 | 993,268 | 853,159 | 1,396,101
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 2,132,790 | 2,172,181 | 1,618,849 | 2,118,360
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] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | 473,315 | 379,987 | 352,441 | 732,407
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 60,088 | 45,080 | 48,763 | 93,122
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 71,839 | 66,333 | 52,639 | 286,903
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 341,388 | 268,574 | 251,039 | 352,382
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 | (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] |  |  |  |
Financial assets | 3,618 | 53,660 | 38,971 | 105,070
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 59 | 12,068 | 6,238 | 6,740
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 14 | 6,366 | 4,922 | 13,291
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 3,545 | 35,226 | 27,811 | 85,039
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] |  |  |  |
Financial assets | 361,971 | 385,664 |  |
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 31,226 | 25,965 |  |
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 22,196 | 19,188 |  |
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 117,508 | 141,129 |  |
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] |  |  |  |
Financial assets | 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] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | 18,675 | 16,882 | 36,930 | 10,698
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 14,329 | 12,613 | 28,563 | 3,297
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | 4,346 | 4,269 | 8,367 | 7,401
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] |  |  |  |
Financial assets | (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] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | (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] |  |  |  |
Financial assets | 18,310 | 12,972 | 12,686 | 123,978
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member] | 12-month expected credit losses [member] |  |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |  |
Financial assets | $ 18,310 | $ 12,972 | $ 12,686 | $ 123,978

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