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RISK MANAGEMENT - Credit risk model - Impairment losses (Details) - COP ($) $ in Millions | 12 Months Ended
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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] |  |  |
Impairment loss | $ 4,182,394 | $ 2,493,148 | $ 2,721,083
Loss allowance - costs and expenses of sales goods and services | (51,035) | (59,073) | (51,064)
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] |  |  |
Impairment loss | 4,802,074 | 3,179,476 | 4,551,160
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] |  |  |
Impairment loss | 4,725,410 | 3,100,835 | 4,470,862
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] |  |  |
Impairment loss | 203,061 | 622,783 | 1,468,182
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] |  |  |
Impairment loss | (1,422) | (942) | 1,535
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] |  |  |
Impairment loss | 4,426,014 | 2,498,699 | 2,813,445
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] |  |  |
Impairment loss | 65,856 | (25,202) | 170,176
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] |  |  |
Impairment loss | 31,901 | 5,497 | 17,524
Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impairment loss | $ 76,664 | $ 78,641 | $ 80,298

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 130 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss for loans and advances. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + Details
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