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RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Investments in debt securities at FVOCI (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 280,746,878 $ 274,682,875
Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of financial assets [line items]    
Financial assets 23,326,776 22,461,805
Investment securities at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets 24,446,014 23,939,915
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of financial assets [line items]    
Financial assets 23,326,776 22,461,805
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 18,659,060 17,993,586
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 4,491,773 4,435,264
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 175,943 32,955
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member]    
Disclosure of financial assets [line items]    
Financial assets 23,326,776 22,461,805
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 18,659,060 17,993,586
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 4,491,773 4,435,264
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 175,943 32,955
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 16,879,453 16,247,220
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 2,418,378 2,702,107
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 16,879,453 16,247,220
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 2,418,378 2,702,107
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 123,996 109,246
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 739,792 680,002
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 123,996 109,246
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 739,792 680,002
Central Banks | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 145,489 194,098
Central Banks | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 145,489 194,098
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 93,637 124,587
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 273,144 245,734
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 175,943  
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 93,637 124,587
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 273,144 245,734
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 175,943  
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 1,085,737 840,545
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 1,056,910 782,359
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets   32,955
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 1,085,737 840,545
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 1,056,910 782,359
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets   32,955
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 330,748 477,890
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 3,549 25,062
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 330,748 477,890
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets $ 3,549 $ 25,062