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Provisions for employees' benefits - Credit ratings of the issuers and counterparties in assets (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans    
Plan assets, at fair value $ 11,730,776 $ 12,011,267
AAA    
Disclosure of defined benefit plans    
Plan assets, at fair value 6,696,147 4,567,823
Nation    
Disclosure of defined benefit plans    
Plan assets, at fair value 4,292,768 4,037,150
AA+    
Disclosure of defined benefit plans    
Plan assets, at fair value 343,639 323,613
AA    
Disclosure of defined benefit plans    
Plan assets, at fair value 124,386 155,628
F1+    
Disclosure of defined benefit plans    
Plan assets, at fair value 45,233 64,624
BRC1+    
Disclosure of defined benefit plans    
Plan assets, at fair value 32,022 15,506
BB+    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 407,183
BBB-    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 164,034
BAA2    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 23,864
BBB+    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 24,796
AA-    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 18,836
BAA1    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 16,728
A+    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 9,499
A    
Disclosure of defined benefit plans    
Plan assets, at fair value 0 1,884
Other ratings    
Disclosure of defined benefit plans    
Plan assets, at fair value 114,539 985,554
Rating not available    
Disclosure of defined benefit plans    
Plan assets, at fair value $ 82,042 $ 1,194,545