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Provisions for employees' benefits - Credit ratings of the issuers and counterparties in assets (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans    
Plan assets, at fair value $ 12,011,267 $ 10,398,810
AAA    
Disclosure of defined benefit plans    
Plan assets, at fair value 4,567,823 4,138,043
Nation    
Disclosure of defined benefit plans    
Plan assets, at fair value 4,037,150 3,319,858
BB+    
Disclosure of defined benefit plans    
Plan assets, at fair value 407,183 267,961
AA+    
Disclosure of defined benefit plans    
Plan assets, at fair value 323,613 312,303
BBB-    
Disclosure of defined benefit plans    
Plan assets, at fair value 164,034 47,919
AA    
Disclosure of defined benefit plans    
Plan assets, at fair value 155,628 161,244
F1+    
Disclosure of defined benefit plans    
Plan assets, at fair value 64,624 87,111
BBB+    
Disclosure of defined benefit plans    
Plan assets, at fair value 24,796 30,331
BAA2    
Disclosure of defined benefit plans    
Plan assets, at fair value 23,864 20,880
AA-    
Disclosure of defined benefit plans    
Plan assets, at fair value 18,836 8,714
BAA1    
Disclosure of defined benefit plans    
Plan assets, at fair value 16,728 20,814
BRC1+    
Disclosure of defined benefit plans    
Plan assets, at fair value 15,506 43,000
A+    
Disclosure of defined benefit plans    
Plan assets, at fair value 9,499 23,514
A    
Disclosure of defined benefit plans    
Plan assets, at fair value 1,884 2,352
Other ratings    
Disclosure of defined benefit plans    
Plan assets, at fair value 985,554 414,681
Rating not available    
Disclosure of defined benefit plans    
Plan assets, at fair value $ 1,194,545 $ 1,500,085