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Provisions for employees' benefits - Net of post-employment benefits (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Liabilities for employee benefits    
Opening balance $ 29,161,475 $ 22,305,172
Current service cost 208,547 115,031
Past service cost 216,993 107,231
Interest expense 2,091,621 2,018,236
Actuarial (gains) losses (1,817,864) 6,452,059
Benefits paid (1,974,551) (1,813,283)
Foreign currency translation (25,327) (22,971)
Closing balance 27,860,894 29,161,475
Plan assets    
Opening balance 12,011,267 10,398,810
Return on assets 849,964 929,987
Contributions to funds 163,629 149,168
Benefits paid (1,350,445) (1,235,464)
Actuarial gains (losses) 56,361 1,768,766
Closing balance 11,730,776 12,011,267
Net post-employment benefits liability 16,130,118 17,150,208
Pension and bonds    
Liabilities for employee benefits    
Opening balance 16,411,708 12,840,148
Current service cost 34,132 20,583
Past service cost 0 0
Interest expense 1,163,282 1,152,125
Actuarial (gains) losses (1,519,800) 3,560,843
Benefits paid (1,232,066) (1,140,003)
Foreign currency translation (25,989) (21,988)
Closing balance 14,831,267 16,411,708
Plan assets    
Opening balance 11,973,967 10,367,472
Return on assets 848,103 928,278
Contributions to funds 0 0
Benefits paid (1,182,824) (1,085,236)
Actuarial gains (losses) 53,762 1,763,453
Closing balance 11,693,008 11,973,967
Net post-employment benefits liability 3,138,259 4,437,741
Other    
Liabilities for employee benefits    
Opening balance 12,749,767 9,465,024
Current service cost 174,415 94,448
Past service cost 216,993 107,231
Interest expense 928,339 866,111
Actuarial (gains) losses (298,064) 2,891,216
Benefits paid (742,485) (673,280)
Foreign currency translation 662 (983)
Closing balance 13,029,627 12,749,767
Plan assets    
Opening balance 37,300 31,338
Return on assets 1,861 1,709
Contributions to funds 163,629 149,168
Benefits paid (167,621) (150,228)
Actuarial gains (losses) 2,599 5,313
Closing balance 37,768 37,300
Net post-employment benefits liability $ 12,991,859 $ 12,712,467