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Provisions for employees' benefits - Net of post-employment benefits (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Liabilities for employee benefits    
Opening balance $ 22,305,172 $ 22,467,519
Current service cost 115,031 95,724
Past service cost 107,231 165,918
Interest expense 2,018,236 1,483,628
Actuarial (gains) losses 6,452,059 (444,099)
Benefits paid (1,813,283) (1,589,670)
Foreign currency translation (22,971) 126,152
Closing balance 29,161,475 22,305,172
Plan assets    
Opening balance 10,398,810 12,068,525
Return on assets 929,987 804,530
Contributions to funds 149,168 125,788
Benefits paid (1,235,464) (1,087,060)
Actuarial gains (losses) 1,768,766 (1,512,973)
Closing balance 12,011,267 10,398,810
Net post-employment benefits liability 17,150,208 11,906,362
Pension and bonds    
Liabilities for employee benefits    
Opening balance 12,840,148 14,520,592
Current service cost 20,583 0
Past service cost 0 51,756
Interest expense 1,152,125 953,146
Actuarial (gains) losses 3,560,843 (1,805,907)
Benefits paid (1,140,003) (981,486)
Foreign currency translation (21,988) 102,047
Closing balance 16,411,708 12,840,148
Plan assets    
Opening balance 10,367,472 12,040,229
Return on assets 928,278 802,711
Contributions to funds 0 0
Benefits paid (1,085,236) (961,931)
Actuarial gains (losses) 1,763,453 (1,513,537)
Closing balance 11,973,967 10,367,472
Net post-employment benefits liability 4,437,741 2,472,676
Other    
Liabilities for employee benefits    
Opening balance 9,465,024 7,946,927
Current service cost 94,448 95,724
Past service cost 107,231 114,162
Interest expense 866,111 530,482
Actuarial (gains) losses 2,891,216 1,361,808
Benefits paid (673,280) (608,184)
Foreign currency translation (983) 24,105
Closing balance 12,749,767 9,465,024
Plan assets    
Opening balance 31,338 28,296
Return on assets 1,709 1,819
Contributions to funds 149,168 125,788
Benefits paid (150,228) (125,129)
Actuarial gains (losses) 5,313 564
Closing balance 37,300 31,338
Net post-employment benefits liability $ 12,712,467 $ 9,433,686