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Taxes - Deferred tax assets and liabilities not recognized in subsidiaries (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised $ 196,543 $ 351,203
Deferred tax assets are not recognized, Base amount 90,771  
Deferred tax assets are not recognized, Tax 13,616  
Ruta del Bosque (Chile)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 107,006 100,356
Ruta del Maule (Chile)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised   36,138
ISA Interconexiones Viales    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 2,926 3,094
ISA Inversiones Costeras Chile    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 37,345 39,221
ISA Inversiones Chile Ltda    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 18,935 39,161
ISA Intervial Colombia    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 528 542
ISA Capital do Brasil    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 19,072 17,093
Internexa Brasil Operadora de Telecomunicaes    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 95,226 95,226
Internexa Participaes (Brasil)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 2,641 2,579
ISA Bolivia    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 7,867 4,934
ISA Inversiones Tolten    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 18 $ 12,859
Ruta Costera    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised $ 391