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Taxes - Deferred tax assets and liabilities not recognized in subsidiaries (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised $ 351,203 $ 363,158
Ruta del Bosque (Chile)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 100,356 102,864
Ruta del Maule (Chile)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 36,138 43,702
ISA Interconexiones Viales    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 3,094  
ISA Inversiones Costeras Chile    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 39,221  
Internexa Chile    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 12,859  
ISA Inversiones Chile Ltda    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 39,161  
ISA Intervial Colombia    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 542 564
ISA Capital do Brasil    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 17,093 20,216
Internexa Brasil Operadora de Telecomunicaes    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 95,226 101,525
Internexa Participaes (Brasil)    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised 2,579 2,913
ISA Bolivia    
Disclosure of detailed information about income tax [Line Items]    
Deferred tax assets not recognised $ 4,934 $ 4,142