RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Other accounts receivable at amortized cost - Evaluated using general approach - By segment (Details) - COP ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [line items]
Financial assets	$ 280,746,878	$ 274,682,875
Financial assets at amortised cost, category [member]
Disclosure of financial assets [line items]
Financial assets	236,970,165	235,373,468
Other accounts receivable at amortized cost [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	22,171,973	20,255,758
Other accounts receivable at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	22,171,973	20,255,758
Other accounts receivable at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	15,713,547	14,315,166
Other accounts receivable at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	119,607	145,724
Other accounts receivable at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	186,364	181,992
Other accounts receivable, general approach, other accounts receivables related to gas, energy services, contributions and others | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	1,447,984	1,411,809
Other accounts receivable, general approach, other accounts receivables related to gas, energy services, contributions and others | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	1,143,548	1,084,093
Other accounts receivable, general approach, other accounts receivables related to gas, energy services, contributions and others | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	119,607	145,724
Other accounts receivable, general approach, other accounts receivables related to gas, energy services, contributions and others | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	184,829	181,992
Other accounts receivable, general approach, other accounts receivables related to contributions [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	88,148	151,923
Other accounts receivable, general approach, other accounts receivables related to contributions [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	88,148	151,923
Other accounts receivable, general approach, other accounts receivables related to gas [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	923,285	923,220
Other accounts receivable, general approach, other accounts receivables related to gas [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	709,422	692,169
Other accounts receivable, general approach, other accounts receivables related to gas [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	111,786	141,218
Other accounts receivable, general approach, other accounts receivables related to gas [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	102,077	89,833
Other accounts receivable, general approach, other accounts receivables related to energy services [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	175,533	175,282
Other accounts receivable, general approach, other accounts receivables related to energy services [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	84,960	78,617
Other accounts receivable, general approach, other accounts receivables related to energy services [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	7,821	4,506
Other accounts receivable, general approach, other accounts receivables related to energy services [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]
Disclosure of financial assets [line items]
Financial assets	82,752	92,159
Other accounts receivable, general approach, other accounts receivables related to others [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]
Disclosure of financial assets [line items]
Financial assets	261,018	161,384
Other accounts receivable, general approach, other accounts receivables related to others [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member]
Disclosure of financial assets [line items]
Financial assets	$ 261,018	$ 161,384