RISK MANAGEMENT - Investment price risk in equity instruments (Details) - Equity investments - Investment securities at fair value [member] - Financial assets at fair value through profit or loss, classified as held for trading, category [member] - COP ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial assets [line items]
Investment subject to Regulatory VaR	$ 85,229	$ 85,832
Regulatory VaR	$ 12,529	$ 12,617
Percentage of Portfolio subject to VaR	100.00%	100.00%
More than 36 months [member]
Disclosure of financial assets [line items]
Investment subject to Regulatory VaR	$ 85,229	$ 85,832
Regulatory VaR	$ 12,529	$ 12,617
Percentage of Portfolio subject to VaR	100.00%	100.00%