Pension Plans - Narrative (Details) - CLP ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Pension Plans [Abstract]
Duties when turning over period	60 years
Plan assets	$ 3,462	$ 4,107

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

No definition available.

Name:	bsac_PlanAssetsAtFairValues
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant