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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 CLP ($) | Dec. 31, 2023 CLP ($) | Dec. 31, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |
Percentage of inflation | 4.40% | 4.80% | 4.80%
Revenue of operating segments, percentage | 10.00% |  |
Profit or loss, percentage | 10.00% |  |
Percentage of combined assets operating segments | 10.00% |  |
Foreign exchange rate | $ 992 | $ 884.59 | $ 860
Average incremental interest rate | 1.44% |  |
Useful life measured as period of time, intangible assets other than goodwill | 36 months |  |
PD equal percentage | 100.00% |  |
Average cost to sale, percentage | 5.67% | 5.80% | 5.80%
Net income, percentage | 30.00% |  |
Terms of employee benefits | 60 years |  |
Expected Credit Losses |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
PD equal percentage | 100.00% |  |
CLF |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Foreign exchange rate | 38,416.69 | 36,789.36 | 36,789.36
Banco Santander Spain | Banco Santander-Chile |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 99.80% |  |
Banco Santander Spain | Teatinos Siglo XXi inversiones Ltda |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% |  |
Banco Santander Spain | Santander-Chile Bank |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 67.18% |  |

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