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Equity (Details 1) - shares | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 163,624,085,523 | 161,960,126,723 | 157,207,260,723 |
American Depository Receipts (ADR) | [1] | 24,822,041,271 | 26,486,000,071 | 31,238,866,071 |
Total |  | 188,446,126,794 | 188,446,126,794 | 188,446,126,794 | 188,446,126,794
Percentage of equity holding |  | 100.00% | 100.00% | 100.00% |
Santander Chile Holding S.A. [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 66,822,519,695 | 66,822,519,695 | 66,822,519,695 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 66,822,519,695 | 66,822,519,695 | 66,822,519,695 |
Percentage of equity holding |  | 35.46% | 35.46% | 35.46% |
Teatinos Siglo XXI Inversiones Limitada [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 59,770,481,573 | 59,770,481,573 | 59,770,481,573 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 59,770,481,573 | 59,770,481,573 | 59,770,481,573 |
Percentage of equity holding |  | 31.72% | 31.72% | 31.72% |
The Bank New York Mellon [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  |  |  |  |
American Depository Receipts (ADR) | [1] | 24,822,041,271 | 26,486,000,071 | 31,238,866,071 |
Total |  | 24,822,041,271 | 26,486,000,071 | 31,238,866,071 |
Percentage of equity holding |  | 13.17% | 14.05% | 16.58% |
Banks On Behalf Of Third Parties [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 15,957,137,883 | 15,451,106,985 | 13,892,691,988 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 15,957,137,883 | 15,451,106,985 | 13,892,691,988 |
Percentage of equity holding |  | 8.47% | 8.20% | 7.37% |
Pension Funds (AFP) On Behalf Of Third Parties [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 9,995,705,956 | 9,033,172,896 | 6,896,552,755 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 9,995,705,956 | 9,033,172,896 | 6,896,552,755 |
Percentage of equity holding |  | 5.30% | 4.79% | 3.66% |
Stock Brokers On Behalf Of Third Parties [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 5,551,024,270 | 4,773,558,507 | 3,762,310,365 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 5,551,024,270 | 4,773,558,507 | 3,762,310,365 |
Percentage of equity holding |  | 2.95% | 2.53% | 2.00% |
Other Minority Holders [Member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Shares |  | 5,527,216,146 | 6,109,287,067 | 6,062,704,347 |
American Depository Receipts (ADR) | [1] |  |  |  |
Total |  | 5,527,216,146 | 6,109,287,067 | 6,062,704,347 |
Percentage of equity holding |  | 2.93% | 3.25% | 3.21% |
[1] | American Depository Receipts (ADR) are certificates issued by a U.S. commercial bank to be traded on the U.S. securities markets.

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