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Risk Management (Details) - Schedule of Fair Value of Derivative Instruments - Financial Derivative Contracts $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) classification
Santander Bank Hong Kong | Credit risk |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Classification | classification | 2
Maximum exposure to credit risk | $ 8
Santander Bank Hong Kong | Credit risk | Derivative instruments (market adjusted) |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander Bank Hong Kong | Credit risk | Deposits |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 1
Santander Bank Hong Kong | Credit risk | Financial Investments |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander Bank Hong Kong | Currency risk | Loans |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | $ 7
Santander Bank Mexico | Credit risk |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Classification | classification | 3
Maximum exposure to credit risk | $ 2
Santander Bank Mexico | Credit risk | Derivative instruments (market adjusted) |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 2
Santander Bank Mexico | Credit risk | Deposits |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander Bank Mexico | Credit risk | Financial Investments |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander Bank Mexico | Currency risk | Loans |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | $ 0
Santander Bank EEUU | Credit risk |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Classification | classification | 1
Maximum exposure to credit risk | $ 167
Santander Bank EEUU | Credit risk | Derivative instruments (market adjusted) |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 37
Santander Bank EEUU | Credit risk | Deposits |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 130
Santander Bank EEUU | Credit risk | Financial Investments |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander Bank EEUU | Currency risk | Loans |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | $ 0
Santander UK PLC | Credit risk |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Classification | classification | 1
Maximum exposure to credit risk | $ 2
Santander UK PLC | Credit risk | Derivative instruments (market adjusted) |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander UK PLC | Credit risk | Deposits |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 2
Santander UK PLC | Credit risk | Financial Investments |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Santander UK PLC | Currency risk | Loans |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | $ 0
Banco Santander España | Credit risk |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Classification | classification | 1
Maximum exposure to credit risk | $ 6
Banco Santander España | Credit risk | Derivative instruments (market adjusted) |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 1
Banco Santander España | Credit risk | Deposits |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 5
Banco Santander España | Credit risk | Financial Investments |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | 0
Banco Santander España | Currency risk | Loans |
Schedule of Fair Value of Derivative Instruments [Line Items] |
Maximum exposure to credit risk | $ 0

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- Definition Schedule of Fair Value of Derivative Instruments [Line Items] + References No definition available. + Details
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2024-03-27 + Details
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