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Risk Management (Details) - Schedule of Fair Value of Derivative Instruments - Financial Derivative Contracts $ in Millions	12 Months Ended
	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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+ References

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- Definition

Schedule of Fair Value of Derivative Instruments [Line Items]

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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

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