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Financial instruments - valuation - Liabilities at Amortised Cost (Details) - GBP (£) £ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair value of liabilities
Financial Liabilities	£ 688,802	£ 668,607
Amortised cost
Fair value of liabilities
Financial Liabilities	556,148	534,112
Deposits by banks
Fair value of liabilities
Financial Liabilities	38,148	31,452
Deposits by banks | Amortised cost
Fair value of liabilities
Financial Liabilities	38,148	31,452
Customer deposits
Fair value of liabilities
Financial Liabilities	436,756	433,490
Customer deposits | Amortised cost
Fair value of liabilities
Financial Liabilities	436,756	433,490
Settlement balances liabilities
Fair value of liabilities
Financial Liabilities	9,546	1,729
Settlement balances liabilities | Amortised cost
Fair value of liabilities
Financial Liabilities	9,546	1,729
Financial liabilities (other)
Fair value of liabilities
Financial Liabilities	65,940	61,087
Financial liabilities (other) | Amortised cost
Fair value of liabilities
Financial Liabilities	62,013	57,539
Debt securities in issue | Amortised cost
Fair value of liabilities
Financial Liabilities	62,000	57,500
Financial liabilities, subordinated
Fair value of liabilities
Financial Liabilities	6,006	6,136
Financial liabilities, subordinated | Amortised cost
Fair value of liabilities
Financial Liabilities	5,772	5,902
Notes in circulation
Fair value of liabilities
Financial Liabilities	3,287	3,316
Notes in circulation | Amortised cost
Fair value of liabilities
Financial Liabilities	3,287	3,316
Items where fair value approximates carrying value | Deposits by banks | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	4,600	4,300
Items where fair value approximates carrying value | Customer deposits | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	366,100	363,000
Items where fair value approximates carrying value | Settlement balances liabilities | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	9,500	1,700
Items where fair value approximates carrying value | Notes in circulation | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	3,300	3,300
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	38,000	31,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Level 2 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	29,700	23,900
Not measured at fair value in statement of financial position but for which fair value is disclosed | Deposits by banks | Level 3 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	3,700	3,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	436,700	433,300
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Level 2 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	24,200	24,300
Not measured at fair value in statement of financial position but for which fair value is disclosed | Customer deposits | Level 3 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	46,400	46,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Settlement balances liabilities | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	9,500	1,700
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	62,700	57,600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Level 2 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	54,000	48,900
Not measured at fair value in statement of financial position but for which fair value is disclosed | Debt securities in issue | Level 3 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	8,700	8,700
Not measured at fair value in statement of financial position but for which fair value is disclosed | Financial liabilities, subordinated | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	5,900	6,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Financial liabilities, subordinated | Level 2 | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	5,900	6,000
Not measured at fair value in statement of financial position but for which fair value is disclosed | Notes in circulation | Amortised cost
Fair value of liabilities
Fair value, Financial Liabilities	3,300	3,300
At fair value
Fair value of liabilities
Fair value, Financial Liabilities	128,989	130,578
At fair value | Level 1
Fair value of liabilities
Fair value, Financial Liabilities	9,749	8,766
At fair value | Level 2
Fair value of liabilities
Fair value, Financial Liabilities	118,842	121,318
At fair value | Level 3
Fair value of liabilities
Fair value, Financial Liabilities	398	494	£ 686	£ 691
At fair value | Financial liabilities (other) | Level 3
Fair value of liabilities
Fair value, Financial Liabilities	55	28	£ 26	£ 3
At fair value | Financial liabilities, subordinated
Fair value of liabilities
Fair value, Financial Liabilities	234	234
At fair value | Financial liabilities, subordinated | Level 2
Fair value of liabilities
Fair value, Financial Liabilities	£ 234	£ 234

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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