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Financial instruments: valuation - Assets at Amortised Cost (Details) - GBP (£) £ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financial liabilities (other) |  |
Fair value of assets |  |
Carrying value, Financial liabilities | £ 55,089 | £ 49,107
Cash and balances at central banks |  |
Fair value of assets |  |
Financial Assets | 104,262 | 144,832
Cash and balances at central banks | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets | 104,300 | 144,800
Settlement balances | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets | 7,200 | 2,600
Loans to banks - amortised cost | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets | 6,914 | 7,139
Loans to customers - amortised cost | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets | 381,433 | 366,340
Other financial assets - securities | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets | 21,700 | 13,100
Items where fair value approximates carrying value | Cash and balances at central banks | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 104,300 | 144,800
Items where fair value approximates carrying value | Settlement balances | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 7,200 | 2,600
Items where fair value approximates carrying value | Loans to banks - amortised cost | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 4,200 | 100
Not measured at fair value in statement of financial position but for which fair value is disclosed | Cash and balances at central banks | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 104,300 | 144,800
Not measured at fair value in statement of financial position but for which fair value is disclosed | Settlement balances | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 7,200 | 2,600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 7,000 | 7,100
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Level 2 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 2,200 | 4,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to banks - amortised cost | Level 3 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 600 | 2,800
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 373,200 | 354,500
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Level 2 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 27,500 | 20,300
Not measured at fair value in statement of financial position but for which fair value is disclosed | Loans to customers - amortised cost | Level 3 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 345,700 | 334,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 21,600 | 12,800
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 1 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 4,000 | 3,600
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 2 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | 6,600 | 3,200
Not measured at fair value in statement of financial position but for which fair value is disclosed | Other financial assets - securities | Level 3 | Financial assets at amortised cost |  |
Fair value of assets |  |
Financial Assets, at fair value | £ 11,000 | £ 6,000

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35M&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35N&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35I&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition 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: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 + Details
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