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Financial Instruments - classification - IBOR reform (Details) - GBP (£) £ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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IBOR reform |  |
Financial instruments by type of interest rate |  |
Loan commitments |  | £ 7,437
Other IBOR |  |
Financial instruments by type of interest rate |  |
Loan commitments |  | 55
GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Loan commitments |  | 1,016
USD IBOR |  |
Financial instruments by type of interest rate |  |
Loan commitments |  | 6,366
Bank deposits |  |
Financial instruments by type of interest rate |  |
Financial Liabilities | £ 20,441 | 26,279
Bank deposits | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 37
Bank deposits | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 37
Trading liabilities. | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 197
Trading liabilities. | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 31
Trading liabilities. | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 166
Other financial liabilities |  |
Financial instruments by type of interest rate |  |
Financial Liabilities | 49,107 | 49,326
Other financial liabilities | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 9,544
Other financial liabilities | Other IBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 131
Other financial liabilities | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 2,390
Other financial liabilities | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 7,023
Subordinated Liabilities | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 90
Subordinated Liabilities | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Liabilities |  | 90
Trading assets. | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 152
Trading assets. | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 62
Trading assets. | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 90
Loans to banks - amortised cost. | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 11
Loans to banks - amortised cost. | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 11
Loans to customers - amortised cost. | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 9,620
Loans to customers - amortised cost. | Other IBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 267
Loans to customers - amortised cost. | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 4,788
Loans to customers - amortised cost. | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 4,565
Other financial assets |  |
Financial instruments by type of interest rate |  |
Financial Assets | £ 30,895 | 46,145
Other financial assets | IBOR reform |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 1,632
Other financial assets | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 864
Other financial assets | USD IBOR |  |
Financial instruments by type of interest rate |  |
Financial Assets |  | 768
Derivatives [Member] | IBOR reform |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 1,156,000
Derivatives [Member] | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 4,000
Derivatives [Member] | USD IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 1,152,000
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | Other IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 500
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 8,700
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | USD IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 8,200
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | Other IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 25,300
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 91,700
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | USD IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 117,000
Currency swaps of Other IBOR with USD IBOR | Other IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 400
Currency swaps of Other IBOR with USD IBOR | GBP LIBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 100
Currency swaps of Other IBOR with USD IBOR | EUR IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | 100
Currency swaps of Other IBOR with USD IBOR | USD IBOR |  |
Financial instruments by type of interest rate |  |
Derivatives notional (£bn) |  | £ 400

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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 2022-03-24 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35M&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I&doctype=Standard -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
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