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Derivatives - Analysis of cash flow reserve and foreign exchange reserve (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedged items [line items] |  |
Pre-tax cash flow hedge reserve | £ (3,837) | £ (559)
Pre-tax foreign exchange hedge reserve | (965) | (706)
Amount recognised in equity, cash flow hedges | (2,973) | (687)
Amount recognised in equity, foreign exchange hedge reserve | (266) | 88
Amount transferred from equity to earnings, cash flow hedges | 304 | 161
Amount transferred from equity to earnings, foreign exchange hedge reserve | (7) |
Interest rate risk |  |
Disclosure of detailed information about hedged items [line items] |  |
Continuing cash flow hedge reserve | (3,576) | (295)
De-designated cash flow hedge reserve | (297) | (297)
Amount recognised in equity, cash flow hedges | (2,997) | (700)
Amount recognised in equity, foreign exchange hedge reserve | (64) |
Interest rate risk | Net interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | 252 | 181
Interest rate risk | Non interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | 21 | (20)
Interest rate risk | Operating expenses |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | (14) |
Exchange rate risk |  |
Disclosure of detailed information about hedged items [line items] |  |
Continuing cash flow hedge reserve | 16 | 23
Continuing foreign exchange hedge reserve | (85) | 53
De-designated cash flow hedge reserve | 20 | 10
De-designated foreign exchange hedge reserve | (880) | (759)
Amount recognised in equity, cash flow hedges | 24 | 13
Amount recognised in equity, foreign exchange hedge reserve | (202) | 88
Exchange rate risk | Net interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | 29 | 4
Amount transferred from equity to earnings, foreign exchange hedge reserve |  | (2)
Exchange rate risk | Non interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | (15) | (1)
Amount transferred from equity to earnings, foreign exchange hedge reserve | (7) | 2
Exchange rate risk | Operating expenses |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedges | £ 3 | £ (3)

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_b&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 23 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_c&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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- Definition The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, before tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 39 -IssueDate 2022-03-24 -Paragraph 102 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=39&code=ifrs-tx-2022-en-r&anchor=para_102_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_b&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2022-03-24 -Paragraph 6.5.13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2022-en-r&anchor=para_6.5.13_a&doctype=Standard -URIDate 2022-03-24 + Details
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