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Derivatives - Analysis of cash flow reserve and foreign exchange reserve (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about hedged items [line items] |  |
Continuing cash flow hedge reserve | £ (559) | £ 292
Continuing foreign exchange hedge reserve | (706) | (788)
Cash flow hedge reserve, amount recognised in equity | (687) | 321
Foreign exchange hedge reserve, amount recognised in equity | 88 | (57)
Amount transferred from equity to earnings, cash flow hedge reserve | (161) | (50)
Amount transferred from equity to earnings, foreign exchange hedge reserve |  | 2
Interest rate risk |  |
Disclosure of detailed information about hedged items [line items] |  |
Continuing cash flow hedge reserve | (295) | 695
De-designated cash flow hedge reserve | (297) | (424)
Cash flow hedge reserve, amount recognised in equity | (700) | 318
Interest rate risk | Net interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedge reserve | (181) | (19)
Interest rate risk | Non interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedge reserve | 20 |
Exchange rate risk |  |
Disclosure of detailed information about hedged items [line items] |  |
Continuing cash flow hedge reserve | 23 | 22
Continuing foreign exchange hedge reserve | 53 | (13)
De-designated cash flow hedge reserve | 10 | (1)
De-designated foreign exchange hedge reserve | (759) | (775)
Cash flow hedge reserve, amount recognised in equity | 13 | 3
Foreign exchange hedge reserve, amount recognised in equity | 88 | (57)
Exchange rate risk | Net interest income |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedge reserve | (4) | (35)
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 hedge reserve | 1 |
Amount transferred from equity to earnings, foreign exchange hedge reserve | (2) | 2
Exchange rate risk | Operating expenses |  |
Disclosure of detailed information about hedged items [line items] |  |
Amount transferred from equity to earnings, cash flow hedge reserve | £ 3 | £ 4

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- Definition The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_92&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_iv&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_d&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition The amount of reclassification adjustments related to hedges of net investments in foreign operations, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_92&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 39 -IssueDate 2021-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=39&code=ifrs-tx-2021-en-r&anchor=para_102&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_iv&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2021-01-01 -Paragraph 6.5.14 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2021-en-r&anchor=para_6.5.14&doctype=Standard -URIDate 2021-03-24 + Details
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