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Derivatives - Summary of derivatives held for hedging (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivatives |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative assets | £ 99,545 | £ 106,139 |
Net hedging derivative liabilities | £ 94,047 | £ 100,835 |
Exchange rate contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 3,168,000 | 3,167,000 |
Net hedging derivative assets | £ 45,829 | £ 38,517 |
Net hedging derivative liabilities | £ 45,237 | £ 39,286 |
Interest rate Contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 10,742,000 | 8,919,000 |
Net hedging derivative assets | £ 53,480 | £ 67,458 |
Net hedging derivative liabilities | £ 48,535 | £ 61,206 |
Credit derivatives |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 15,000 | 14,000 |
Net hedging derivative assets | £ 236 | £ 154 |
Net hedging derivative liabilities | £ 275 | 343 |
Equity and commodity contracts |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative assets |  | £ 10 |
Derivatives held for hedging before IFRS netting | Derivatives |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 233,100 | 206,500 |
Net hedging derivative assets | £ 4,378 | £ 2,169 |
Net hedging derivative liabilities | 9,337 | 3,316 |
Changes in fair value used for hedge ineffectiveness | (2,859) |  |
IFRS netting/Clearing house settlements |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative assets | (4,235) | (2,125) |
Net hedging derivative liabilities | (9,205) | (3,196) |
Derivatives after IFRS netting |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative assets | 143 | 44 |
Net hedging derivative liabilities | 132 | 120 |
Derivatives |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative liabilities | 132 | 120 |
Fair value hedging |  |  |
Fair value of the hedging derivative |  |  |
Changes in fair value used for hedge ineffectiveness | £ (442) | £ (846) | £ 877
Fair value hedging | Interest rate Contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 58,700 | 65,600 |
Net hedging derivative assets | £ 1,554 | £ 1,176 |
Net hedging derivative liabilities | 3,009 | 2,057 |
Changes in fair value used for hedge ineffectiveness | £ 482 | £ 897 |
Cash flow hedging | Exchange rate contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 6,300 | 7,300 |
Net hedging derivative assets | £ 142 | £ 30 |
Net hedging derivative liabilities | 112 | 109 |
Changes in fair value used for hedge ineffectiveness | £ (3) | £ 27 |
Cash flow hedging | Interest rate Contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 167,600 | 133,100 |
Net hedging derivative assets | £ 2,681 | £ 952 |
Net hedging derivative liabilities | 6,207 | 1,149 |
Changes in fair value used for hedge ineffectiveness | £ (3,342) | £ (931) |
Net investment hedging | Exchange rate contracts |  |  |
Fair value of the hedging derivative |  |  |
Notional amount | 500 | 500 |
Net hedging derivative assets | £ 1 | £ 11 |
Net hedging derivative liabilities | 9 | 1 |
Changes in fair value used for hedge ineffectiveness | 4 | 7 |
Derivatives |  |  |
Fair value of the hedging derivative |  |  |
Net hedging derivative assets | £ 143 | £ 44 |

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- Definition The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of derivative financial liabilities held for hedging. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2022-03-24 + Details
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