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Analysis of cash and cash equivalents (Details) € in Millions, £ in Millions | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 GBP (£)
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Analysis of cash and cash equivalents |  |  |  |  |  |  |
Cash and bank balances at central banks | £ 104,262 |  | £ 144,832 |  | £ 177,757 |  |
Trading assets | 8,851 |  | 8,551 |  | 7,137 |  |
Other financial assets | 139 |  | 19 |  | 16 |  |
Loans to banks | 5,572 |  | 5,047 |  | 5,796 |  |
Total cash and cash equivalents | 118,824 |  | 158,449 |  | 190,706 |  | £ 139,199
Cash collateral posted with bank counterparties | 4,434 |  | 4,895 |  | 4,293 |  |
NWM N.V. |  |  |  |  |  |  |
Analysis of cash and cash equivalents |  |  |  |  |  |  |
Mandatory reserve deposits at central banks | € |  | € 132 |  | € 64 |  | € 60 |
Royal Bank of Scotland International Limited |  |  |  |  |  |  |
Analysis of cash and cash equivalents |  |  |  |  |  |  |
Mandatory reserve deposits at central banks | £ 135 |  | £ 108 |  | £ 123 |  |

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- Definition The amount of cash and bank balances held at central banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of reserve that is kept in deposit at a central bank to fulfil regulatory reserve requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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