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Financial instruments: valuation - Movement in Level 3 portfolios - Liabilities (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Movement in level 3 liabilities |  |
Liabilities at beginning of period | £ 236,157 |
Liabilities at end of period | 167,807 | £ 236,157
Level 3 |  |
Movement in level 3 liabilities |  |
Liabilities at beginning of period | 894 |
Liabilities at end of period | 609 | 894
Leveraged finance loan | 450 |
Level 3 | Other operating income and interest income |  |
Movement in level 3 liabilities |  |
Net gain (loss) on trading assets and liabilities recorded in income from trading activities |  | (194)
Level 3 | Income from trading activities |  |
Movement in level 3 liabilities |  |
Net gain (loss) on trading assets and liabilities recorded in income from trading activities | 3 |
Recurring | Level 3 |  |
Movement in level 3 liabilities |  |
Liabilities at beginning of period | 894 | 1,317
Amounts recorded in the income statement | (90) | (67)
Level 3 transfers in | 20 | 188
Level 3 transfers out | (168) | (368)
Purchases/Originations | 305 | 127
Settlements/Other decreases | (28) | (59)
Sales | (321) | (245)
Foreign exchange and other adjustments | (3) | 1
Liabilities at end of period | 609 | 894
Recurring | Level 3 | Financial liabilities |  |
Movement in level 3 liabilities |  |
Amounts recorded in the income statement in respect of balances held at year end - unrealised | £ (90) | £ (68)

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- Definition The gains (losses) recognised in profit or loss for liabilities measured at fair value that are attributable to the change in unrealised gains or losses relating to those liabilities held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_f&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase in the fair value measurement of liabilities resulting from purchases of those liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease in the fair value measurement of liabilities resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2021-03-24 + Details
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