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Derivatives - Notional of hedging instruments affected by interest rate benchmark reform (Details) - GBP (£) £ in Billions | Dec. 31, 2021 | Dec. 31, 2020
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Fair value hedging | EUR IBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform |  | £ 13.6
Fair value hedging | GBP LIBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform |  | 11.2
Fair value hedging | USD IBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform | £ 20.2 | 26.6
Fair value hedging | Other currency |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform |  | 1.1
Cash flow hedging | EUR IBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform |  | 5.2
Cash flow hedging | GBP LIBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform |  | 51.7
Cash flow hedging | SOFR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform | 0.2 |
Cash flow hedging | USD IBOR |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount hedging instruments affected by interest rate benchmark reform | 3.1 | £ 2.7
Cash flow hedging | Risk free rate | Cross Currency |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount, convertible to repricing | £ 1.0 |

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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