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Derivatives - Risk exposures that will be affected by interest rate benchmark reform (Details) - Interest rate risk - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fair value hedging | EURIBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | £ 15,100
Hedged adjustment |  | 27
Fair value hedging | GBP LIBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 11,400
Hedged adjustment |  | 1,178
Fair value hedging | USD IBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount | £ 21,800 | 28,100
Hedged adjustment | 7 | (427)
Fair value hedging | Other IBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 1,100
Hedged adjustment |  | 1
Cash flow hedging | EURIBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 4,100
Hedged adjustment |  | (76)
Cash flow hedging | GBP LIBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 10,500
Hedged adjustment |  | (473)
Cash flow hedging | USD IBOR |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount | 3,300 | 2,700
Hedged adjustment | 21 | (61)
Cash flow hedging | BOE Base rate |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 40,700
Hedged adjustment |  | (156)
Cash flow hedging | ECB REFI rate |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 1,200
Cash flow hedging | SONIA |  |
Disclosure of detailed information about hedged items [line items] |  |
Notional amount |  | 600
Hedged adjustment |  | £ 4
Notional amount, convertible to repricing | £ 6,500 |

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