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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
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