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Derivatives - Hedge ineffectiveness recognised (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about hedged items
Hedging ineffectiveness	£ 25	£ 24	£ 48
Fair value hedging
Disclosure of detailed information about hedged items
(Losses)/gains on hedged items attributable to the hedged risk	(846)	877	610
Gains/(losses) on the hedging instruments	897	(875)	(585)
Hedging ineffectiveness	51	2	25
Cash flow hedging
Disclosure of detailed information about hedged items
Hedging ineffectiveness	(26)	22	23
Cash flow hedging | Interest rate risk
Disclosure of detailed information about hedged items
Hedging ineffectiveness	£ (26)	£ 22	£ 23

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- Definition

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- Definition

The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

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The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

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The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

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