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Derivatives - Derivatives in hedge accounting relationships (Details) £ in Millions	12 Months Ended
	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 GBP (£)	Dec. 31, 2021 GBP (£)
IFRS netting
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	£ (3,063)	£ (4,235)
Hedging instrument, liabilities	(7,568)	(9,205)
Derivatives after IFRS netting
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	114	143
Hedging instrument, liabilities	£ 270	£ 132
Derivatives | Derivatives before IFRS netting
Disclosure of detailed information about hedging instruments [line items]
Notional amount	224,800	233,100
Hedging instrument, assets	£ 3,177	£ 4,378
Hedging instrument, liabilities	7,838	9,337
Changes in fair value used for hedge ineffectiveness	1,602	(2,859)
Fair value hedging
Disclosure of detailed information about hedging instruments [line items]
Changes in fair value used for hedge ineffectiveness	£ 406	£ 482	£ 897
Fair value hedging | Interest rate derivatives
Disclosure of detailed information about hedging instruments [line items]
Notional amount	67,600	58,700
Hedging instrument, assets	£ 1,139	£ 1,554
Hedging instrument, liabilities	2,607	3,009
Changes in fair value used for hedge ineffectiveness	£ 406	£ 482
Cash flow hedging | Interest rate derivatives
Disclosure of detailed information about hedging instruments [line items]
Notional amount	140,000	167,600
Hedging instrument, assets	£ 1,924	£ 2,681
Hedging instrument, liabilities	4,970	6,207
Changes in fair value used for hedge ineffectiveness	£ 1,211	£ (3,342)
Cash flow hedging | Exchange rate derivatives
Disclosure of detailed information about hedging instruments [line items]
Notional amount	16,900	6,300
Hedging instrument, assets	£ 112	£ 142
Hedging instrument, liabilities	254	112
Changes in fair value used for hedge ineffectiveness	£ (12)	£ (3)
Net investment hedging | Exchange rate derivatives
Disclosure of detailed information about hedging instruments [line items]
Notional amount	300	500
Hedging instrument, assets	£ 2	£ 1
Hedging instrument, liabilities	7	9
Changes in fair value used for hedge ineffectiveness	£ (3)	£ 4

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24A
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_c&doctype=Standard
-URIDate 2023-03-23

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- Definition

The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]]

+ References

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The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]]

+ References

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- Definition

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+ References

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