Fair values of financial assets and liabilities - Movements in level 3 financial liabilities portfolio (Details) - Level 3 - GBP (£) £ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Reconciliation of changes in fair value measurement, liabilities [abstract]
Balance at beginning of period	£ 1,419	£ 1,415
Exchange and other adjustments	3	20
Gains recognised in the income statement within other income	(249)	195
Additions	202	2
Redemptions	(24)	(10)
Transfers into the level 3 portfolio	0	51
Transfers out of the level 3 portfolio	(43)	(159)
Balance at end of period	1,308	1,514
At fair value through profit or loss
Reconciliation of changes in fair value measurement, liabilities [abstract]
Balance at beginning of period	45	48
Exchange and other adjustments	0	0
Gains recognised in the income statement within other income	(2)	1
Additions	1	0
Redemptions	(5)	(2)
Transfers into the level 3 portfolio	0	0
Transfers out of the level 3 portfolio	0	0
Balance at end of period	39	47
Gains recognised in the income statement, within other income, relating to the change in fair value of those assets held at 30 June 2020	(2)	0
Derivative financial instruments
Reconciliation of changes in fair value measurement, liabilities [abstract]
Balance at beginning of period	1,374	1,367
Exchange and other adjustments	3	20
Gains recognised in the income statement within other income	(247)	194
Additions	201	2
Redemptions	(19)	(8)
Transfers into the level 3 portfolio	0	51
Transfers out of the level 3 portfolio	(43)	(159)
Balance at end of period	1,269	1,467
Gains recognised in the income statement, within other income, relating to the change in fair value of those assets held at 30 June 2020	(244)	195
Level 3 financial liabilities carried at fair value
Reconciliation of changes in fair value measurement, liabilities [abstract]
Gains recognised in the income statement, within other income, relating to the change in fair value of those assets held at 30 June 2020	£ (246)	£ 195

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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- Definition

The gains (losses) excluding exchange differences, recognised in profit or loss, on the fair value measurement of liabilities. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of other comprehensive income, net of tax, related to gains (losses) in relation to changes in the revaluation surplus. [Refer: Other comprehensive income; Revaluation surplus]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase in the fair value measurement of liabilities resulting from purchases of those liabilities. [Refer: At fair value [member]]

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The amount of transfers of liabilities into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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The amount of transfers of liabilities out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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The increase in the fair value measurement of liabilities resulting from exchange and other adjustments.

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The decrease in the fair value measurement of liabilities resulting from redemption.

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