Barclays (BCS) 6-K 28 Jul 21 Current report (foreign) Financial data

Cover

Cover	6 Months Ended
	Jun. 30, 2021
Cover [Abstract]
Document Type	6-K
Entity Registrant Name	Barclays PLC
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Document Period End Date	Jun. 30, 2021
Entity Central Index Key	0000312069
Current Fiscal Year End Date	--12-31

Condensed consolidated income s

Condensed consolidated income statement (unaudited) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Profit or loss [abstract]
Interest and similar income	£ 5,279	£ 6,437
Interest and similar expense	(1,376)	(2,214)
Net interest income	3,903	4,223
Fee and commission income	4,682	4,399
Fee and commission expense	(976)	(1,090)
Net fee and commission income	3,706	3,309
Net trading income	3,482	4,198
Net investment income	152	(136)
Other income	72	27
Total income	11,315	11,621
Credit impairment releases/(charges)	742	(3,738)
Net operating income	12,057	7,883
Staff costs	(4,334)	(4,053)
Infrastructure, administration and general expenses	(2,798)	(2,510)
Litigation and conduct	(99)	(30)
Total operating expenses	(7,231)	(6,593)
Share of post-tax results of associates and joint ventures	154	(31)
Profit on disposal of subsidiaries, associates and joint ventures	(1)	13
Profit before tax	4,979	1,272	[1]
Tax charge	(759)	(113)
Profit after tax	4,220	1,159
Attributable to:
Equity holders of the parent	3,812	695
Other equity instrument holders	389	427
Total equity holders of the parent	4,201	1,122
Non-controlling interests	19	37
Profit after tax	£ 4,220	£ 1,159
Earnings per share
Basic earnings per ordinary share (in GBP per share)	£ 0.222	£ 0.040
Diluted earnings per ordinary share (in GBP per share)	£ 0.217	£ 0.039
[1]	H120 comparative figures have been restated to make the condensed cash flow statement more relevant following a review of the disclosure and the accounting policies applied that was undertaken in H220. Amendments, which were first applied in the Barclays PLC Annual Report 2020, have been made to the classification of cash collateral reported within cash and cash equivalents and to the presentation of items within net cash flows from operating and investing activities. Footnotes 2 and 3 below quantify the impact of the changes to the respective cash flow categories in H120 and provide further detail.

Condensed consolidated statemen

Condensed consolidated statement of comprehensive income (unaudited) - GBP (£) £ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Statement of comprehensive income [abstract]
Profit after tax		£ 4,220	£ 1,159
Other comprehensive income/(loss) that may be recycled to profit or loss:
Currency translation reserve	[1]	(495)	1,220
Fair value through other comprehensive income reserve	[1]	(365)	137
Cash flow hedging reserve	[1]	(911)	912
Other	[1]	0	(6)
Other comprehensive income that may be recycled to profit	[1]	(1,771)	2,263
Other comprehensive (loss)/income not recycled to profit or loss:
Retirement benefit remeasurements	[1]	103	645
Fair value through other comprehensive income reserve	[1]	115	(515)
Own credit	[1]	(47)	496
Other comprehensive income not recycled to profit	[1]	171	626
Other comprehensive income for the period		(1,600)	2,889
Total comprehensive income for the period		2,620	4,048
Attributable to:
Equity holders of the parent		2,601	4,011
Non-controlling interests		19	37
Total comprehensive income for the period		£ 2,620	£ 4,048
[1]	Reported net of tax.

Condensed consolidated balance

Condensed consolidated balance sheet (unaudited) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and balances at central banks	£ 216,963	£ 191,127
Cash collateral and settlement balances	111,921	101,367
Loans and advances at amortised cost	348,549	342,632
Reverse repurchase agreements and other similar secured lending	4,459	9,031
Trading portfolio assets	147,239	127,950
Financial assets at fair value through the income statement	194,421	175,151
Derivative financial instruments	256,636	302,446
Financial assets at fair value through other comprehensive income	73,260	78,688
Investments in associates and joint ventures	907	781
Goodwill and intangible assets	8,196	7,948
Property, plant and equipment	3,581	4,036
Current tax assets	228	477
Deferred tax assets	3,771	3,444
Retirement benefit assets	2,701	1,814
Other assets	3,501	2,622
Total assets	1,376,333	1,349,514
Liabilities
Deposits at amortised cost	500,895	481,036
Cash collateral and settlement balances	101,923	85,423
Repurchase agreements and other similar secured borrowing	20,005	14,174
Debt securities in issue	90,733	75,796
Subordinated Liabilities	12,839	16,341
Trading portfolio liabilities	56,986	47,405
Financial liabilities designated at fair value	264,164	249,765
Derivative financial instruments	247,034	300,775
Current tax liabilities	592	645
Deferred tax liabilities	8	15
Retirement benefit liabilities	338	291
Other liabilities	10,928	8,662
Provisions	1,772	2,304
Total liabilities	1,308,217	1,282,632
Equity
Called up share capital and share premium	4,568	4,637
Other reserves	2,856	4,461
Retained earnings	48,461	45,527
Shareholders' equity attributable to ordinary shareholders of the parent	55,885	54,625
Other equity instruments	11,167	11,172
Total equity excluding non-controlling interests	67,052	65,797
Non-controlling interests	1,064	1,085
Total equity	68,116	66,882
Total equity and liabilities	£ 1,376,333	£ 1,349,514

Condensed consolidated statem_2

Condensed consolidated statement of changes in equity (unaudited) - GBP (£) £ in Millions		Total		Total	Total share capital and share premium	[1]	Other equity instruments		Other reserves	[1]	Retained earnings	Non-controlling interests	[2]
Beginning Balance, equity at Dec. 31, 2019		£ 65,660		£ 64,429	£ 4,594		£ 10,871	[1]	£ 4,760		£ 44,204	£ 1,231
Profit after tax		1,159		1,122			427	[1]			695	37
Currency translation movements		1,220	[3]	1,220					1,220
Fair value through other comprehensive income reserve		(378)		(378)					(378)
Cash flow hedges		912	[3]	912					912
Retirement benefit remeasurements		645	[3]	645							645
Own credit		496	[3]	496					496
Other		(6)	[3]	(6)							(6)
Total comprehensive income for the period		4,048		4,011			427	[1]	2,250		1,334	37
Equity settled share schemes		629		629	26						603
Other equity instruments coupon paid		(427)		(427)			(427)	[1]
Vesting of employee share schemes		(341)		(341)					(14)		(327)
Dividends paid		(37)										(37)
Other movements		9		3							3	6
Ending Balance, equity at Jun. 30, 2020		69,541		68,304	4,620		10,871	[1]	6,996		45,817	1,237
Beginning Balance, equity at Dec. 31, 2019		65,660		64,429	4,594		10,871	[1]	4,760		44,204	1,231
Other movements							(10)
Ending Balance, equity at Dec. 31, 2020		66,882		65,797	4,637		11,172	[1]	4,461		45,527	1,085
Beginning Balance, equity at Jun. 30, 2020		69,541		68,304	4,620		10,871	[1]	6,996		45,817	1,237
Profit after tax		1,302		1,261			430	[1]			831	41
Currency translation movements		(1,693)		(1,693)					(1,693)
Fair value through other comprehensive income reserve		570		570					570
Cash flow hedges		(339)		(339)					(339)
Retirement benefit remeasurements		(756)		(756)							(756)
Own credit		(1,077)		(1,077)					(1,077)
Other		11		11							11
Total comprehensive income for the period		(1,982)		(2,023)			430	[1]	(2,539)		86	41
Equity settled share schemes		(283)		(283)	17						(300)
Issue and exchange of other equity instruments		98		256			311	[1]			(55)	(158)
Other equity instruments coupon paid		(430)		(430)			(430)	[1]
Vesting of employee share schemes		(16)		(16)					4		(20)
Dividends paid		(42)										(42)
Other movements		(4)		(11)			(10)	[1]			(1)	7
Ending Balance, equity at Dec. 31, 2020		66,882		65,797	4,637		11,172	[1]	4,461		45,527	1,085
Profit after tax		4,220		4,201			389	[1]			3,812	19
Currency translation movements		(495)	[3]	(495)					(495)
Fair value through other comprehensive income reserve		(250)		(250)					(250)
Cash flow hedges		(911)	[3]	(911)					(911)
Retirement benefit remeasurements		103	[3]	103							103
Own credit		(47)	[3]	(47)					(47)
Other	[3]	0
Total comprehensive income for the period		2,620		2,601			389	[1]	(1,703)		3,915	19
Equity settled share schemes		314		314	25						289
Other equity instruments coupon paid		(389)		(389)			(389)	[1]
Vesting of employee share schemes		(393)		(393)					4		(397)
Dividends paid		(189)		(173)							(173)	(16)
Repurchase of shares		(700)		(700)	(94)				94		(700)
Other movements		(29)		(5)			(5)	[1]				(24)
Ending Balance, equity at Jun. 30, 2021		£ 68,116		£ 67,052	£ 4,568		£ 11,167	[1]	£ 2,856		£ 48,461	£ 1,064
[1]	Details of share capital, other equity instruments and other reserves are shown on pages 84 to 85.
[2]	2 Details of non-controlling interests are shown on page 73.
[3]	Reported net of tax.

Condensed consolidated cash flo

Condensed consolidated cash flow statement (unaudited) - GBP (£) £ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	[1]
Reconciliation of profit before tax to net cash flows from operating activities:
Profit before tax		£ 4,979	£ 1,272
Adjustment for non-cash items	[2]	6,900	(1,431)
Net increase in loans and advances at amortised cost	[2]	432	(12,868)
Net increase in deposits at amortised cost		19,859	51,126
Net increase in debt securities in issue		13,041	24,183
Changes in other operating assets and liabilities	[3]	(5,559)	(6,770)
Corporate income tax paid		(712)	(351)
Net cash from operating activities		38,940	55,161
Net cash from investing activities	[2]	(3,389)	(17,844)
Net cash from financing activities		(2,562)	3,133
Effect of exchange rates on cash and cash equivalents		(5,535)	7,814
Net increase/(decrease) in cash and cash equivalents		27,454	48,264
Cash and cash equivalents at beginning of the period	[3]	210,142	166,613
Cash and cash equivalents at end of period	[3]	£ 237,596	£ 214,877
[1]	H120 comparative figures have been restated to make the condensed cash flow statement more relevant following a review of the disclosure and the accounting policies applied that was undertaken in H220. Amendments, which were first applied in the Barclays PLC Annual Report 2020, have been made to the classification of cash collateral reported within cash and cash equivalents and to the presentation of items within net cash flows from operating and investing activities. Footnotes 2 and 3 below quantify the impact of the changes to the respective cash flow categories in H120 and provide further detail.
[2]	Movements in cash and cash equivalents relating to debt securities at amortised cost were previously shown within loans and advances at amortised cost in operating activities. These debt securities holdings are now considered to be part of the investing activity performed by the Group following a change in accounting policy and have been presented within investing activities in H121. Comparatives have been restated. The effect of this change was to reclassify £6,245m of net cash outflows from operating activities to investing activities in H120.
[3]	Cash and cash equivalents have been restated to exclude cash collateral and settlement balances, with the exception of balances that the Group holds at central banks related to payment schemes. The effect of this change decreased cash and cash equivalents by £28,301m as at 30 June 2020 and £16,774m as at 31 December 2019. As a result, net cash from operating activities decreased by £11,527m in H120, representing the net increase in the cash collateral and settlement balances line item in this period.

Condensed consolidated cash f_2

Condensed consolidated cash flow statement (unaudited) (Parenthetical) - GBP (£) £ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2020	Dec. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]
Increase (decrease) in cash and cash equivalents	[1]	£ (48,264)
Cash flows from (used in) operating activities	[1]	(55,161)
Net cash from investing activities	[1],[2]	(17,844)
Increase (decrease) due to corrections of prior period errors
Condensed Cash Flow Statements, Captions [Line Items]
Increase (decrease) in cash and cash equivalents		28,301	£ 16,774
Cash flows from (used in) operating activities		(11,527)
Increase (decrease) due to changes in accounting policy
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from (used in) operating activities		6,245
Net cash from investing activities		£ 6,245
[1]	H120 comparative figures have been restated to make the condensed cash flow statement more relevant following a review of the disclosure and the accounting policies applied that was undertaken in H220. Amendments, which were first applied in the Barclays PLC Annual Report 2020, have been made to the classification of cash collateral reported within cash and cash equivalents and to the presentation of items within net cash flows from operating and investing activities. Footnotes 2 and 3 below quantify the impact of the changes to the respective cash flow categories in H120 and provide further detail.
[2]	Movements in cash and cash equivalents relating to debt securities at amortised cost were previously shown within loans and advances at amortised cost in operating activities. These debt securities holdings are now considered to be part of the investing activity performed by the Group following a change in accounting policy and have been presented within investing activities in H121. Comparatives have been restated. The effect of this change was to reclassify £6,245m of net cash outflows from operating activities to investing activities in H120.

Basis of preparation

Basis of preparation	6 Months Ended
	Jun. 30, 2021
Disclosure of initial application of standards or interpretations [abstract]
Basis of preparation	Basis of preparation These condensed consolidated interim financial statements for the six months ended 30 June 2021 have been prepared in accordance with the Disclosure and Transparency Rules (DTR) of the UK’s Financial Conduct Authority (FCA) and IAS 34, Interim Financial Reporting, as published by the International Accounting Standards Board (IASB) and adopted by the UK. The condensed consolidated interim financial statements should be read in conjunction with the annual financial statements for the year ended 31 December 2020. The annual financial statements for the year ended 31 December 2020 were prepared in accordance with international accounting standards in conformity with the requirements of the Companies Act 2006 and in accordance with International Financial Reporting Standards (IFRS) and interpretations (IFRICs) as issued by the IASB and adopted pursuant to Regulation (EC) No 1606/2002 as it applies in the European Union as well as adopted by the UK. UK adopted IFRS and EU adopted IFRS are currently the same and were the same as at 31 December 2020. The accounting policies and methods of computation used in these condensed consolidated interim financial statements are the same as those used in the Barclays PLC Annual Report 2020. 1. Going concern The financial statements are prepared on a going concern basis, as the Directors are satisfied that the Group and parent company have the resources to continue in business for a period of at least 12 months from approval of the interim financial statements. In making this assessment, the Directors have considered a wide range of information relating to present and future conditions and includes a review of a working capital report (WCR). The WCR is used by the Directors to assess the future performance of the business and that it has the resources in place that are required to meet its ongoing regulatory requirements. The WCR also includes an assessment of the impact of internally generated stress testing scenarios on the liquidity and capital requirement forecasts. The stress tests used were based upon an assessment of reasonably possible downside economic scenarios that the Group could experience. The WCR indicated that the Group had sufficient capital in place to support its future business requirements and remained above its regulatory minimum requirements in the internal stress scenarios. 2. Other disclosures The Credit risk disclosures on pages 28 to 46 form part of these interim financial statements.

Segmental reporting

Segmental reporting	6 Months Ended
	Jun. 30, 2021
Disclosure of operating segments [abstract]
Segmental reporting	Segmental reporting Analysis of results by business Barclays Barclays Head Barclays Half year ended 30.06.21 £m £m £m £m Total income 3,199 8,218 (102) 11,315 Credit impairment releases 443 293 6 742 Net operating income/(expenses) 3,642 8,511 (96) 12,057 Operating expenses (2,114) (4,606) (412) (7,132) Litigation and conduct (22) (84) 7 (99) Total operating expenses (2,136) (4,690) (405) (7,231) Other net income 1 — 22 131 153 Profit/(loss) before tax 1,506 3,843 (370) 4,979 As at 30.06.21 £bn £bn £bn £bn Total assets 311.2 1,046.8 18.3 1,376.3 Barclays Barclays Head Barclays Half year ended 30.06.20 £m £m £m £m Total income 3,171 8,654 (204) 11,621 Credit impairment charges (1,064) (2,619) (55) (3,738) Net operating income/(expenses) 2,107 6,035 (259) 7,883 Operating expenses (2,041) (4,405) (117) (6,563) Litigation and conduct (11) (11) (8) (30) Total operating expenses (2,052) (4,416) (125) (6,593) Other net income/(expenses) 1 13 10 (41) (18) Profit/(loss) before tax 68 1,629 (425) 1,272 As at 31.12.20 £bn £bn £bn £bn Total assets 289.1 1,041.8 18.6 1,349.5 1 Other net income/(expenses) represents the share of post-tax results of associates and joint ventures, profit (or loss) on disposal of subsidiaries, associates and joint ventures and gains on acquisitions. Split of income by geographic region 1 Half year ended 30.06.21 Half year ended 30.06.20 £m £m United Kingdom 5,895 5,989 Europe 1,222 1,199 Americas 3,608 3,776 Africa and Middle East 20 20 Asia 570 637 Total 11,315 11,621 1 The geographical analysis is based on the location of the office where the transactions are recorded.

Net fee and commission income

Net fee and commission income	6 Months Ended
	Jun. 30, 2021
Fee and commission income (expense) [abstract]
Net fee and commission income	Net fee and commission income Fee and commission income is disaggregated below and includes a total for fees in scope of IFRS 15, Revenue from Contracts with Customers: Barclays UK Barclays International Head Office Total Half year ended 30.06.21 £m £m £m £m Fee type Transactional 408 1,181 — 1,589 Advisory 83 459 1 543 Brokerage and execution 109 553 — 662 Underwriting and syndication — 1,715 — 1,715 Other 35 73 3 111 Total revenue from contracts with customers 635 3,981 4 4,620 Other non-contract fee income — 62 — 62 Fee and commission income 635 4,043 4 4,682 Fee and commission expense (108) (861) (7) (976) Net fee and commission income 527 3,182 (3) 3,706 Barclays UK Barclays International Head Office Total Half year ended 30.06.20 £m £m £m £m Fee type Transactional 386 1,157 — 1,543 Advisory 79 306 1 386 Brokerage and execution 102 685 — 787 Underwriting and syndication — 1,468 — 1,468 Other 38 115 2 155 Total revenue from contracts with customers 605 3,731 3 4,339 Other non-contract fee income — 60 — 60 Fee and commission income 605 3,791 3 4,399 Fee and commission expense (148) (940) (2) (1,090) Net fee and commission income 457 2,851 1 3,309 Transactional fees are service charges on deposit accounts, cash management services and transactional processing fees. These include interchange and merchant fee income generated from credit and bank card usage. Advisory fees are generated from wealth management services and investment banking advisory services related to mergers, acquisitions and financial restructurings. Brokerage and execution fees are earned for executing client transactions with various exchanges and over-the-counter markets and assisting clients in clearing transactions. Underwriting and syndication fees are earned for the distribution of client equity or debt securities and the arrangement and administration of a loan syndication. These include commitment fees to provide loan financing.

Staff costs

Staff costs	6 Months Ended
	Jun. 30, 2021
Classes of employee benefits expense [abstract]
Staff costs	Staff costs Half year ended 30.06.21 Half year ended 30.06.20 Compensation costs £m £m Upfront bonus charge 824 476 Deferred bonus charge 262 269 Other incentives 6 4 Performance costs 1,092 749 Salaries 2,117 2,153 Social security costs 336 317 Post-retirement benefits 275 268 Other compensation costs 223 254 Total compensation costs 4,043 3,741 Other resourcing costs Outsourcing 171 175 Redundancy and restructuring 23 39 Temporary staff costs 55 58 Other 42 40 Total other resourcing costs 291 312 Total staff costs 4,334 4,053 Barclays Group compensation costs as a % of total income 35.7 32.2 No material awards have yet been granted in relation to the 2021 bonus pool as decisions regarding incentive awards are not taken by the Remuneration Committee until the performance for the full year can be assessed. The current year bonus charge for the first six months represents an accrual for estimated costs in accordance with accounting requirements. One of the primary considerations when evaluating the accrual is Group and business level returns, aligning colleague and shareholder interests. The Group has entered into physically settled forward contracts to hedge the settlement of certain share-based payment schemes. The present value of the fixed forward price to be paid under these outstanding contracts is £158m and has been recorded in retained earnings.

Infrastructure, administration

Infrastructure, administration and general expenses	6 Months Ended
	Jun. 30, 2021
Expenses by nature [abstract]
Infrastructure, administration and general expenses	Infrastructure, administration and general expenses Half year ended 30.06.21 Half year ended 30.06.20 Infrastructure costs £m £m Property and equipment 709 757 Depreciation and amortisation 832 751 Lease payments 20 26 Impairment of property, equipment and intangible assets 304 32 Total infrastructure costs 1,865 1,566 Administration and general expenses Consultancy, legal and professional fees 262 270 Marketing and advertising 163 158 Other administration and general expenses 508 516 Total administration and general expenses 933 944 Total infrastructure, administration and general expenses 2,798 2,510

Tax

Tax	6 Months Ended
	Jun. 30, 2021
Major components of tax expense (income) [abstract]
Tax	Tax The tax charge for H121 was £759m (H120: £113m), representing an effective tax rate of 15.2% (H120: 8.9%). The effective tax rate for H121 includes a benefit recognised as a result of the increase in the UK corporation tax rate and absent this benefit the tax charge would have been £1,151m and the effective tax rate would have been 23.1%. The H120 effective tax rate included a benefit recognised for re-measurement of the Group’s UK deferred tax assets as a result of UK corporation tax previously being maintained at a rate of 19%. Included in the H121 tax charge is a credit of £104m (H120: £112m) in respect of payments made on AT1 instruments that are classified as equity for accounting purposes. In its Budget held in March 2021, the UK Government announced that the UK rate of corporation tax will increase from 19% to 25% from 1 April 2023. This legislative change has been enacted, resulting in the Group’s UK deferred tax assets increasing by £223m with a tax benefit in the income statement of £392m and a tax charge within other comprehensive income of £169m. The UK Government also announced that it will undertake a review of the additional 8% banking surcharge during 2021. The Budget Report issued on 3 March 2021 outlines that “the government will set out how it intends to ensure that the combined rate of tax on banks’ profits does not increase substantially from its current level”. Any subsequent reduction in the banking surcharge arising from the Government’s review would result in a tax charge in the income statement and tax credit within the other comprehensive income upon enactment as the Group’s UK deferred tax assets are again re-measured and decreased, the timing of which is uncertain but is expected to occur in H122. In the USA, the Biden administration published in April 2021 The Made In America Tax Plan, which proposes an increase in the US federal corporate income tax rate. This would result in a re-measurement to increase the Group’s US deferred tax assets upon enactment, the timing of which is uncertain. In addition, revisions to international elements of the US tax regime are being considered that could affect the Group’s US tax position in future. The G7 finance ministers published a communiqué on 5 June 2021 which sets out high level political agreement on global tax reform, including the implementation of a global minimum tax rate. The Group will continue to monitor developments and assess the potential impact of associated future legislative changes. As at 30.06.21 As at 31.12.20 Deferred tax assets and liabilities £m £m USA 1,908 2,049 UK 1,380 886 Other territories 483 509 Deferred tax assets 3,771 3,444 Deferred tax liabilities (8) (15) Analysis of deferred tax assets Temporary differences 2,972 2,709 Tax losses 799 735 Deferred tax assets 3,771 3,444

Non-controlling interests

Non-controlling interests	6 Months Ended
	Jun. 30, 2021
Non-controlling interests [Abstract]
Non-controlling interests	Non-controlling interests Profit attributable to Equity attributable to Half year ended 30.06.21 Half year ended 30.06.20 As at 30.06.21 As at 31.12.20 £m £m £m £m Barclays Bank PLC issued: - Preference shares 13 28 529 529 - Upper T2 instruments 3 9 533 533 Other non-controlling interests 3 — 2 23 Total 19 37 1,064 1,085

Earnings per share

Earnings per share	6 Months Ended
	Jun. 30, 2021
Earnings per share [abstract]
Earnings per share	Earnings per share Half year ended 30.06.21 Half year ended 30.06.20 £m £m Profit attributable to ordinary equity holders of the parent 3,812 695 m m Basic weighted average number of shares in issue 17,140 17,294 Number of potential ordinary shares 467 319 Diluted weighted average number of shares 17,607 17,613 p p Basic earnings per ordinary share 22.2 4.0 Diluted earnings per ordinary share 21.7 3.9

Dividends on ordinary shares

Dividends on ordinary shares	6 Months Ended
	Jun. 30, 2021
Dividends on ordinary shares [Abstract]
Dividends on ordinary shares	Dividends on ordinary shares A half year dividend for 2021 of 2.0p (H120: 0p) per ordinary share will be paid on 17 September 2021 to shareholders on the register on 13 August 2021. Half year ended 30.06.21 Half year ended 30.06.20 Per share Total Per share Total Dividends paid during the period p £m p £m Full year dividend paid during period 1.0 173 — — For qualifying US and Canadian resident ADR holders, the half year dividend of 2.0p per ordinary share becomes 8.0p per ADS (representing 4 shares). The ADR depositary will post the half year dividend on 17 September 2021 to ADR holders on the record at close of business on 13 August 2021. The Directors have confirmed their intention to initiate a share buyback of up to £500m after the balance sheet date. The share buyback is expected to commence in the third quarter of 2021. The financial statements for the six months ended 30 June 2021 do not reflect the impact of the proposed share buyback, which will be accounted for as and when shares are repurchased by the Company.

Derivative financial instrument

Derivative financial instruments	6 Months Ended
	Jun. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [abstract]
Derivative financial instruments	Derivative financial instruments Contract notional amount Fair value Assets Liabilities As at 30.06.21 £m £m £m Foreign exchange derivatives 5,654,026 66,963 (64,194) Interest rate derivatives 37,888,009 134,734 (123,436) Credit derivatives 920,030 5,469 (5,960) Equity and stock index and commodity derivatives 1,541,007 48,530 (52,444) Derivative assets/(liabilities) held for trading 46,003,072 255,696 (246,034) Derivatives in hedge accounting relationships Derivatives designated as cash flow hedges 91,278 806 — Derivatives designated as fair value hedges 107,879 128 (993) Derivatives designated as hedges of net investments 1,595 6 (7) Derivative assets/(liabilities) designated in hedge accounting relationships 200,752 940 (1,000) Total recognised derivative assets/(liabilities) 46,203,824 256,636 (247,034) As at 31.12.20 Foreign exchange derivatives 5,554,037 84,739 (84,381) Interest rate derivatives 35,257,371 172,144 (162,402) Credit derivatives 847,845 4,605 (5,004) Equity and stock index and commodity derivatives 1,510,718 40,392 (48,008) Derivative assets/(liabilities) held for trading 43,169,971 301,880 (299,795) Derivatives in hedge accounting relationships Derivatives designated as cash flow hedges 74,437 386 — Derivatives designated as fair value hedges 114,556 155 (980) Derivatives designated as hedges of net investments 791 25 — Derivative assets/(liabilities) designated in hedge accounting relationships 189,784 566 (980) Total recognised derivative assets/(liabilities) 43,359,755 302,446 (300,775) The IFRS netting posted against derivative assets was £33bn including £4bn of cash collateral netted (December 2020: £44bn including £5bn cash collateral netted) and £31bn for liabilities including £5bn of cash collateral netted (December 2020: £42bn including £7bn of cash collateral netted). Derivative asset exposures would be £230bn (December 2020: £276bn) lower than reported under IFRS if netting were permitted for assets and liabilities with the same counterparty or for which the Group holds cash collateral of £36bn (December 2020: £43bn). Similarly, derivative liabilities would be £225bn (December 2020: £276bn) lower reflecting counterparty netting and cash collateral placed of £31bn (December 2020: £43bn). In addition, non-cash collateral of £5bn (December 2020: £5bn) was held in respect of derivative assets and £3bn (December 2020: £4bn) was placed in respect of derivative liabilities. Collateral amounts are limited to net on balance sheet exposure so as to not include over-collateralisation.

Fair value of financial instrum

Fair value of financial instruments	6 Months Ended
	Jun. 30, 2021
Disclosure of fair value measurement of assets [abstract]
Fair value of financial instruments	Fair value of financial instruments This section should be read in conjunction with Note 17, Fair value of financial instruments of the Barclays PLC Annual Report 2020 which provides more detail about accounting policies adopted, valuation methodologies used in calculating fair value and the valuation control framework which governs oversight of valuations. There have been no changes in the accounting policies adopted or the valuation methodologies used. Valuation The following table shows the Group’s assets and liabilities that are held at fair value disaggregated by valuation technique (fair value hierarchy) and balance sheet classification: Valuation technique using Quoted market prices Observable inputs Significant unobservable inputs (Level 1) (Level 2) (Level 3) Total As at 30.06.21 £m £m £m £m Trading portfolio assets 73,405 71,282 2,552 147,239 Financial assets at fair value through the income statement 1,229 185,415 7,777 194,421 Derivative financial instruments 11,643 241,336 3,657 256,636 Financial assets at fair value through other comprehensive income 21,375 51,837 48 73,260 Investment property — — 8 8 Total assets 107,652 549,870 14,042 671,564 Trading portfolio liabilities (30,911) (26,058) (17) (56,986) Financial liabilities designated at fair value (142) (263,710) (312) (264,164) Derivative financial instruments (11,227) (230,207) (5,600) (247,034) Total liabilities (42,280) (519,975) (5,929) (568,184) As at 31.12.20 Trading portfolio assets 60,671 65,416 1,863 127,950 Financial assets at fair value through the income statement 4,503 162,142 8,506 175,151 Derivative financial instruments 9,155 288,822 4,469 302,446 Financial assets at fair value through other comprehensive income 19,792 58,743 153 78,688 Investment property — — 10 10 Total assets 94,121 575,123 15,001 684,245 Trading portfolio liabilities (24,391) (22,986) (28) (47,405) Financial liabilities designated at fair value (159) (249,251) (355) (249,765) Derivative financial instruments (8,762) (285,774) (6,239) (300,775) Total liabilities (33,312) (558,011) (6,622) (597,945) The following table shows the Group’s Level 3 assets and liabilities that are held at fair value disaggregated by product type: As at 30.06.21 As at 31.12.20 Assets Liabilities Assets Liabilities £m £m £m £m Interest rate derivatives 916 (1,269) 1,613 (1,615) Foreign exchange derivatives 151 (129) 144 (143) Credit derivatives 100 (364) 196 (351) Equity derivatives 2,490 (3,838) 2,498 (4,112) Commodity derivatives — — 18 (18) Corporate debt 981 (38) 698 (3) Reverse repurchase and repurchase agreements — (161) — (174) Non-asset backed loans 6,338 — 6,394 — Asset backed securities 562 — 767 (24) Equity cash products 402 — 542 — Private equity investments 979 (16) 873 (14) Other 1 1,123 (114) 1,258 (168) Total 14,042 (5,929) 15,001 (6,622) 1 Other includes commercial real estate loans, funds and fund-linked products, asset backed loans, issued debt, commercial paper, government sponsored debt and investment property. Assets and liabilities reclassified between Level 1 and Level 2 During the period, there were no material transfers between Level 1 and Level 2 (period ended 31 December 2020: no material transfers between Level 1 and Level 2). Level 3 movement analysis The following table summarises the movements in the balances of Level 3 assets and liabilities during the period. The table shows gains and losses and includes amounts for all financial assets and liabilities that are held at fair value transferred to and from Level 3 during the period. Transfers have been reflected as if they had taken place at the beginning of the period. Asset and liability moves between Level 2 and Level 3 are primarily due to i) an increase or decrease in observable market activity related to an input or ii) a change in the significance of the unobservable input, with assets and liabilities classified as Level 3 if an unobservable input is deemed significant. Level 3 movement analysis Total gains and losses in the period recognised in the income statement Total gains or losses recognised in OCI Transfers As at 01.01.21 Purchases Sales Issues Settle-ments Trading income Other income In Out As at 30.06.21 £m £m £m £m £m £m £m £m £m £m £m Corporate debt 151 305 (87) — — 25 — — 40 (11) 423 Non-asset backed loans 709 620 (131) — (84) 13 — — 124 (106) 1,145 Asset backed securities 686 112 (294) — — (10) — — 43 (48) 489 Equity cash products 214 13 (17) — — 32 — — 29 (9) 262 Other 103 21 — — (51) (1) — — 162 (1) 233 Trading portfolio assets 1,863 1,071 (529) — (135) 59 — — 398 (175) 2,552 Non-asset backed loans 5,580 698 (299) — (687) (119) — — 69 (48) 5,194 Equity cash products 326 160 (194) — — (171) 18 — 1 — 140 Private equity investments 874 106 (9) — (8) (5) 92 — — (71) 979 Other 1,726 2,291 (2,389) — (162) (19) 1 — 16 — 1,464 Financial assets at fair value through the income statement 8,506 3,255 (2,891) — (857) (314) 111 — 86 (119) 7,777 Non-asset backed loans 106 — — — — — — — — (106) — Asset backed securities 47 4 — — (5) — — 2 — — 48 Assets at fair value through other comprehensive income 153 4 — — (5) — — 2 — (106) 48 Investment property 10 — (2) — — — — — — — 8 — — Trading portfolio liabilities (28) (3) 14 — — (7) — — — 7 (17) Financial liabilities designated at fair value (355) — — — 98 7 (2) — (78) 18 (312) Interest rate derivatives (2) 9 — — 33 (121) 4 — 21 (297) (353) Foreign exchange derivatives 1 — — — 58 (6) — — 3 (34) 22 Credit derivatives (155) (117) 2 — (5) 12 (1) — 1 (1) (264) Equity derivatives (1,614) (315) (1) — (32) (221) (1) — 28 808 (1,348) Net derivative financial instruments 1 (1,770) (423) 1 — 54 (336) 2 — 53 476 (1,943) Total 8,379 3,904 (3,407) — (845) (591) 111 2 459 101 8,113 1 Derivative financial instruments are represented on a net basis. On a gross basis, derivative financial assets were £3,657m and derivative financial liabilities were £5,600m. Level 3 movement analysis As at 01.01.20 Purchases Sales Issues Settle- Total gains and losses in the period recognised in the income statement Total gains or losses recognised in OCI Transfers As at 30.06.20 Trading income Other income In Out £m £m £m £m £m £m £m £m £m £m £m Corporate debt 120 25 — — — (26) — — 4 (17) 106 Non-asset backed loans 974 1,926 (740) — (4) (111) — — 97 (320) 1,822 Asset backed securities 656 249 (224) — (76) (12) — — 41 (11) 623 Equity cash products 392 2 (4) — — (67) — — 28 (4) 347 Other 122 48 — — — 2 — — 8 — 180 Trading portfolio assets 2,264 2,250 (968) — (80) (214) — — 178 (352) 3,078 Non-asset backed loans 5,494 1,050 (270) — (410) 381 — — — (58) 6,187 Equity cash products 835 14 — — — (22) (28) — — — 799 Private equity investments 900 19 (6) — (2) 2 (44) — 23 (12) 880 Other 1,271 1,870 (2,017) — (18) (8) 64 — 24 — 1,186 Financial assets at fair value through the income statement 8,500 2,953 (2,293) — (430) 353 (8) — 47 (70) 9,052 Non-asset backed loans 343 79 — — (157) — — (3) — — 262 Asset backed securities 86 — (1) — — 1 — (1) — — 85 Assets at fair value through other comprehensive income 429 79 (1) — (157) 1 — (4) — — 347 Investment property 13 — (1) — — — (2) — 2 (2) 10 Trading portfolio liabilities — — — — — — — — — — — Financial liabilities designated at fair value (362) — 1 (3) — (10) 2 — (22) 25 (369) Interest rate derivatives (206) 18 — — 10 268 1 — 300 (10) 381 Foreign exchange derivatives (7) — — — (12) 89 — — 5 (8) 67 Credit derivatives 198 (258) 11 — (376) 151 1 — 2 8 (263) Equity derivatives (819) (448) (1) — 17 (90) — — (5) (23) (1,369) Net derivative financial instruments 1 (834) (688) 10 — (361) 418 2 — 302 (33) (1,184) Total 10,010 4,594 (3,252) (3) (1,028) 548 (6) (4) 507 (432) 10,934 1 Derivative financial instruments are represented on a net basis. On a gross basis, derivative financial assets were £7,748m and derivative financial liabilities were £8,932m. Unrealised gains and losses on Level 3 financial assets and liabilities The following table discloses the unrealised gains and losses recognised in the period arising on Level 3 financial assets and liabilities held at the period end. Half year ended 30.06.21 Half year ended 30.06.20 Income statement Other compre hensive income Total Income statement Other compre hensive income Total Trading income Other income Trading income Other income £m £m £m £m £m £m £m £m Trading portfolio assets 35 — — 35 (177) — — (177) Financial assets at fair value through the income statement (201) 114 — (87) 397 (53) — 344 Financial assets at fair value through other comprehensive income — — — — — — (2) (2) Investment properties — — — — — (2) — (2) Trading portfolio liabilities (6) — — (6) — — — — Financial liabilities designated at fair value 7 — — 7 (16) (1) — (17) Net derivative financial instruments (367) — — (367) 248 — — 248 Non-current assets/liabilities held for sale — — — — — — — — Total (532) 114 — (418) 452 (56) (2) 394 Valuation techniques and sensitivity analysis Sensitivity analysis is performed on products with significant unobservable inputs (Level 3) to generate a range of reasonably possible alternative valuations. The sensitivity methodologies applied take account of the nature of valuation techniques used, as well as the availability and reliability of observable proxy and historical data and the impact of using alternative models. Current year valuation and sensitivity methodologies are consistent with those described within Note 17, Fair value of financial instruments in the Barclays PLC Annual Report 2020. Sensitivity analysis of valuations using unobservable inputs As at 30.06.21 As at 31.12.20 Favourable changes Unfavourable changes Favourable changes Unfavourable changes Income statement Equity Income statement Equity Income statement Equity Income statement Equity £m £m £m £m £m £m £m £m Interest rate derivatives 52 — (83) — 82 — (123) — Foreign exchange derivatives 6 — (10) — 6 — (11) — Credit derivatives 53 — (44) — 55 — (44) — Equity derivatives 185 — (193) — 174 — (179) — Commodity derivatives 2 — (2) — 2 — (2) — Corporate debt 22 — (16) — 16 — (14) — Non-asset backed loans 202 — (310) — 190 3 (409) (3) Equity cash products 130 — (119) — 158 — (141) — Private equity investments 223 — (198) — 199 — (227) — Other 1 18 — (18) — 21 — (21) — Total 893 — (993) — 903 3 (1,171) (3) 1 Other includes commercial real estate loans, funds and fund-linked products, asset backed loans, issued debt, commercial paper, government sponsored debt and investment property. The effect of stressing unobservable inputs to a range of reasonably possible alternatives, alongside considering the impact of using alternative models, would be to increase fair values by up to £893m (December 2020: £906m) or to decrease fair values by up to £993m (December 2020: £1,174m) with substantially all the potential effect impacting profit and loss rather than reserves. Significant unobservable inputs The valuation techniques and significant unobservable inputs for assets and liabilities recognised at fair value and classified as Level 3 are consistent with Note 17, Fair value of financial instruments in the Barclays PLC Annual Report 2020. Fair value adjustments Key balance sheet valuation adjustments are quantified below: As at 30.06.21 As at 31.12.20 £m £m Exit price adjustments derived from market bid-offer spreads (500) (493) Uncollateralised derivative funding (80) (115) Derivative credit valuation adjustments (210) (268) Derivative debit valuation adjustments 91 113 • Exit price adjustments derived from market bid-offer spreads increased by £7m to £500m • Uncollateralised derivative funding decreased by £35m to £80m as a result of tightening input funding spreads • Derivative credit valuation adjustments decreased by £58m to £210m as a result of tightening input counterparty credit spreads • Derivative debit valuation adjustments decreased by £22m to £91m as a result of tightening input Barclays Bank PLC credit spreads Portfolio exemption The Group uses the portfolio exemption in IFRS 13, Fair Value Measurement to measure the fair value of groups of financial assets and liabilities. Instruments are measured using the price that would be received to sell a net long position (i.e. an asset) for a particular risk exposure or to transfer a net short position (i.e. a liability) for a particular risk exposure in an orderly transaction between market participants at the balance sheet date under current market conditions. Accordingly, the Group measures the fair value of the group of financial assets and liabilities consistently with how market participants would price the net risk exposure at the measurement date. Unrecognised gains as a result of the use of valuation models using unobservable inputs The amount that has yet to be recognised in income that relates to the difference between the transaction price (the fair value at initial recognition) and the amount that would have arisen had valuation models using unobservable inputs been used on initial recognition, less amounts subsequently recognised, is £126m (December 2020: £116m) for financial instruments measured at fair value and £240m (December 2020: £247m) for financial instruments carried at amortised cost. There are additions of £32m (December 2020: £27m) and amortisation and releases of £22m (December 2020: £24m) for financial instruments measured at fair value and additions of £nil (December 2020: £6m) and amortisation and releases of £7m (December 2020: £14m) for financial instruments carried at amortised cost. Third party credit enhancements Structured and brokered certificates of deposit issued by the Group are insured up to $250,000 per depositor by the Federal Deposit Insurance Corporation (FDIC) in the United States. The FDIC is funded by premiums that Barclays and other banks pay for deposit insurance coverage. The carrying value of these issued certificates of deposit that are designated under the IFRS 9 fair value option includes this third party credit enhancement. The on balance sheet value of these brokered certificates of deposit amounted to £1,241m (December 2020: £1,494m). Comparison of carrying amounts and fair values for assets and liabilities not held at fair value Valuation methodologies employed in calculating the fair value of financial assets and liabilities measured at amortised cost are consistent with those described within Note 17, Fair value of financial instruments in the Barclays PLC Annual Report 2020. The following table summarises the fair value of financial assets and liabilities measured at amortised cost on the Group’s balance sheet. As at 30.06.21 As at 31.12.20 Carrying amount Fair value Carrying amount Fair value Financial assets £m £m £m £m Loans and advances at amortised cost 348,549 347,733 342,632 340,516 Reverse repurchase agreements and other similar secured lending 4,459 4,459 9,031 9,031 Financial liabilities Deposits at amortised cost (500,895) (500,933) (481,036) (481,106) Repurchase agreements and other similar secured borrowing (20,005) (20,005) (14,174) (14,174) Debt securities in issue (90,733) (92,746) (75,796) (77,813) Subordinated liabilities (12,839) (13,434) (16,341) (16,918)

Loans and advances and deposits

Loans and advances and deposits at amortised cost	6 Months Ended
	Jun. 30, 2021
Loans and advances and deposits at amortised cost [Abstract]
Loans and advances and deposits at amortised cost	Loans and advances and deposits at amortised cost As at 30.06.21 As at 31.12.20 £m £m Loans and advances at amortised cost to banks 11,032 8,900 Loans and advances at amortised cost to customers 309,194 309,927 Debt securities at amortised cost 28,323 23,805 Total loans and advances at amortised cost 348,549 342,632 Deposits at amortised cost from banks 17,165 17,343 Deposits at amortised cost from customers 483,730 463,693 Total deposits at amortised cost 500,895 481,036

Goodwill and intangible assets

Goodwill and intangible assets	6 Months Ended
	Jun. 30, 2021
Intangible assets and goodwill [abstract]
Goodwill and intangible assets	Goodwill and intangible assets Goodwill and intangible assets are allocated to business operations according to business segments as follows: As at 30.06.21 As at 31.12.20 Goodwill Intangibles Total Goodwill Intangibles Total £m £m £m £m £m £m Barclays UK 3,560 1,570 5,130 3,560 1,618 5,178 Barclays International 286 2,735 3,021 289 2,435 2,724 Head Office 42 3 45 42 4 46 Total 3,888 4,308 8,196 3,891 4,057 7,948

Subordinated liabilities

Subordinated liabilities	6 Months Ended
	Jun. 30, 2021
Subordinated liabilities [abstract]
Subordinated liabilities	Subordinated liabilities Half year ended 30.06.21 Year ended 31.12.20 £m £m Opening balance as at 1 January 16,341 18,156 Issuances 1,734 1,438 Redemptions (4,534) (3,464) Other (702) 211 Closing balance 12,839 16,341 Issuances of £1,734m comprise £855m EUR 1.125% Fixed Rate Resetting Subordinated Callable Notes and £724m USD 3.811% Fixed Rate Resetting Subordinated Callable Notes, both issued externally by Barclays PLC and £82m ZAR Floating Rate Notes and £73m USD Floating Rate Notes issued externally by Barclays subsidiaries. Redemptions of £4,534m comprise £1,961m GBP 10% Fixed Rate Subordinated Notes, £1,339m EUR 6% Fixed Rate Subordinated Notes, £1,075m USD 10.179% Fixed Rate Subordinated Notes and £86m EUR Subordinated Floating Rate Notes, issued externally by Barclays Bank PLC and £73m USD Floating Rate Notes issued externally by a Barclays subsidiary. Other movements predominantly comprise foreign exchange movements and fair value hedge adjustments.

Provisions

Provisions	6 Months Ended
	Jun. 30, 2021
Provisions [abstract]
Provisions	Provisions As at 30.06.21 As at 31.12.20 £m £m Customer redress 449 497 Legal, competition and regulatory matters 223 268 Redundancy and restructuring 88 158 Undrawn contractually committed facilities and guarantees 713 1,064 Onerous contracts 14 28 Sundry provisions 285 289 Total 1,772 2,304

Retirement benefits

Retirement benefits	6 Months Ended
	Jun. 30, 2021
Disclosure of defined benefit plans [abstract]
Disclosure of retirement benefits	Retirement benefits As at 30 June 2021, the Group’s IAS 19 pension surplus across all schemes was £2.4bn (December 2020: £1.5bn). The UK Retirement Fund (UKRF), which is the Group’s main scheme, had an IAS 19 pension surplus of £2.6bn (December 2020: £1.8bn). The movement for the UKRF was driven by payment of deficit reduction contributions, and an increase in the discount rate, partially offset by higher than expected long-term price inflation. UKRF funding valuations

Called up share capital

Called up share capital	6 Months Ended
	Jun. 30, 2021
Equity [abstract]
Called up share capital	Called up share capital Ordinary share capital Share premium Total share capital and share premium Half year ended 30.06.21 £m £m £m Opening balance as at 1 January 4,340 297 4,637 Issue of shares under employee share schemes 3 22 25 Repurchase of shares (94) — (94) Closing balance 4,249 319 4,568

Other equity instruments

Other equity instruments	6 Months Ended
	Jun. 30, 2021
Miscellaneous components of equity [abstract]
Other equity instruments	Other equity instruments Half year ended 30.06.21 Year ended 31.12.20 £m £m Opening balance as at 1 January 11,172 10,871 Issuances — 1,142 Redemptions — (831) Securities held by the Group (5) (10) Closing balance 11,167 11,172 Other equity instruments of £11,167m (December 2020: £11,172m) include AT1 securities issued by Barclays PLC. There have been no issuances or redemptions in the period. The AT1 securities are perpetual securities with no fixed maturity and are structured to qualify as AT1 instruments under prevailing capital rules applicable as at the relevant issue date. AT1 securities are undated and are redeemable, at the option of Barclays PLC, in whole on (i) the initial call date, or on any fifth anniversary after the initial call date or (ii) any day falling in a named period ending on the initial reset date, or on any fifth anniversary after the initial reset date. In addition, the AT1 securities are redeemable, at the option of Barclays PLC, in whole in the event of certain changes in the tax or regulatory treatment of the securities. Any redemptions require the prior consent of the PRA. All Barclays PLC AT1 securities will be converted into ordinary shares of Barclays PLC, at a pre-determined price, should the fully loaded CET1 ratio of the Group fall below 7%.

Other reserves

Other reserves	6 Months Ended
	Jun. 30, 2021
Disclosure of reserves within equity [abstract]
Other reserves	Other reserves As at 30.06.21 As at 31.12.20 £m £m Currency translation reserve 2,376 2,871 Fair value through other comprehensive income reserve (245) 5 Cash flow hedging reserve 664 1,575 Own credit reserve (1,001) (954) Other reserves and treasury shares 1,062 964 Total 2,856 4,461 Currency translation reserve The currency translation reserve represents the cumulative gains and losses on the retranslation of the Group’s net investment in foreign operations, net of the effects of hedging. As at 30 June 2021, there was a credit balance of £2,376m (December 2020: £2,871m credit) in the currency translation reserve. The £495m debit movement principally reflects the strengthening of GBP against USD and EUR during the period. Fair value through other comprehensive income reserve The fair value through other comprehensive income reserve represents the unrealised change in the fair value through other comprehensive income investments since initial recognition. As at 30 June 2021, there was a debit balance of £245m (December 2020: £5m credit) in the fair value through other comprehensive income reserve. The loss of £250m is principally driven by a loss of £325m from the decrease in fair value of bonds due to increasing bond yields and £199m of net gains transferred to the income statement. This is partially offset by a gain of £114m due to an increase in the Absa Group Limited share price and a tax credit of £168m. £8m release in impairment was also noted during the period. Cash flow hedging reserve The cash flow hedging reserve represents the cumulative gains and losses on effective cash flow hedging instruments that will be recycled to the income statement when the hedged transactions affect profit or loss. As at 30 June 2021, there was a credit balance of £664m (December 2020: £1,575m credit) in the cash flow hedging reserve. The decrease of £911m principally reflects a £902m decrease in the fair value of interest rate swaps held for hedging purposes as major interest rate forward curves increased and £287m of gains transferred to the income statement. This is partially offset by a tax credit of £282m. Own credit reserve The own credit reserve reflects the cumulative own credit gains and losses on financial liabilities at fair value. Amounts in the own credit reserve are not recycled to profit or loss in future periods. As at 30 June 2021, there was a debit balance of £1,001m (December 2020: £954m debit) in the own credit reserve. The movement of £47m principally reflects a £266m loss from the tightening of Barclays’ funding spreads. This is partially offset by other activity of £100m and a tax credit of £115m. Other reserves and treasury shares Other reserves relate to redeemed ordinary and preference shares issued by the Group. Treasury shares relate to Barclays PLC shares held principally in relation to the Group’s various share schemes. As at 30 June 2021, there was a credit balance of £1,062m (December 2020: £964m credit) in other reserves and treasury shares. This is driven by an increase of £94m due to the repurchase of 377m shares as part of the £0.7bn share buyback and a £4m increase due to a reduction in treasury shares held in relation to employee share schemes.

Contingent liabilities and comm

Contingent liabilities and commitments	6 Months Ended
	Jun. 30, 2021
Disclosure of contingent liabilities [abstract]
Contingent liabilities and commitments	Contingent liabilities and commitments As at 30.06.21 As at 31.12.20 Contingent liabilities £m £m Guarantees and letters of credit pledged as collateral security 13,519 15,665 Performance guarantees, acceptances and endorsements 5,679 5,944 Total 19,198 21,609 Commitments Documentary credits and other short-term trade related transactions 1,017 1,086 Standby facilities, credit lines and other commitments 345,281 331,963 Total 346,298 333,049 In addition to the above, Note 21, Legal, competition and regulatory matters details out further contingent liabilities where it is not practicable to disclose an estimate of the potential financial effect on Barclays.

Legal, competition and regulato

Legal, competition and regulatory matters	6 Months Ended
	Jun. 30, 2021
Legal, competition and regulatory matters [Abstract]
Legal, competition and regulatory matters	Legal, competition and regulatory mattersThe Group faces legal, competition and regulatory challenges, many of which are beyond our control. The extent of the impact of these matters cannot always be predicted but may materially impact our operations, financial results, condition and prospects. Matters arising from a set of similar circumstances can give rise to either a contingent liability or a provision, or both, depending on the relevant facts and circumstances. The recognition of provisions in relation to such matters involves critical accounting estimates and judgments in accordance with the relevant accounting policies applicable to Note 15, Provisions. We have not disclosed an estimate of the potential financial impact or effect on the Group of contingent liabilities where it is not currently practicable to do so. Various matters detailed in this note seek damages of an unspecified amount. While certain matters specify the damages claimed, such claimed amounts do not necessarily reflect the Group’s potential financial exposure in respect of those matters. Matters are ordered under headings corresponding to the financial statements in which they are disclosed. 1. Barclays PLC and Barclays Bank PLC Investigations into certain advisory services agreements and related civil action FCA proceedings In 2008, Barclays Bank PLC and Qatar Holdings LLC entered into two advisory service agreements (the Agreements). The Financial Conduct Authority (FCA) conducted an investigation into whether the Agreements may have related to Barclays PLC’s capital raisings in June and November 2008 (the Capital Raisings) and therefore should have been disclosed in the announcements or public documents relating to the Capital Raisings. In 2013, the FCA issued warning notices (the Notices) finding that Barclays PLC and Barclays Bank PLC acted recklessly and in breach of certain disclosure-related listing rules, and that Barclays PLC was also in breach of Listing Principle 3. The financial penalty provided in the Notices is £50m. Barclays PLC and Barclays Bank PLC continue to contest the findings. Following the conclusion of the Serious Fraud Office (SFO) proceedings against certain former Barclays executives resulting in their acquittals, the FCA proceedings, which were stayed, have resumed. Civil action In 2021, the High Court of Justice (High Court) dismissed a claim brought by PCP Capital Partners LLP and PCP International Finance Limited (PCP) against Barclays Bank PLC for fraudulent misrepresentation and deceit, arising from certain statements made by Barclays Bank PLC to PCP relating to the November 2008 capital raising. PCP’s application to appeal the High Court’s decision has also been refused which concludes these proceedings. Investigations into LIBOR and other benchmarks and related civil actions Regulators and law enforcement agencies, including certain competition authorities, from a number of governments have conducted investigations relating to Barclays Bank PLC’s involvement in allegedly manipulating certain financial benchmarks, such as LIBOR. The SFO closed its investigation with no action to be taken against the Group. Various individuals and corporates in a range of jurisdictions have threatened or brought civil actions against the Group and other banks in relation to the alleged manipulation of LIBOR and/or other benchmarks. USD LIBOR civil actions The majority of the USD LIBOR cases, which have been filed in various US jurisdictions, have been consolidated for pre-trial purposes in the US District Court in the Southern District of New York (SDNY). The complaints are substantially similar and allege, among other things, that Barclays PLC, Barclays Bank PLC, Barclays Capital Inc. (BCI) and other financial institutions individually and collectively violated provisions of the US Sherman Antitrust Act (Antitrust Act), the US Commodity Exchange Act (CEA), the US Racketeer Influenced and Corrupt Organizations Act (RICO), the Securities Exchange Act of 1934 and various state laws by manipulating USD LIBOR rates. Putative class actions and individual actions seek unspecified damages with the exception of three lawsuits, in which the plaintiffs are seeking a combined total of approximately $100m in actual damages and additional punitive damages against all defendants, including Barclays Bank PLC. Some of the lawsuits also seek trebling of damages under the Antitrust Act and RICO. Barclays Bank PLC has previously settled certain claims. Two class action settlements where Barclays Bank PLC has respectively paid $7.1m and $20m, have received final court approval. Barclays Bank PLC also settled a further matter for $7.5m, paid in June 2021. Sterling LIBOR civil actions In 2016, two putative class actions filed in the SDNY against Barclays Bank PLC, BCI and other Sterling LIBOR panel banks alleging, among other things, that the defendants manipulated the Sterling LIBOR rate in violation of the Antitrust Act, CEA and RICO, were consolidated. The defendants’ motion to dismiss the claims was granted in 2018. The plaintiffs have appealed the dismissal. Japanese Yen LIBOR civil actions In 2012, a putative class action was filed in the SDNY against Barclays Bank PLC and other Japanese Yen LIBOR panel banks by a lead plaintiff involved in exchange-traded derivatives and members of the Japanese Bankers Association’s Euroyen Tokyo Interbank Offered Rate (Euroyen TIBOR) panel. The complaint alleges, among other things, manipulation of the Euroyen TIBOR and Yen LIBOR rates and breaches of the CEA and the Antitrust Act. In 2014, the court dismissed the plaintiff’s antitrust claims, and, in 2020, the court dismissed the plaintiff’s remaining CEA claims. The plaintiff has appealed the lower court’s dismissal of such claims. In 2015, a second putative class action, making similar allegations to the above class action, was filed in the SDNY against Barclays PLC, Barclays Bank PLC and BCI. The plaintiffs filed an amended complaint in 2020, and the defendants have filed a motion to dismiss. SIBOR/SOR civil action In 2016, a putative class action was filed in the SDNY against Barclays PLC, Barclays Bank PLC, BCI and other defendants, alleging manipulation of the Singapore Interbank Offered Rate (SIBOR) and Singapore Swap Offer Rate (SOR). In 2018, the court dismissed all claims against Barclays PLC, Barclays Bank PLC and BCI. The plaintiffs’ appeal of the dismissal of their claims was granted in March 2021 and the matter has been remanded to the lower court for further proceedings. ICE LIBOR civil actions In 2019, several putative class actions were filed in the SDNY against a panel of banks, including Barclays PLC, Barclays Bank PLC, BCI, other financial institution defendants and Intercontinental Exchange Inc. and certain of its affiliates (ICE), asserting antitrust claims that defendants manipulated USD LIBOR through defendants’ submissions to ICE. These actions have been consolidated. The defendants’ motion to dismiss was granted in 2020. The plaintiffs have appealed the dismissal. In August 2020, an ICE LIBOR-related action was filed by a group of individual plaintiffs in the US District Court for the Northern District of California on behalf of individual borrowers and consumers of loans and credit cards with variable interest rates linked to USD ICE LIBOR. Plaintiffs have filed motions seeking, among other things, preliminary and permanent injunctions to enjoin the defendants from continuing to set LIBOR or enforce any financial instrument that relies in whole or in part on USD LIBOR. Non-US benchmarks civil actions Legal proceedings (which include the claims referred to below in ‘Local authority civil actions concerning LIBOR’) have been brought or threatened against Barclays Bank PLC (and, in certain cases, Barclays Bank UK PLC) in the UK in connection with alleged manipulation of LIBOR, EURIBOR and other benchmarks. Proceedings have also been brought in a number of other jurisdictions in Europe and Israel. Additional proceedings in other jurisdictions may be brought in the future. Credit Default Swap civil action In July 2021, the New Mexico Attorney General, on behalf of the New Mexico State Investment Council, filed an antitrust class action in the US District Court for the District of New Mexico against Barclays PLC, Barclays Bank PLC, BCI and other financial institutions. The plaintiff alleges that the defendants conspired to manipulate the benchmark price used to value Credit Default Swap (CDS) contracts at settlement (i.e. the CDS final auction price). The plaintiff alleges violations of the Antitrust Act and the CEA, and unjust enrichment under state law. Foreign Exchange investigations and related civil actions In 2015, the Group reached settlements totalling approximately $2.38bn with various US federal and state authorities and the FCA in relation to investigations into certain sales and trading practices in the Foreign Exchange market. The Group continues to provide relevant information to certain authorities. The European Commission is one of a number of authorities still conducting an investigation into certain trading practices in Foreign Exchange markets. The European Commission announced two settlements in May 2019 and the Group paid penalties totalling approximately €210m. In June 2019, the Swiss Competition Commission announced two settlements and the Group paid penalties totalling approximately CHF 27m. The financial impact of the ongoing matters is not expected to be material to the Group’s operating results, cash flows or financial position. Various individuals and corporates in a range of jurisdictions have threatened or brought civil actions against the Group and other banks in relation to alleged manipulation of Foreign Exchange markets. FX opt out civil action In 2018, Barclays Bank PLC and BCI settled a consolidated action filed in the SDNY, alleging manipulation of Foreign Exchange markets (Consolidated FX Action), for a total amount of $384m. Also in 2018, a group of plaintiffs who opted out of the Consolidated FX Action filed a complaint in the SDNY against Barclays PLC, Barclays Bank PLC, BCI and other defendants. Some of the plaintiff’s claims were dismissed in 2020. Retail basis civil action In 2015, a putative class action was filed against several international banks, including Barclays PLC and BCI, on behalf of a proposed class of individuals who exchanged currencies on a retail basis at bank branches (Retail Basis Claims). The SDNY has ruled that the Retail Basis Claims are not covered by the settlement agreement in the Consolidated FX Action. The Court subsequently dismissed all Retail Basis Claims against the Group and all other defendants. The plaintiffs have filed an amended complaint. Non-US FX civil actions Legal proceedings have been brought or are threatened against Barclays PLC, Barclays Bank PLC, BCI and Barclays Execution Services Limited (BX) in connection with alleged manipulation of Foreign Exchange in the UK, a number of other jurisdictions in Europe, Israel and Australia and additional proceedings may be brought in the future. These include two purported class actions filed against Barclays PLC, Barclays Bank PLC, BX, BCI and other financial institutions in the UK Competition Appeal Tribunal in 2019 following the settlements with the European Commission described above. Also in 2019, a separate claim was filed in the UK in the High Court by various banks and asset management firms against Barclays Bank PLC and other financial institutions alleging breaches of European and UK competition laws related to FX trading. Metals investigations and related civil actions Barclays Bank PLC previously provided information to the US Department of Justice (DoJ), the US Commodity Futures Trading Commission and other authorities in connection with investigations into metals and metals-based financial instruments. A number of US civil complaints, each on behalf of a proposed class of plaintiffs, have been consolidated and transferred to the SDNY. The complaints allege that Barclays Bank PLC and other members of The London Gold Market Fixing Ltd. manipulated the prices of gold and gold derivative contracts in violation of the Antitrust Act and other federal laws. This consolidated putative class action remains pending. A separate US civil complaint by a proposed class of plaintiffs against a number of banks, including Barclays Bank PLC, BCI and BX, alleging manipulation of the price of silver in violation of the CEA, the Antitrust Act and state antitrust and consumer protection laws, has been dismissed as against the Barclays entities. The plaintiffs have the option to seek the court’s permission to appeal. Civil actions have also been filed in Canadian courts against Barclays PLC, Barclays Bank PLC, Barclays Capital Canada Inc. and BCI on behalf of proposed classes of plaintiffs alleging manipulation of gold and silver prices. US residential mortgage related civil actions There are various pending civil actions relating to US Residential Mortgage-Backed Securities (RMBS), including four actions arising from unresolved repurchase requests submitted by Trustees for certain RMBS, alleging breaches of various loan-level representations and warranties (R&Ws) made by Barclays Bank PLC and/or a subsidiary acquired in 2007. The unresolved repurchase requests had an original principal balance of approximately $2.1bn. The Trustees have also alleged that the relevant R&Ws may have been breached with respect to a greater (but unspecified) amount of loans than previously stated in the unresolved repurchase requests. These repurchase actions are ongoing. In one repurchase action, the New York Court of Appeals held that claims related to certain R&Ws are time-barred. Barclays Bank PLC has reached a settlement to resolve two of the repurchase actions, which is subject to final court approval. The financial impact of the settlement is not expected to be material to the Group’s operating results, cash flows or financial position. The remaining two repurchase actions are pending. In 2020, a civil litigation claim was filed in the New Mexico First Judicial District Court by the State of New Mexico against six banks, including BCI, on behalf of two New Mexico state pension funds and the New Mexico State Investment Council relating to legacy RMBS purchases. As to BCI, the complaint alleges that the funds purchased approximately $22m in RMBS underwritten by BCI. The plaintiffs have asserted claims under New Mexico state law, which provides for the ability to claim treble damages and civil penalties. Government and agency securities civil actions and related matters Certain governmental authorities have conducted investigations into activities relating to the trading of certain government and agency securities in various markets. The Group provided information in cooperation with such investigations. Civil actions have also been filed on the basis of similar allegations, as described below. Treasury auction securities civil actions Consolidated putative class action complaints filed in US federal court against Barclays Bank PLC, BCI and other financial institutions under the Antitrust Act and state common law allege that the defendants (i) conspired to manipulate the US Treasury securities market and/or (ii) conspired to prevent the creation of certain platforms by boycotting or threatening to boycott such trading platforms. The court dismissed the consolidated action in March 2021. The plaintiffs have filed an amended complaint, which the defendants have moved to dismiss. In addition, certain plaintiffs have filed a related, direct action against BCI and certain other financial institutions, alleging that defendants conspired to fix and manipulate the US Treasury securities market in violation of the Antitrust Act, the CEA and state common law. Supranational, Sovereign and Agency bonds civil actions Civil antitrust actions have been filed in the SDNY and Federal Court of Canada in Toronto against Barclays Bank PLC, BCI, BX, Barclays Capital Securities Limited and, with respect to the civil action filed in Canada only, Barclays Capital Canada, Inc. and other financial institutions alleging that the defendants conspired to fix prices and restrain competition in the market for US dollar-denominated Supranational, Sovereign and Agency bonds. In one of the actions filed in the SDNY, the court granted the defendants’ motions to dismiss the plaintiffs’ complaint. The dismissal was affirmed on appeal. The plaintiffs have voluntarily dismissed the other SDNY action. In the Federal Court of Canada action, the plaintiffs reached settlements with a small number of banks in 2020 (not including Barclays Capital Canada, Inc.), but the plaintiffs have not commenced the class certification process and the action remains at an early stage. Variable Rate Demand Obligations civil actions Civil actions have been filed against Barclays Bank PLC and BCI and other financial institutions alleging the defendants conspired or colluded to artificially inflate interest rates set for Variable Rate Demand Obligations (VRDOs). VRDOs are municipal bonds with interest rates that reset on a periodic basis, most commonly weekly. Two actions in state court have been filed by private plaintiffs on behalf of the states of Illinois and California. Three putative class action complaints, two of which have been consolidated, have been filed in the SDNY (the third complaint was filed in June 2021). In the consolidated SDNY class action, certain of the plaintiff’s claims were dismissed in November 2020. In the California action, the plaintiffs’ claims were dismissed in June 2021. The plaintiffs may appeal. Government bond civil actions In a putative class action filed in the SDNY in 2019, plaintiffs alleged that BCI and certain other bond dealers conspired to fix the prices of US Government sponsored entity bonds in violation of US antitrust law. BCI agreed to a settlement of $87m, which received final court approval in 2020. Separately, various entities in Louisiana, including the Louisiana Attorney General and the City of Baton Rouge, have commenced litigation against Barclays Bank PLC and other financial institutions making similar allegations as the SDNY class action plaintiffs. The parties have reached a settlement to resolve these matters. The financial impact of the settlement is not expected to be material to the Group’s operating results, cash flows or financial position. In 2018, a separate putative class action against various financial institutions including Barclays PLC, Barclays Bank PLC, BCI, Barclays Bank Mexico, S.A., and certain other subsidiaries of the Group was consolidated in the SDNY. The plaintiffs asserted antitrust and state law claims arising out of an alleged conspiracy to fix the prices of Mexican Government bonds. Barclays PLC has settled the claim for $5.7m, which is subject to final court approval. Odd-lot corporate bonds antitrust class action In 2020, BCI, together with other financial institutions, were named as defendants in a putative class action. The complaint alleges a conspiracy to boycott developing electronic trading platforms for odd-lots and price fixing. Plaintiffs demand unspecified money damages. The defendants have filed a motion to dismiss. Interest rate swap and credit default swap US civil actions Barclays PLC, Barclays Bank PLC and BCI, together with other financial institutions that act as market makers for interest rate swaps (IRS) are named as defendants in several antitrust class actions which were consolidated in the SDNY in 2016. The complaints allege the defendants conspired to prevent the development of exchanges for IRS and demand unspecified money damages. In 2018, trueEX LLC filed an antitrust class action in the SDNY against a number of financial institutions including Barclays PLC, Barclays Bank PLC and BCI based on similar allegations with respect to trueEX LLC’s development of an IRS platform. In 2017, Tera Group Inc. filed a separate civil antitrust action in the SDNY claiming that certain conduct alleged in the IRS cases also caused the plaintiff to suffer harm with respect to the Credit Default Swaps market. In 2018 and 2019, respectively, the court dismissed certain claims in both cases for unjust enrichment and tortious interference but denied motions to dismiss the federal and state antitrust claims, which remain pending. BDC Finance L.L.C. In 2008, BDC Finance L.L.C. (BDC) filed a complaint in the Supreme Court of the State of New York (NY Supreme Court), demanding damages of $298m, alleging that Barclays Bank PLC had breached a contract in connection with a portfolio of total return swaps governed by an ISDA Master Agreement (the Agreement). Following a trial, the court ruled in 2018 that Barclays Bank PLC was not a defaulting party, which was affirmed on appeal. In April 2021, the trial court entered judgement in favour of Barclays Bank PLC for $3.3m and as yet to be determined legal fees and costs, BDC has appealed. In 2011, BDC’s investment advisor, BDCM Fund Adviser, L.L.C. and its parent company, Black Diamond Capital Holdings, L.L.C. also sued Barclays Bank PLC and BCI in Connecticut State Court for unspecified damages allegedly resulting from Barclays Bank PLC’s conduct relating to the Agreement, asserting claims for violation of the Connecticut Unfair Trade Practices Act and tortious interference with business and prospective business relations. This case is currently stayed. Civil actions in respect of the US Anti-Terrorism Act There are a number of civil actions, on behalf of more than 4,000 plaintiffs, filed in US federal courts in the US District Court in the Eastern District of New York (EDNY) and SDNY against Barclays Bank PLC and a number of other banks. The complaints generally allege that Barclays Bank PLC and those banks engaged in a conspiracy to facilitate US dollar-denominated transactions for the Iranian Government and various Iranian banks, which in turn funded acts of terrorism that injured or killed plaintiffs or plaintiffs’ family members. The plaintiffs seek to recover damages for pain, suffering and mental anguish under the provisions of the US Anti-Terrorism Act, which allow for the trebling of any proven damages. The court granted the defendants’ motions to dismiss three out of the six actions in the EDNY. Plaintiffs have appealed in one action. The remaining actions are stayed pending decisions on the appeal. Out of the two actions in the SDNY, the court also granted the defendants’ motion to dismiss one action. The remaining action is stayed pending any appeal in the former case. Shareholder derivative action In November 2020, a purported Barclays shareholder filed a putative derivative action in New York state court against BCI and a number of current and former members of the Board of Directors of Barclays PLC and senior executives or employees of the Group. The shareholder filed the claim on behalf of nominal defendant Barclays PLC, alleging that the individual defendants harmed the company through breaches of their duties, including under the Companies Act 2006. The plaintiff seeks damages on behalf of Barclays PLC for the losses that Barclays PLC allegedly suffered as a result of these alleged breaches. An amended complaint was filed in April 2021, which BCI and certain other defendants have moved to dismiss. Derivative transactions civil action In July 2021, Vestia (a Dutch housing association) issued a claim against Barclays Bank PLC in the UK in the High Court in relation to a series of derivative transactions entered into with Barclays Bank PLC between 2008 and 2012. The claim has not been served on Barclays. Skilled person review and associated matters In August 2020, the FCA granted an application by Clydesdale Financial Services Limited (CFS), which trades as Barclays Partner Finance and houses Barclays’ point-of-sale finance business, for a validation order with respect to certain loans to customers brokered by Azure Services Limited (ASL), a timeshare operator, which did not, at the point of sale, hold the necessary broker licence. As a condition to the validation order, the FCA required CFS to undertake a skilled person review of the assessment of affordability processes for the loans brokered by ASL (ASL Loans) as well as CFS’ policies and procedures for assessing affordability and oversight of brokers more generally, and dictated a remediation methodology in the event that ASL Loans did not pass the affordability test. CFS has voluntarily agreed to remediate the ASL Loans, which is expected to amount to £37m, in accordance with the FCA’s methodology. The remaining scope of the skilled person review is ongoing and the skilled person is expected to report in the fourth quarter of 2021. It is not currently possible to predict the outcome of the skilled person review and/or whether remediation activity will be undertaken or required in relation to other parts of CFS’ loan portfolio and the scope of, and methodology for, any such remediation. 2. Barclays PLC, Barclays Bank PLC and Barclays Bank UK PLC Investigation into UK cards’ affordability The FCA is investigating certain aspects of the affordability assessment processes used by Barclays Bank UK PLC and Barclays Bank PLC for credit card applications made to Barclays’ UK credit card business. Barclays is providing information in cooperation with the investigation. HM Revenue & Customs (HMRC) assessments concerning UK Value Added Tax In 2018, HMRC issued notices that have the effect of removing certain overseas subsidiaries that have operations in the UK from Barclays’ UK VAT group, in which group supplies between members are generally free from VAT. The notices have retrospective effect and correspond to assessments of £181m (inclusive of interest), of which Barclays would expect to attribute an amount of approximately £128m to Barclays Bank UK PLC and £53m to Barclays Bank PLC. HMRC’s decision has been appealed to the First Tier Tribunal (Tax Chamber). Local authority civil actions concerning LIBOR Following settlement by Barclays Bank PLC of various governmental investigations concerning certain benchmark interest rate submissions referred to above in ‘Investigations into LIBOR and other benchmarks and related civil actions’, in the UK, certain local authorities have brought claims against Barclays Bank PLC and Barclays Bank UK PLC asserting that they entered into loans in reliance on misrepresentations made by Barclays Bank PLC in respect of its conduct in relation to LIBOR. Barclays Bank PLC and Barclays Bank UK PLC were successful in their applications to strike out the claims. One local authority has obtained permission to pursue an appeal against this decision, while the claims brought by the other local authorities have been settled on terms such that the parties have agreed not to pursue these claims and to bear their own costs. 3. Barclays PLC Alternative trading systems Barclays PLC has been named as a defendant in a claim brought in the UK in the High Court by various shareholders regarding Barclays PLC’s share price based on the allegations contained within a complaint by the New York State Attorney General (NYAG) in 2014. The NYAG complaint was filed against Barclays PLC and BCI in the NY Supreme Court alleging, among other things, that Barclays PLC and BCI engaged in fraud and deceptive practices in connection with LX, BCI’s SEC-registered alternative trading system. Such claim was settled in 2016, as previously disclosed. This new shareholder claim is seeking unquantified damages. General The Group is engaged in various other legal, competition and regulatory matters in the UK, the US and a number of other overseas jurisdictions. It is subject to legal proceedings brought by and against the Group which arise in the ordinary course of business from time to time, including (but not limited to) disputes in relation to contracts, securities, debt collection, consumer credit, fraud, trusts, client assets, competition, data management and protection, intellectual property, money laundering, financial crime, employment, environmental and other statutory and common law issues. The Group is also subject to enquiries and examinations, requests for information, audits, investigations and legal and other proceedings by regulators, governmental and other public bodies in connection with (but not limited to) consumer protection measures, compliance with legislation and regulation, wholesale trading activity and other areas of banking and business activities in which the Group is or has been engaged. The Group is cooperating with the relevant authorities and keeping all relevant agencies briefed as appropriate in relation to these matters and others described in this note on an ongoing basis. At the present time, Barclays PLC does not expect the ultimate resolution of any of these other matters to have a material adverse effect on the Group’s financial position. However, in light of the uncertainties involved in such matters and the matters specifically described in this note, there can be no assurance that the outcome of a particular matter or matters (including formerly active matters or those matters arising after the date of this note) will not be material to Barclays PLC’s

Related party transactions

Related party transactions	6 Months Ended
	Jun. 30, 2021
Disclosure of transactions between related parties [abstract]
Related party transactions	Related party transactionsRelated party transactions in the half year ended 30 June 2021 were similar in nature to those disclosed in the Barclays PLC Annual Report 2020. No related party transactions that have taken place in the half year ended 30 June 2021 have materially affected the financial position or the performance of the Group during this period.

Interest rate benchmark reform

Interest rate benchmark reform	6 Months Ended
	Jun. 30, 2021
Interest rate benchmark reform [Abstract]
Interest rate benchmark reform	Interest rate benchmark reform Following the financial crisis, the reform and replacement of benchmark interest rates such as LIBOR has become a priority for global regulators. The FCA and other global regulators have instructed market participants to prepare for the cessation of LIBOR after the end of 2021, and to adopt RFRs. While it is expected that most reforms affecting the Group will be completed by the end of 2021, consultations and regulatory changes are in progress and as certain US Dollar tenors will continue to be published up to mid-2023, significant remediation efforts will continue beyond the end of 2021. How the Group is managing the transition to alternative benchmark rates Barclays has established a Group-wide LIBOR Transition Programme, further detail on the transition programme is available in the Barclays PLC Annual Report 2020 (page 367). In March 2021, the FCA announced the dates that panel bank submissions for all LIBOR settings will cease, after which representative LIBOR rates will no longer be available, these are: immediately after 31 December 2021, in the case of all sterling, euro, Swiss franc and Japanese yen settings, and the 1-week and 2-month US dollar settings; and immediately after 30 June 2023, in the case of the remaining US dollar settings. Throughout 2021, the FCA will consult with market participants to require continued publication on a ‘synthetic’ basis for some sterling LIBOR settings and, for 1 additional year, some Japanese yen LIBOR settings. Approaches to transition exposure expiring post the expected end dates for LIBOR vary by product and nature of counterparty. The transition we are undertaking is at the request of the regulators, in line with their expectations and according to the regulatory endorsed timetable. The rates to which clients and customers are being transitioned are endorsed by the regulators. We are making disclosures as part of the transition to clarify the rate to be applied and the potential risks inherent in the transition. Barclays is actively engaging with counterparties to transition or include appropriate fallback provisions and transition mechanisms in its floating rate assets and liabilities with maturities after 2021, when most IBORs are expected to cease to be published, or will be published on a non-representative basis for a limited time. Barclays is working with central clearing counterparties where the transition of cleared derivative contracts will follow a market-wide, standardised approach to reform. Barclays is working to the UK Risk Free Rate Working Group (RFRWG) target of completion of active conversion of, and/or addition of robust fallbacks to legacy GBP LIBOR contracts, where viable by the end of Q321. Additionally, plans are in place to address non-GBP and other official sector industry milestones and targets. Progress made during H121 Building on the progress made in 2020, the Group has delivered further alternative RFR product capabilities and alternatives to LIBOR across loans, bonds and derivatives. Client outreach is progressing to plan and we have continued to engage actively with customers and counterparties to transition or include the appropriate fallback provisions. The Group has in place detailed plans, processes and procedures to support the transition of the remainder during 2021. Barclays has adhered to the ISDA IBOR Fallbacks Protocol for its major derivative dealing entities and we continue to track progress and engage with clients on their own adherence. Following the progress made during 2020, the Group continues to deliver technology and business process changes in preparation for LIBOR cessation and transitions to RFRs that will be necessary during 2021 and beyond in line with official sector expectations and milestones. The Group met the Q121 UK RFRWG milestone to cease initiation of GBP LIBOR linked loans, securitisations or linear derivatives and the Q221 milestones to cease initiation of new non-linear derivatives, exchange traded futures and Bank Of Japan milestone to cease issuance of JPY LIBOR linked loans and bonds. The Group has put in place controls so that any exceptions or exemptions are approved, and is taking a similar approach to forthcoming cessation milestones.

Barclays PLC parent company bal

Barclays PLC parent company balance sheet	6 Months Ended
	Jun. 30, 2021
Disclosure of subsidiaries [abstract]
Barclays PLC parent company balance sheet	Barclays PLC parent company balance sheet As at 30.06.21 As at 31.12.20 Assets £m £m Investment in subsidiaries 58,828 58,886 Loans and advances to subsidiaries 23,295 24,710 Financial assets at fair value through the income statement 21,046 17,521 Derivative financial instruments 2 7 Other assets 19 65 Total assets 103,190 101,189 Liabilities Deposits at amortised cost 476 482 Cash collateral and settlement balances — — Debt securities in issue 26,663 28,428 Subordinated liabilities 9,170 7,724 Financial liabilities designated at fair value 12,130 9,507 Other liabilities 135 176 Total liabilities 48,574 46,317 Equity Called up share capital 4,249 4,340 Share premium account 319 297 Other equity instruments 11,169 11,169 Other reserves 488 394 Retained earnings 38,391 38,672 Total equity 54,616 54,872 Total liabilities and equity 103,190 101,189 Investment in subsidiaries The investment in subsidiaries of £58,828m (December 2020: £58,886m) predominantly relates to investments in Barclays Bank PLC and Barclays Bank UK PLC, as well as holdings of their AT1 securities of £10,995m (December 2020: £10,995m). Barclays PLC considers the carrying value of its investment in subsidiaries to be fully recoverable. Financial assets and liabilities designated at fair value Financial liabilities designated at fair value of £12,130m (December 2020: £9,507m) comprises material issuances during the period of €750m Floating Notes, $1,000m Fixed Rate Resetting Senior Callable Notes, 600m AUD Fixed-to-Floating and Floating Rate Debt Instruments, and 77,000m JPY Fixed Rate Resetting Senior Callable Notes. The proceeds raised through these transactions were used to invest in subsidiaries of Barclays PLC which are included within the financial assets designated at fair value through the income statement balance of £21,046m (December 2020: £17,521m). Loans and advances to subsidiaries During the period, loans and advances to subsidiaries decreased by £1,415m to £23,295m (December 2020: £24,710m). The decrease was driven by the maturity of £2,200m senior loans to Barclays Bank PLC and a foreign exchange impact of £500m due to appreciation of GBP against major currencies (although the negative FX impact is offset across the balance sheet liabilities). There was also a £700m decrease in relation to the share buyback which took place in Q1 2020. This decrease was partially offset by £1,600m of new issuances of dated subordinated notes by Barclays Bank PLC to Barclays PLC and £776m dividend receipts from Barclays Bank PLC and Barclays Execution Services Limited. Subordinated liabilities and debt securities in issue During H121, Barclays PLC issued €1,000m and $1,000m of Fixed Rate Resetting Subordinated Callable Notes, which is included within the subordinated liabilities balance of £9,170m (December 2020: £7,724m). Debt securities in issue of £26,663m (December 2020: £28,428m) have reduced in the year due to the £2,200m maturity of senior issuances, offset in part by new issuances of €1,250m. Other equity instruments Other equity instruments comprises AT1 securities issued by Barclays PLC. There have been no new issuances or redemptions during the period. Other reserves As at 30 June 2021, there was a balance of £488m (December 2020: £394m) in other reserves. The increase is due to the repurchase of shares as part of the share buyback. Management of internal investments, loans and advances Barclays PLC retains the discretion to manage the nature of its internal investments in subsidiaries according to their regulatory and business needs. Barclays PLC may invest capital and funding into Barclays Bank PLC, Barclays Bank UK PLC and other Group subsidiaries such as Barclays Execution Services Limited and the US Intermediate Holding Company (IHC).

Credit Risk

Credit Risk	6 Months Ended
	Jun. 30, 2021
Disclosure of credit risk exposure [abstract]
Credit Risk	Loans and advances at amortised cost by stage The table below presents an analysis of loans and advances at amortised cost by gross exposure, impairment allowance, impairment charge and coverage ratio by stage allocation and business segment as at 30 June 2021. Also included are off-balance sheet loan commitments and financial guarantee contracts by gross exposure, impairment allowance and coverage ratio by stage allocation as at 30 June 2021. Impairment allowance under IFRS 9 considers both the drawn and the undrawn counterparty exposure. For retail portfolios, the total impairment allowance is allocated to the drawn exposure to the extent that the allowance does not exceed the exposure, as ECL is not reported separately. Any excess is reported on the liability side of the balance sheet as a provision. For wholesale portfolios, the impairment allowance on the undrawn exposure is reported on the liability side of the balance sheet as a provision. Gross exposure Impairment allowance Net exposure Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 30.06.21 £m £m £m £m £m £m £m £m £m Barclays UK 158,587 23,576 2,715 184,878 313 1,035 944 2,292 182,586 Barclays International 23,286 2,886 1,760 27,932 575 781 1,004 2,360 25,572 Head Office 4,003 502 760 5,265 3 39 358 400 4,865 Total Barclays Group retail 185,876 26,964 5,235 218,075 891 1,855 2,306 5,052 213,023 Barclays UK 36,069 1,727 1,081 38,877 63 49 89 201 38,676 Barclays International 82,515 13,617 1,425 97,557 231 329 673 1,233 96,324 Head Office 522 3 32 557 — — 31 31 526 Total Barclays Group wholesale 1 119,106 15,347 2,538 136,991 294 378 793 1,465 135,526 Total loans and advances at amortised cost 304,982 42,311 7,773 355,066 1,185 2,233 3,099 6,517 348,549 Off-balance sheet loan commitments and financial guarantee contracts 2 298,150 45,696 664 344,510 228 436 49 713 343,797 Total 3 603,132 88,007 8,437 699,576 1,413 2,669 3,148 7,230 692,346 As at 30.06.21 Half year ended 30.06.21 Coverage ratio Loan impairment release and loan loss rate Stage 1 Stage 2 Stage 3 Total Loan impairment release Loan loss rate % % % % £m bps Barclays UK 0.2 4.4 34.8 1.2 (259) — Barclays International 2.5 27.1 57.0 8.4 (19) — Head Office 0.1 7.8 47.1 7.6 (6) — Total Barclays Group retail 0.5 6.9 44.0 2.3 (284) — Barclays UK 0.2 2.8 8.2 0.5 (23) — Barclays International 0.3 2.4 47.2 1.3 (75) — Head Office — — 96.9 5.6 — — Total Barclays Group wholesale 1 0.2 2.5 31.2 1.1 (98) — Total loans and advances at amortised cost 0.4 5.3 39.9 1.8 (382) — Off-balance sheet loan commitments and financial guarantee contracts 2 0.1 1.0 7.4 0.2 (343) Other financial assets subject to impairment 3 (17) Total 0.2 3.0 37.3 1.0 (742) 1 Includes Wealth and Private Banking exposures measured on an individual basis, and excludes Business Banking exposures that are managed on a collective basis. The net impact is a difference in total exposure of £7,796m of balances reported as wholesale loans on page 30 in the Loans and advances at amortised cost by product disclosure. 2 Excludes loan commitments and financial guarantees of £21bn carried at fair value. 3 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn and impairment allowance of £114m. This comprises £9m ECL on £185.8bn Stage 1 assets, £3m on £58m Stage 2 fair value through other comprehensive income assets, cash collateral and settlement balances and £102m on £109m Stage 3 other assets. Gross exposure Impairment allowance Net exposure Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 31.12.20 £m £m £m £m £m £m £m £m £m Barclays UK 153,250 23,896 2,732 179,878 332 1,509 1,147 2,988 176,890 Barclays International 1 21,048 5,500 1,992 28,540 396 1,329 1,205 2,930 25,610 Head Office 4,267 720 844 5,831 4 51 380 435 5,396 Total Barclays Group retail 178,565 30,116 5,568 214,249 732 2,889 2,732 6,353 207,896 Barclays UK 31,918 4,325 1,126 37,369 13 129 116 258 37,111 Barclays International 1 79,911 16,565 2,270 98,746 288 546 859 1,693 97,053 Head Office 570 — 33 603 — — 31 31 572 Total Barclays Group wholesale 2 112,399 20,890 3,429 136,718 301 675 1,006 1,982 134,736 Total loans and advances at amortised cost 290,964 51,006 8,997 350,967 1,033 3,564 3,738 8,335 342,632 Off-balance sheet loan commitments and financial guarantee contracts 3 289,939 52,891 2,330 345,160 256 758 50 1,064 344,096 Total 4 580,903 103,897 11,327 696,127 1,289 4,322 3,788 9,399 686,728 As at 31.12.20 Year ended 31.12.20 Coverage ratio Loan impairment charge and loan loss rate 5 Stage 1 Stage 2 Stage 3 Total Loan impairment charge Loan loss rate % % % % £m bps Barclays UK 0.2 6.3 42.0 1.7 1,070 59 Barclays International 1 1.9 24.2 60.5 10.3 1,680 589 Head Office 0.1 7.1 45.0 7.5 91 156 Total Barclays Group retail 0.4 9.6 49.1 3.0 2,841 133 Barclays UK — 3.0 10.3 0.7 154 41 Barclays International 1 0.4 3.3 37.8 1.7 914 93 Head Office — — 93.9 5.1 — — Total Barclays Group wholesale 2 0.3 3.2 29.3 1.4 1,068 78 Total loans and advances at amortised cost 0.4 7.0 41.5 2.4 3,909 111 Off-balance sheet loan commitments and financial guarantee contracts 3 0.1 1.4 2.1 0.3 776 Other financial assets subject to impairment 4 153 Total 5 0.2 4.2 33.4 1.4 4,838 1 Private Banking have refined the methodology to classify £5bn of their exposure between Wholesale and Retail during the year. 2 Includes Wealth and Private Banking exposures measured on an individual basis, and excludes Business Banking exposures that are managed on a collective basis. The net impact is a difference in total exposure of £7,551m of balances reported as wholesale loans on page 30 in the Loans and advances at amortised cost by product disclosure. 3 Excludes loan commitments and financial guarantees of £9.5bn carried at fair value. 4 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £180.3bn and impairment allowance of £165m. This comprises £11m ECL on £175.7bn Stage 1 assets, £9m on £4.4bn Stage 2 fair value through other comprehensive income assets,other assets and cash collateral and settlement balances and £145m on £154m Stage 3 other assets. 5 The loan loss rate is 138 bps after applying the total impairment charge of £4,838m. Loans and advances at amortised cost by product The table below presents a breakdown of loans and advances at amortised cost and the impairment allowance with stage allocation by asset classification. Stage 2 As at 30.06.21 Stage 1 Not past due <=30 days past due >30 days past due Total Stage 3 Total Gross exposure £m £m £m £m £m £m £m Home loans 144,103 17,991 1,666 823 20,480 2,235 166,818 Credit cards, unsecured loans and other retail lending 34,537 5,642 300 209 6,151 2,773 43,461 Wholesale loans 126,342 14,760 529 391 15,680 2,765 144,787 Total 304,982 38,393 2,495 1,423 42,311 7,773 355,066 Impairment allowance Home loans 15 56 6 7 69 389 473 Credit cards, unsecured loans and other retail lending 834 1,547 100 120 1,767 1,852 4,453 Wholesale loans 336 381 5 11 397 858 1,591 Total 1,185 1,984 111 138 2,233 3,099 6,517 Net exposure Home loans 144,088 17,935 1,660 816 20,411 1,846 166,345 Credit cards, unsecured loans and other retail lending 33,703 4,095 200 89 4,384 921 39,008 Wholesale loans 126,006 14,379 524 380 15,283 1,907 143,196 Total 303,797 36,409 2,384 1,285 40,078 4,674 348,549 Coverage ratio % % % % % % % Home loans — 0.3 0.4 0.9 0.3 17.4 0.3 Credit cards, unsecured loans and other retail lending 2.4 27.4 33.3 57.4 28.7 66.8 10.2 Wholesale loans 0.3 2.6 0.9 2.8 2.5 31.0 1.1 Total 0.4 5.2 4.4 9.7 5.3 39.9 1.8 As at 31.12.20 Gross exposure £m £m £m £m £m £m £m Home loans 138,639 16,651 1,785 876 19,312 2,234 160,185 Credit cards, unsecured loans and other retail lending 33,021 9,470 544 306 10,320 3,172 46,513 Wholesale loans 119,304 19,501 1,097 776 21,374 3,591 144,269 Total 290,964 45,622 3,426 1,958 51,006 8,997 350,967 Impairment allowance Home Loans 33 57 13 14 84 421 538 Credit cards, unsecured loans and other retail lending 680 2,382 180 207 2,769 2,251 5,700 Wholesale Loans 320 650 50 11 711 1,066 2,097 Total 1,033 3,089 243 232 3,564 3,738 8,335 Net exposure Home loans 138,606 16,594 1,772 862 19,228 1,813 159,647 Credit cards, unsecured loans and other retail lending 32,341 7,088 364 99 7,551 921 40,813 Wholesale loans 118,984 18,851 1,047 765 20,663 2,525 142,172 Total 289,931 42,533 3,183 1,726 47,442 5,259 342,632 Coverage ratio % % % % % % % Home loans — 0.3 0.7 1.6 0.4 18.8 0.3 Credit cards, unsecured loans and other retail lending 2.1 25.2 33.1 67.6 26.8 71.0 12.3 Wholesale loans 0.3 3.3 4.6 1.4 3.3 29.7 1.5 Total 0.4 6.8 7.1 11.8 7.0 41.5 2.4 Loans and advances at amortised cost by selected sectors The table below presents a breakdown of loans and advances at amortised cost and the impairment allowance, with gross exposure and stage allocation for selected industry sectors within the wholesale loans portfolio. The industry sectors have been selected based upon the level of management focus they have received following the onset of the COVID-19 pandemic. The gross loans and advances to selected sectors have decreased over the year driven by repayments and lower drawdowns. The reduction in provisions is informed by the improved macroeconomic outlook used in the Q221 scenario refresh, partially offset by management judgments to reflect the risk of uncertainty still prevailing within these sectors. The wholesale portfolio also benefits from a hedge protection programme that enables effective risk management against systemic losses. An additional £0.1bn (December 2020: £0.1bn) impairment allowance has been applied to the undrawn exposures not included in the table below. Gross exposure Impairment allowance Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 30.06.21 £m £m £m £m £m £m £m £m Air travel 305 322 21 648 3 13 18 34 Hospitality and leisure 4,019 1,907 298 6,224 48 68 49 165 Oil and gas 1,877 465 234 2,576 14 12 128 154 Retail 4,089 962 148 5,199 63 30 44 137 Shipping 485 220 12 717 5 35 — 40 Transportation 1,768 161 102 2,031 20 4 37 61 Total 12,543 4,037 815 17,395 153 162 276 591 Total of Wholesale exposures 10 % 26 % 29 % 12 % 45 % 41 % 32 % 37 % Gross exposure Impairment allowance Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 31.12.20 £m £m £m £m £m £m £m £m Air travel 367 525 56 948 9 27 23 59 Hospitality and leisure 4,440 2,387 313 7,140 53 115 61 229 Oil and gas 1,754 854 465 3,073 31 27 140 198 Retail 3,907 1,153 283 5,343 78 51 108 237 Shipping 308 389 12 709 2 30 1 33 Transportation 1,148 253 125 1,526 19 10 57 86 Total 11,924 5,561 1,254 18,739 192 260 390 842 Total of Wholesale exposures 10 % 26 % 35 % 13 % 60 % 37 % 37 % 40 % The coverage ratio for selected sectors has decreased from 4.5% as at 31 December 2020 to 3.4% as at 30 June 2021. Exposure to UK commercial real estate of £9.4bn, excluding government backed schemes, was in line with 31 December 2020 (£10.0bn). Coverage decreased from 0.98% to 0.61% in the period. Movement in gross exposures and impairment allowance including provisions for loan commitments and financial guarantees The following tables present a reconciliation of the opening to the closing balance of the exposure and impairment allowance. An explanation of the terms 12-month ECL, lifetime ECL and credit-impaired is included in the Barclays PLC Annual Report 2020 on page 296. Transfers between stages in the table have been reflected as if they had taken place at the beginning of the year. The movements are measured over a 6-month period. Loans and advances at amortised cost Stage 1 Stage 2 Stage 3 Total Gross exposure ECL Gross exposure ECL Gross exposure ECL Gross exposure ECL Home loans £m £m £m £m £m £m £m £m As at 1 January 2021 138,639 33 19,312 84 2,234 421 160,185 538 Transfers from Stage 1 to Stage 2 (6,369) (2) 6,369 2 — — — — Transfers from Stage 2 to Stage 1 3,615 21 (3,615) (21) — — — — Transfers to Stage 3 (160) — (337) (7) 497 7 — — Transfers from Stage 3 21 — 119 3 (140) (3) — — Business activity in the year 19,231 2 380 1 — — 19,611 3 Changes to models used for calculation 1 — — — (4) — 38 — 34 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (4,670) (38) (667) 13 (124) (54) (5,461) (79) Final repayments (6,204) (1) (1,081) (2) (220) (8) (7,505) (11) Disposals — — — — — — — — Write-offs 2 — — — — (12) (12) (12) (12) As at 30 June 2021 3 144,103 15 20,480 69 2,235 389 166,818 473 Credit cards, unsecured loans and other retail lending As at 1 January 2021 33,021 680 10,320 2,769 3,172 2,251 46,513 5,700 Transfers from Stage 1 to Stage 2 (1,590) (72) 1,590 72 — — — — Transfers from Stage 2 to Stage 1 4,376 1,080 (4,376) (1,080) — — — — Transfers to Stage 3 (264) (12) (572) (282) 836 294 — — Transfers from Stage 3 30 25 38 14 (68) (39) — — Business activity in the year 3,855 50 58 14 31 8 3,944 72 Changes to models used for calculation 1 — (5) — (33) — 14 — (24) Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 4 (3,134) (866) (808) 310 (123) 282 (4,065) (274) Final repayments (1,757) (46) (99) (17) (140) (50) (1,996) (113) Disposals 5 — — — — (101) (74) (101) (74) Write-offs 2 — — — — (834) (834) (834) (834) As at 30 June 2021 3 34,537 834 6,151 1,767 2,773 1,852 43,461 4,453 1 Changes to models used for calculation include a £34m movement in Home loans, £24m in Credit cards, unsecured loans and other retail lending and £36m in Wholesale loans. These reflect methodology changes made during the year. Barclays continually review the output of models to determine accuracy of the ECL calculation including review of model monitoring, external benchmarking and experience of model operation over an extended period of time. This ensures that the models used continue to reflect the risks inherent across the businesses. 2 In H121, gross write-offs amounted to £1,001m (H120: £953m) and post write-off recoveries amounted to £31m (H120: £15m). Net write-offs represent gross write-offs less post write-off recoveries and amounted to £970m (H120: £938m). 3 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn (December 2020: £180.3bn) and impairment allowance of £114m (December 2020: £165m). This comprises £9m ECL (December 2020: £11m) on £185.8bn stage 1 assets (December 2020: £175.7bn), £3m (December 2020: £9m) on £58m stage 2 fair value through other comprehensive income assets, other assets and cash collateral and settlement balances (December 2020: £4.4bn) and £102m (December 2020: £145m) on £109m stage 3 other assets (December 2020: £154m). 4 Transfers and risk parameter changes include a £0.3bn net release in ECL arising from a reclassification of £2.2bn gross loans and advances from Stage 2 to Stage 1 in Credit cards, unsecured loans and other retail lending. The reclassification followed a review of back-testing of results which indicated that accuracy of origination probability of default characteristics require management adjustments to correct and was first established in Q220. 5 The £101m disposals reported within Credit cards, unsecured loans and other retail lending portfolio relates to debt sales undertaken during the year. The £1.7bn disposal reported within Wholesale loans includes a sale of £0.7bn debt securities as part of Group Treasury Operations and a £1.0bn sale of Barclays Asset Finance. Loans and advances at amortised cost Stage 1 Stage 2 Stage 3 Total Gross exposure ECL Gross exposure ECL Gross exposure ECL Gross exposure ECL Wholesale loans £m £m £m £m £m £m £m £m As at 1 January 2021 119,304 320 21,374 711 3,591 1,066 144,269 2,097 Transfers from Stage 1 to Stage 2 (4,636) (12) 4,636 12 — — — — Transfers from Stage 2 to Stage 1 8,410 188 (8,410) (188) — — — — Transfers to Stage 3 (249) (2) (226) (17) 475 19 — — Transfers from Stage 3 515 14 376 13 (891) (27) — — Business activity in the year 23,266 35 1,181 30 191 22 24,638 87 Changes to models used for calculation 1 — (7) — (29) — — — (36) Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 81 (153) (47) (37) (185) (1) (151) (191) Final repayments (18,854) (39) (3,042) (95) (203) (33) (22,099) (167) Disposals 2 (1,495) (8) (162) (3) (58) (33) (1,715) (44) Write-offs 3 — — — — (155) (155) (155) (155) As at 30 June 2021 4 126,342 336 15,680 397 2,765 858 144,787 1,591 Reconciliation of ECL movement to impairment charge/(release) for the period £m Home loans (53) Credit cards, unsecured loans and other retail lending (339) Wholesale loans (307) ECL movement excluding assets derecognised due to disposals and write-offs (699) Recoveries and reimbursements 5 185 Exchange and other adjustments 6 132 Impairment charge on loan commitments and other financial guarantees (343) Impairment charge on other financial assets 4 (17) Income statement release for the period (742) 1 Changes to models used for calculation include a £34m movement in Home Loans, £24m in Credit cards, unsecured loans and other retail lending and £36m in Wholesale loans. These reflect methodology changes made during the year. Barclays continually review the output of models to determine accuracy of the ECL calculation including review of model monitoring, external benchmarking and experience of model operation over an extended period of time. This ensures that the models used continue to reflect the risks inherent across the businesses. 2 The £101m disposals reported within Credit cards, unsecured loans and other retail lending portfolio relates to debt sales undertaken during the year. The £1.7bn disposal reported within Wholesale loans includes a sale of £0.7bn debt securities as part of Group Treasury Operations and a £1.0bn sale of Barclays Asset Finance. 3 In H121, gross write-offs amounted to £1,001m (H120: £953m) and post write-off recoveries amounted to £31m (H120: £15m). Net write-offs represent gross write-offs less post write-off recoveries and amounted to £970m (H120: £938m). 4 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn (December 2020: £180.3bn) and impairment allowance of £114m (December 2020: £165m). This comprises £9m ECL (December 2020: £11m) on £185.8bn stage 1 assets (December 2020: £175.7bn), £3m (December 2020: £9m) on £58m stage 2 fair value through other comprehensive income assets, other assets and cash collateral and settlement balances (December 2020: £4.4bn) and £102m (December 2020: £145m) on £109m stage 3 other assets (December 2020: £154m). 5 Recoveries and reimbursements includes a net loss in relation to reimbursements from financial guarantee contracts held with third parties of £216m (H120 gain: £279m) and post write off recoveries of £31m (H120: £15m). 6 Includes foreign exchange and interest and fees in suspense. Loan commitments and financial guarantees Stage 1 Stage 2 Stage 3 Total Gross ECL Gross ECL Gross ECL Gross ECL Home loans £m £m £m £m £m £m £m £m As at 1 January 2021 11,861 — 516 — 5 — 12,382 — Net transfers between stages (74) — 71 — 3 — — — Business activity in the year 6,287 — 1 — — — 6,288 — Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (7,397) — (17) — (2) — (7,416) — Limit management and final repayments (238) — (22) — (3) — (263) — As at 30 June 2021 10,439 — 549 — 3 — 10,991 — Credit cards, unsecured loans and other retail lending As at 1 January 2021 114,371 55 12,117 305 229 23 126,717 383 Net transfers between stages 5,784 217 (6,081) (212) 297 (5) — — Business activity in the year 3,378 1 32 1 1 1 3,411 3 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (1,005) (215) 114 63 (248) 4 (1,139) (148) Limit management and final repayments (4,941) (4) (398) (5) (57) (3) (5,396) (12) As at 30 June 2021 117,587 54 5,784 152 222 20 123,593 226 Wholesale loans As at 1 January 2021 163,707 201 40,258 453 2,096 27 206,061 681 Net transfers between stages 682 116 504 (112) (1,186) (4) — — Business activity in the year 37,211 28 2,915 89 12 9 40,138 126 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 1,603 (146) 680 (63) (28) 2 2,255 (207) Limit management and final repayments (33,079) (25) (4,994) (83) (455) (5) (38,528) (113) As at 30 June 2021 170,124 174 39,363 284 439 29 209,926 487 Management adjustments to models for impairment Management adjustments to impairment models are made in the ordinary course of business in order to reflect changes in policy or correct model performance issues identified through model monitoring. These adjustments remain in place until they are incorporated into future model development and are then retired. In addition, they may also be made in response to circumstances or uncertainty at the period end and this is particularly true of the ongoing COVID-19 pandemic. Total management adjustments to impairment allowance are presented by product below. Overview of management adjustments to models for impairment allowance 1 As at 30.06.21 As at 31.12.20 Management adjustments to impairment allowances Proportion of total impairment allowances Management adjustments to impairment allowances Proportion of total impairment allowances £m % £m % Home loans 83 17.5 131 24.3 Credit cards, unsecured loans and other retail lending 1,145 24.5 1,234 20.3 Wholesale loans 643 30.9 23 0.8 Total 1,871 25.9 1,388 14.8 Management adjustments to models for impairment allowance 1 Impairment allowance pre management adjustments 2 Economic uncertainty adjustments Other adjustments Total impairment allowance As at 30.06.21 £m £m £m £m Home loans 390 41 42 473 Credit cards, unsecured loans and other retail lending 3,534 1,398 (253) 4,679 Wholesale loans 1,435 651 (8) 2,078 Total 5,359 2,090 (219) 7,230 As at 31.12.20 Home loans 407 21 110 538 Credit cards, unsecured loans and other retail lending 4,849 1,625 (391) 6,083 Wholesale loans 2,755 421 (398) 2,778 Total 8,011 2,067 (679) 9,399 1 Positive values reflect an increase in impairment allowance. 2 Includes £4.3bn (December 2020: £6.8bn) of modelled ECL, £0.8bn (December 2020: £0.9bn) of individually assessed impairments and £0.3bn (December 2020: £0.3bn) ECL from non-modelled exposures. Economic uncertainty adjustments The COVID-19 pandemic has impacted the global economy since early 2020 and macroeconomic forecasts indicate longer-term impacts that will result in higher unemployment levels and customer and client stress. However, to date, little real credit deterioration has occurred, largely as a result of government and other support measures. Observed 30-day arrears rates have reduced in US cards 1.6% (December 2020: 2.5%; December 2019: 2.7%) and in UK cards 1.4% (December 2020: 1.7%; December 2019: 1.7%) due to payment holidays granted to customers impacted by COVID-19 which reduced the delinquency entrance rate and overall flow through delinquency. However, uncertainty remains as government and other support measures taper down as to whether these schemes have either averted or delayed credit losses. In order to address this uncertainty, adjustments to the modelled provisions were made in 2020. COVID-19 related economic uncertainty adjustments of £2.1bn (December 2020: £2.1bn) continue to be recognised, specifically to address whether support measures have averted or delayed credit losses. However, within this, the approach has been refined and uncertainty is now captured in two distinct ways: firstly, the identification of specific customers and clients who may be more vulnerable to the withdrawal of relief and secondly, macroeconomic and risk parameter uncertainties which are applied at a portfolio level. A summary of the adjustments is provided below: • A £1.2bn adjustment has been applied to customers and clients considered potentially vulnerable to the withdrawal of government and other support schemes. In US consumer card portfolios, the populations identified are those who have higher potential risk indicators and in the UK we have specifically considered the impact of furlough schemes ending (equivalent to UK unemployment increasing to 7.2%). In wholesale portfolios, the populations identified are specific clients who may exhibit greater cross default risk between COVID-19 and other financing exposures, including clients with Bounce Back Loans in Business Banking, and those corporate sectors deemed more vulnerable to the economic impacts of COVID-19. This adjustment is split between credit cards and unsecured loans, £0.9bn, and wholesale loans, £0.3bn • Expert judgement has been used to adjust the probability of default at portfolio level to pre-COVID-19 levels to reflect the impact of temporary support measures on underlying customer and client behaviour. Following a refinement to methodology, this has reduced to £0.5bn from £0.7bn in December 2020. A £(0.1)bn PMA to recognise government guarantees remains in place • Macroeconomic variables which may be temporarily influenced by support measures have been adjusted at a portfolio level enabling the model to consume the economic stress. This is reduced to £0.5bn from £1.2bn at December 2020 as management judgements have been refined towards potentially vulnerable customers and clients as the pandemic evolves Other adjustments Home loans: The low average LTV nature of the UK Home Loans portfolio means that modelled ECL estimates are low in all but the most severe economic scenarios. An adjustment is held to maintain an appropriate level of ECL. Credit cards, unsecured loans and other retail lending: This materially relates to a net release in ECL due to reclassification of loans and advances from Stage 2 to Stage 1 in credit cards and unsecured loans. The reclassification followed a review of back-testing of results which indicated that the accuracy of origination probability of default characteristics requires management adjustments to correct and was first established in Q220. Wholesale loans: Represents the net of adjustments for Business Banking and Investment Bank for model inaccuracies informed by back-testing. An adjustment to offset modelled ECL output in the Investment Bank to limit excessive ECL sensitivity to the macroeconomic variable for Federal Tax Receipts in place at December 2020 is materially reduced due to the Q221 scenario refresh. Measurement uncertainty The Group uses a five-scenario model to calculate ECL. An external consensus forecast is assembled from key sources, including HM Treasury (short and medium-term forecasts), Bloomberg (based on median of economic forecasts) and the Urban Land Institute (for US House Prices), which forms the Baseline scenario. In addition, two adverse scenarios (Downside 1 and Downside 2) and two favourable scenarios (Upside 1 and Upside 2) are derived, with associated probability weightings. The adverse scenarios are calibrated to a broadly similar severity to Barclays’ internal stress tests and stress scenarios provided by regulators whilst also considering IFRS 9 specific sensitivities and non-linearity. Downside 2 is benchmarked to the Bank of England’s stress scenarios and to the most severe scenario from Moody’s inventory, but is not designed to be the same. The favourable scenarios are calibrated to reflect upside risks to the Baseline scenario to the extent that is broadly consistent with recent favourable benchmark scenarios. All scenarios are regenerated at a minimum semi-annually. The scenarios include eight economic variables, (GDP, unemployment, House Price Index (HPI) and base rates, in both the UK and US markets), and expanded variables using statistical models based on historical correlations. The upside and downside shocks are designed to evolve over a five Macroeconomic indicators were refreshed in Q221, with key drivers for the baseline scenario more optimistic than Q420, resulting in a net ECL provision release. In the Baseline scenario, UK GDP returns to the pre-pandemic level by mid-2022 with peak UK unemployment of just over 6% in Q421. In the Upside 2 scenario, effective fiscal stimulus measures, including public investments in infrastructure and skills, provide a boost to demand and confidence, which in turn leads to economic activity in almost all advanced economies returning to the pre-COVID-19 pandemic levels by the end of 2021. Unemployment levels decline back below 5% by H222 in the UK, and below 4% by early 2022 in the US. In the Downside 2 scenario supply and distribution issues slow the vaccination process and the emergence of new virus variants that are not susceptible to the existing vaccines fuels the outbreak again resulting in full national lockdowns in Q321. This leads to significant falls in GDP in Q321 and UK and US unemployment reaching c.10% and 12% respectively. Although the macroeconomic outlook has improved, the Group’s view on uncertainty remains unchanged, believing potential credit deterioration could be seen once government support is removed, particularly in vulnerable areas of the portfolio. In response, economic uncertainty PMAs remained relatively stable at c.£2.1bn. For further details see page 35. Limited defaults have been observed to date in response to the COVID-19 pandemic, partly as a result of government and bank support measures. However, such support measures are scheduled to taper down from Q321 bringing with it uncertainty. Despite improvement in macroeconomic variables in the period, unemployment remains at elevated levels but portfolios are yet to respond, and may not do so until support measures fall away. The methodology for estimating probability weights for each of the scenarios involves a comparison of the distribution of key historical UK and US macroeconomic variables against the forecast paths of the 5 scenarios. The range of forecast paths generated in the calculation of the weights at 30 June 2021 is slightly narrower than 31 December 2020 due to lower levels of uncertainty. The Upside 2 and Downside 2 scenarios are therefore nearer the tails of the distribution than previously resulting in lower weights. See page 40 for probability weightings used at H121. The tables below show the key consensus macroeconomic variables used in the scenarios (3-year annual paths), the probability weights applied to each scenario and the macroeconomic variables by scenario using ‘specific bases’ i.e. the most extreme position of each variable in the context of the scenario, for example, the highest unemployment for downside scenarios and the lowest unemployment for upside scenarios. The 5-year average table provides additional transparency. Baseline average macroeconomic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 4.9 5.6 2.3 UK unemployment 2 5.8 5.7 5.1 UK HPI 3 (0.5) 0.3 3.1 UK bank rate 0.1 0.2 0.4 US GDP 1 5.7 3.9 1.6 US unemployment 4 5.6 4.5 4.4 US HPI 5 3.9 3.5 3.5 US federal funds rate 0.3 0.3 0.7 As at 31.12.20 UK GDP 1 6.3 3.3 2.6 UK unemployment 2 6.7 6.4 5.8 UK HPI 3 2.4 2.3 5.0 UK bank rate — (0.1) — US GDP 1 3.9 3.1 2.9 US unemployment 4 6.9 5.7 5.6 US HPI 5 2.8 4.7 4.7 US federal funds rate 0.3 0.3 0.3 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA House Price Index, relative to prior year end. Downside 2 average economic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 (1.7) 2.0 5.2 UK unemployment 2 7.3 8.2 6.6 UK HPI 3 (5.8) (5.8) 0.2 UK bank rate 0.1 — — US GDP 1 1.5 1.4 2.0 US unemployment 4 8.7 11.0 9.3 US HPI 5 (4.9) (3.0) 1.1 US federal funds rate 0.3 0.3 0.3 As at 31.12.20 UK GDP 1 (3.9) 6.5 2.6 UK unemployment 2 8.0 9.3 7.8 UK HPI 3 (13.6) (10.8) 0.5 UK bank rate (0.2) (0.2) (0.1) US GDP 1 (2.4) 3.6 2.1 US un

Segmental reporting (Tables)

Segmental reporting (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of operating segments [abstract]
Analysis of results by business	Analysis of results by business Barclays Barclays Head Barclays Half year ended 30.06.21 £m £m £m £m Total income 3,199 8,218 (102) 11,315 Credit impairment releases 443 293 6 742 Net operating income/(expenses) 3,642 8,511 (96) 12,057 Operating expenses (2,114) (4,606) (412) (7,132) Litigation and conduct (22) (84) 7 (99) Total operating expenses (2,136) (4,690) (405) (7,231) Other net income 1 — 22 131 153 Profit/(loss) before tax 1,506 3,843 (370) 4,979 As at 30.06.21 £bn £bn £bn £bn Total assets 311.2 1,046.8 18.3 1,376.3 Barclays Barclays Head Barclays Half year ended 30.06.20 £m £m £m £m Total income 3,171 8,654 (204) 11,621 Credit impairment charges (1,064) (2,619) (55) (3,738) Net operating income/(expenses) 2,107 6,035 (259) 7,883 Operating expenses (2,041) (4,405) (117) (6,563) Litigation and conduct (11) (11) (8) (30) Total operating expenses (2,052) (4,416) (125) (6,593) Other net income/(expenses) 1 13 10 (41) (18) Profit/(loss) before tax 68 1,629 (425) 1,272 As at 31.12.20 £bn £bn £bn £bn Total assets 289.1 1,041.8 18.6 1,349.5 1 Other net income/(expenses) represents the share of post-tax results of associates and joint ventures, profit (or loss) on disposal of subsidiaries, associates and joint ventures and gains on acquisitions.
Split of income by geographic region	Split of income by geographic region 1 Half year ended 30.06.21 Half year ended 30.06.20 £m £m United Kingdom 5,895 5,989 Europe 1,222 1,199 Americas 3,608 3,776 Africa and Middle East 20 20 Asia 570 637 Total 11,315 11,621 1 The geographical analysis is based on the location of the office where the transactions are recorded.

Net fee and commission income (

Net fee and commission income (Tables)	6 Months Ended
	Jun. 30, 2021
Fee and commission income (expense) [abstract]
Total fees in scope of IFRS 15 Revenues from Contracts with Customers	Fee and commission income is disaggregated below and includes a total for fees in scope of IFRS 15, Revenue from Contracts with Customers: Barclays UK Barclays International Head Office Total Half year ended 30.06.21 £m £m £m £m Fee type Transactional 408 1,181 — 1,589 Advisory 83 459 1 543 Brokerage and execution 109 553 — 662 Underwriting and syndication — 1,715 — 1,715 Other 35 73 3 111 Total revenue from contracts with customers 635 3,981 4 4,620 Other non-contract fee income — 62 — 62 Fee and commission income 635 4,043 4 4,682 Fee and commission expense (108) (861) (7) (976) Net fee and commission income 527 3,182 (3) 3,706 Barclays UK Barclays International Head Office Total Half year ended 30.06.20 £m £m £m £m Fee type Transactional 386 1,157 — 1,543 Advisory 79 306 1 386 Brokerage and execution 102 685 — 787 Underwriting and syndication — 1,468 — 1,468 Other 38 115 2 155 Total revenue from contracts with customers 605 3,731 3 4,339 Other non-contract fee income — 60 — 60 Fee and commission income 605 3,791 3 4,399 Fee and commission expense (148) (940) (2) (1,090) Net fee and commission income 457 2,851 1 3,309

Staff costs (Tables)

Staff costs (Tables)	6 Months Ended
	Jun. 30, 2021
Classes of employee benefits expense [abstract]
Staff costs	Half year ended 30.06.21 Half year ended 30.06.20 Compensation costs £m £m Upfront bonus charge 824 476 Deferred bonus charge 262 269 Other incentives 6 4 Performance costs 1,092 749 Salaries 2,117 2,153 Social security costs 336 317 Post-retirement benefits 275 268 Other compensation costs 223 254 Total compensation costs 4,043 3,741 Other resourcing costs Outsourcing 171 175 Redundancy and restructuring 23 39 Temporary staff costs 55 58 Other 42 40 Total other resourcing costs 291 312 Total staff costs 4,334 4,053 Barclays Group compensation costs as a % of total income 35.7 32.2

Infrastructure, administratio_2

Infrastructure, administration and general expenses (Tables)	6 Months Ended
	Jun. 30, 2021
Expenses by nature [abstract]
Infrastructure, administration and general expenses	Half year ended 30.06.21 Half year ended 30.06.20 Infrastructure costs £m £m Property and equipment 709 757 Depreciation and amortisation 832 751 Lease payments 20 26 Impairment of property, equipment and intangible assets 304 32 Total infrastructure costs 1,865 1,566 Administration and general expenses Consultancy, legal and professional fees 262 270 Marketing and advertising 163 158 Other administration and general expenses 508 516 Total administration and general expenses 933 944 Total infrastructure, administration and general expenses 2,798 2,510

Tax (Tables)

Tax (Tables)	6 Months Ended
	Jun. 30, 2021
Major components of tax expense (income) [abstract]
Disclosure of deferred taxes	As at 30.06.21 As at 31.12.20 Deferred tax assets and liabilities £m £m USA 1,908 2,049 UK 1,380 886 Other territories 483 509 Deferred tax assets 3,771 3,444 Deferred tax liabilities (8) (15) Analysis of deferred tax assets Temporary differences 2,972 2,709 Tax losses 799 735 Deferred tax assets 3,771 3,444

Non-controlling interests (Tabl

Non-controlling interests (Tables)	6 Months Ended
	Jun. 30, 2021
Non-controlling interests [Abstract]
Non-controlling interest, by group	Profit attributable to Equity attributable to Half year ended 30.06.21 Half year ended 30.06.20 As at 30.06.21 As at 31.12.20 £m £m £m £m Barclays Bank PLC issued: - Preference shares 13 28 529 529 - Upper T2 instruments 3 9 533 533 Other non-controlling interests 3 — 2 23 Total 19 37 1,064 1,085

Earnings per share (Tables)

Earnings per share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings per share [abstract]
Earnings per share	Half year ended 30.06.21 Half year ended 30.06.20 £m £m Profit attributable to ordinary equity holders of the parent 3,812 695 m m Basic weighted average number of shares in issue 17,140 17,294 Number of potential ordinary shares 467 319 Diluted weighted average number of shares 17,607 17,613 p p Basic earnings per ordinary share 22.2 4.0 Diluted earnings per ordinary share 21.7 3.9

Dividends on ordinary shares (T

Dividends on ordinary shares (Tables)	6 Months Ended
	Jun. 30, 2021
Dividends on ordinary shares [Abstract]
Dividends on ordinary shares	Half year ended 30.06.21 Half year ended 30.06.20 Per share Total Per share Total Dividends paid during the period p £m p £m Full year dividend paid during period 1.0 173 — —

Derivative financial instrume_2

Derivative financial instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [abstract]
Total recognised derivative assets/(liabilities)	Contract notional amount Fair value Assets Liabilities As at 30.06.21 £m £m £m Foreign exchange derivatives 5,654,026 66,963 (64,194) Interest rate derivatives 37,888,009 134,734 (123,436) Credit derivatives 920,030 5,469 (5,960) Equity and stock index and commodity derivatives 1,541,007 48,530 (52,444) Derivative assets/(liabilities) held for trading 46,003,072 255,696 (246,034) Derivatives in hedge accounting relationships Derivatives designated as cash flow hedges 91,278 806 — Derivatives designated as fair value hedges 107,879 128 (993) Derivatives designated as hedges of net investments 1,595 6 (7) Derivative assets/(liabilities) designated in hedge accounting relationships 200,752 940 (1,000) Total recognised derivative assets/(liabilities) 46,203,824 256,636 (247,034) As at 31.12.20 Foreign exchange derivatives 5,554,037 84,739 (84,381) Interest rate derivatives 35,257,371 172,144 (162,402) Credit derivatives 847,845 4,605 (5,004) Equity and stock index and commodity derivatives 1,510,718 40,392 (48,008) Derivative assets/(liabilities) held for trading 43,169,971 301,880 (299,795) Derivatives in hedge accounting relationships Derivatives designated as cash flow hedges 74,437 386 — Derivatives designated as fair value hedges 114,556 155 (980) Derivatives designated as hedges of net investments 791 25 — Derivative assets/(liabilities) designated in hedge accounting relationships 189,784 566 (980) Total recognised derivative assets/(liabilities) 43,359,755 302,446 (300,775)

Fair value of financial instr_2

Fair value of financial instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of fair value measurement of assets [abstract]
Assets and liabilities held at fair value disaggregated by valuation technique (fair value hierarchy)	The following table shows the Group’s assets and liabilities that are held at fair value disaggregated by valuation technique (fair value hierarchy) and balance sheet classification: Valuation technique using Quoted market prices Observable inputs Significant unobservable inputs (Level 1) (Level 2) (Level 3) Total As at 30.06.21 £m £m £m £m Trading portfolio assets 73,405 71,282 2,552 147,239 Financial assets at fair value through the income statement 1,229 185,415 7,777 194,421 Derivative financial instruments 11,643 241,336 3,657 256,636 Financial assets at fair value through other comprehensive income 21,375 51,837 48 73,260 Investment property — — 8 8 Total assets 107,652 549,870 14,042 671,564 Trading portfolio liabilities (30,911) (26,058) (17) (56,986) Financial liabilities designated at fair value (142) (263,710) (312) (264,164) Derivative financial instruments (11,227) (230,207) (5,600) (247,034) Total liabilities (42,280) (519,975) (5,929) (568,184) As at 31.12.20 Trading portfolio assets 60,671 65,416 1,863 127,950 Financial assets at fair value through the income statement 4,503 162,142 8,506 175,151 Derivative financial instruments 9,155 288,822 4,469 302,446 Financial assets at fair value through other comprehensive income 19,792 58,743 153 78,688 Investment property — — 10 10 Total assets 94,121 575,123 15,001 684,245 Trading portfolio liabilities (24,391) (22,986) (28) (47,405) Financial liabilities designated at fair value (159) (249,251) (355) (249,765) Derivative financial instruments (8,762) (285,774) (6,239) (300,775) Total liabilities (33,312) (558,011) (6,622) (597,945) The following table shows the Group’s Level 3 assets and liabilities that are held at fair value disaggregated by product type: As at 30.06.21 As at 31.12.20 Assets Liabilities Assets Liabilities £m £m £m £m Interest rate derivatives 916 (1,269) 1,613 (1,615) Foreign exchange derivatives 151 (129) 144 (143) Credit derivatives 100 (364) 196 (351) Equity derivatives 2,490 (3,838) 2,498 (4,112) Commodity derivatives — — 18 (18) Corporate debt 981 (38) 698 (3) Reverse repurchase and repurchase agreements — (161) — (174) Non-asset backed loans 6,338 — 6,394 — Asset backed securities 562 — 767 (24) Equity cash products 402 — 542 — Private equity investments 979 (16) 873 (14) Other 1 1,123 (114) 1,258 (168) Total 14,042 (5,929) 15,001 (6,622) 1 Other includes commercial real estate loans, funds and fund-linked products, asset backed loans, issued debt, commercial paper, government sponsored debt and investment property.
Analysis of movements in Level 3 assets and liabilities	The following table summarises the movements in the balances of Level 3 assets and liabilities during the period. The table shows gains and losses and includes amounts for all financial assets and liabilities that are held at fair value transferred to and from Level 3 during the period. Transfers have been reflected as if they had taken place at the beginning of the period. Asset and liability moves between Level 2 and Level 3 are primarily due to i) an increase or decrease in observable market activity related to an input or ii) a change in the significance of the unobservable input, with assets and liabilities classified as Level 3 if an unobservable input is deemed significant. Level 3 movement analysis Total gains and losses in the period recognised in the income statement Total gains or losses recognised in OCI Transfers As at 01.01.21 Purchases Sales Issues Settle-ments Trading income Other income In Out As at 30.06.21 £m £m £m £m £m £m £m £m £m £m £m Corporate debt 151 305 (87) — — 25 — — 40 (11) 423 Non-asset backed loans 709 620 (131) — (84) 13 — — 124 (106) 1,145 Asset backed securities 686 112 (294) — — (10) — — 43 (48) 489 Equity cash products 214 13 (17) — — 32 — — 29 (9) 262 Other 103 21 — — (51) (1) — — 162 (1) 233 Trading portfolio assets 1,863 1,071 (529) — (135) 59 — — 398 (175) 2,552 Non-asset backed loans 5,580 698 (299) — (687) (119) — — 69 (48) 5,194 Equity cash products 326 160 (194) — — (171) 18 — 1 — 140 Private equity investments 874 106 (9) — (8) (5) 92 — — (71) 979 Other 1,726 2,291 (2,389) — (162) (19) 1 — 16 — 1,464 Financial assets at fair value through the income statement 8,506 3,255 (2,891) — (857) (314) 111 — 86 (119) 7,777 Non-asset backed loans 106 — — — — — — — — (106) — Asset backed securities 47 4 — — (5) — — 2 — — 48 Assets at fair value through other comprehensive income 153 4 — — (5) — — 2 — (106) 48 Investment property 10 — (2) — — — — — — — 8 — — Trading portfolio liabilities (28) (3) 14 — — (7) — — — 7 (17) Financial liabilities designated at fair value (355) — — — 98 7 (2) — (78) 18 (312) Interest rate derivatives (2) 9 — — 33 (121) 4 — 21 (297) (353) Foreign exchange derivatives 1 — — — 58 (6) — — 3 (34) 22 Credit derivatives (155) (117) 2 — (5) 12 (1) — 1 (1) (264) Equity derivatives (1,614) (315) (1) — (32) (221) (1) — 28 808 (1,348) Net derivative financial instruments 1 (1,770) (423) 1 — 54 (336) 2 — 53 476 (1,943) Total 8,379 3,904 (3,407) — (845) (591) 111 2 459 101 8,113 1 Derivative financial instruments are represented on a net basis. On a gross basis, derivative financial assets were £3,657m and derivative financial liabilities were £5,600m. Level 3 movement analysis As at 01.01.20 Purchases Sales Issues Settle- Total gains and losses in the period recognised in the income statement Total gains or losses recognised in OCI Transfers As at 30.06.20 Trading income Other income In Out £m £m £m £m £m £m £m £m £m £m £m Corporate debt 120 25 — — — (26) — — 4 (17) 106 Non-asset backed loans 974 1,926 (740) — (4) (111) — — 97 (320) 1,822 Asset backed securities 656 249 (224) — (76) (12) — — 41 (11) 623 Equity cash products 392 2 (4) — — (67) — — 28 (4) 347 Other 122 48 — — — 2 — — 8 — 180 Trading portfolio assets 2,264 2,250 (968) — (80) (214) — — 178 (352) 3,078 Non-asset backed loans 5,494 1,050 (270) — (410) 381 — — — (58) 6,187 Equity cash products 835 14 — — — (22) (28) — — — 799 Private equity investments 900 19 (6) — (2) 2 (44) — 23 (12) 880 Other 1,271 1,870 (2,017) — (18) (8) 64 — 24 — 1,186 Financial assets at fair value through the income statement 8,500 2,953 (2,293) — (430) 353 (8) — 47 (70) 9,052 Non-asset backed loans 343 79 — — (157) — — (3) — — 262 Asset backed securities 86 — (1) — — 1 — (1) — — 85 Assets at fair value through other comprehensive income 429 79 (1) — (157) 1 — (4) — — 347 Investment property 13 — (1) — — — (2) — 2 (2) 10 Trading portfolio liabilities — — — — — — — — — — — Financial liabilities designated at fair value (362) — 1 (3) — (10) 2 — (22) 25 (369) Interest rate derivatives (206) 18 — — 10 268 1 — 300 (10) 381 Foreign exchange derivatives (7) — — — (12) 89 — — 5 (8) 67 Credit derivatives 198 (258) 11 — (376) 151 1 — 2 8 (263) Equity derivatives (819) (448) (1) — 17 (90) — — (5) (23) (1,369) Net derivative financial instruments 1 (834) (688) 10 — (361) 418 2 — 302 (33) (1,184) Total 10,010 4,594 (3,252) (3) (1,028) 548 (6) (4) 507 (432) 10,934 1 Derivative financial instruments are represented on a net basis. On a gross basis, derivative financial assets were £7,748m and derivative financial liabilities were £8,932m.
Unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	The following table discloses the unrealised gains and losses recognised in the period arising on Level 3 financial assets and liabilities held at the period end. Half year ended 30.06.21 Half year ended 30.06.20 Income statement Other compre hensive income Total Income statement Other compre hensive income Total Trading income Other income Trading income Other income £m £m £m £m £m £m £m £m Trading portfolio assets 35 — — 35 (177) — — (177) Financial assets at fair value through the income statement (201) 114 — (87) 397 (53) — 344 Financial assets at fair value through other comprehensive income — — — — — — (2) (2) Investment properties — — — — — (2) — (2) Trading portfolio liabilities (6) — — (6) — — — — Financial liabilities designated at fair value 7 — — 7 (16) (1) — (17) Net derivative financial instruments (367) — — (367) 248 — — 248 Non-current assets/liabilities held for sale — — — — — — — — Total (532) 114 — (418) 452 (56) (2) 394
Sensitivity analysis of valuations using unobservable inputs	Sensitivity analysis of valuations using unobservable inputs As at 30.06.21 As at 31.12.20 Favourable changes Unfavourable changes Favourable changes Unfavourable changes Income statement Equity Income statement Equity Income statement Equity Income statement Equity £m £m £m £m £m £m £m £m Interest rate derivatives 52 — (83) — 82 — (123) — Foreign exchange derivatives 6 — (10) — 6 — (11) — Credit derivatives 53 — (44) — 55 — (44) — Equity derivatives 185 — (193) — 174 — (179) — Commodity derivatives 2 — (2) — 2 — (2) — Corporate debt 22 — (16) — 16 — (14) — Non-asset backed loans 202 — (310) — 190 3 (409) (3) Equity cash products 130 — (119) — 158 — (141) — Private equity investments 223 — (198) — 199 — (227) — Other 1 18 — (18) — 21 — (21) — Total 893 — (993) — 903 3 (1,171) (3) 1 Other includes commercial real estate loans, funds and fund-linked products, asset backed loans, issued debt, commercial paper, government sponsored debt and investment property.
Fair value adjustments	Key balance sheet valuation adjustments are quantified below: As at 30.06.21 As at 31.12.20 £m £m Exit price adjustments derived from market bid-offer spreads (500) (493) Uncollateralised derivative funding (80) (115) Derivative credit valuation adjustments (210) (268) Derivative debit valuation adjustments 91 113
Comparison of carrying amounts and fair values for assets and liabilities not held at fair value	The following table summarises the fair value of financial assets and liabilities measured at amortised cost on the Group’s balance sheet. As at 30.06.21 As at 31.12.20 Carrying amount Fair value Carrying amount Fair value Financial assets £m £m £m £m Loans and advances at amortised cost 348,549 347,733 342,632 340,516 Reverse repurchase agreements and other similar secured lending 4,459 4,459 9,031 9,031 Financial liabilities Deposits at amortised cost (500,895) (500,933) (481,036) (481,106) Repurchase agreements and other similar secured borrowing (20,005) (20,005) (14,174) (14,174) Debt securities in issue (90,733) (92,746) (75,796) (77,813) Subordinated liabilities (12,839) (13,434) (16,341) (16,918)

Loans and advances and deposi_2

Loans and advances and deposits at amortised cost (Table)	6 Months Ended
	Jun. 30, 2021
Loans and advances and deposits at amortised cost [Abstract]
Loans and advances and deposits at amortised cost	As at 30.06.21 As at 31.12.20 £m £m Loans and advances at amortised cost to banks 11,032 8,900 Loans and advances at amortised cost to customers 309,194 309,927 Debt securities at amortised cost 28,323 23,805 Total loans and advances at amortised cost 348,549 342,632 Deposits at amortised cost from banks 17,165 17,343 Deposits at amortised cost from customers 483,730 463,693 Total deposits at amortised cost 500,895 481,036

Goodwill and intangible assets

Goodwill and intangible assets (Tables)	6 Months Ended
	Jun. 30, 2021
Intangible assets and goodwill [abstract]
Disclosure of goodwill and intangible assets	Goodwill and intangible assets are allocated to business operations according to business segments as follows: As at 30.06.21 As at 31.12.20 Goodwill Intangibles Total Goodwill Intangibles Total £m £m £m £m £m £m Barclays UK 3,560 1,570 5,130 3,560 1,618 5,178 Barclays International 286 2,735 3,021 289 2,435 2,724 Head Office 42 3 45 42 4 46 Total 3,888 4,308 8,196 3,891 4,057 7,948

Subordinated liabilities (Table

Subordinated liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Subordinated liabilities [abstract]
Subordinated liabilities	Half year ended 30.06.21 Year ended 31.12.20 £m £m Opening balance as at 1 January 16,341 18,156 Issuances 1,734 1,438 Redemptions (4,534) (3,464) Other (702) 211 Closing balance 12,839 16,341

Provisions (Tables)

Provisions (Tables)	6 Months Ended
	Jun. 30, 2021
Provisions [abstract]
Provisions	As at 30.06.21 As at 31.12.20 £m £m Customer redress 449 497 Legal, competition and regulatory matters 223 268 Redundancy and restructuring 88 158 Undrawn contractually committed facilities and guarantees 713 1,064 Onerous contracts 14 28 Sundry provisions 285 289 Total 1,772 2,304

Called up share capital (Tables

Called up share capital (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [abstract]
Called up share capital	Ordinary share capital Share premium Total share capital and share premium Half year ended 30.06.21 £m £m £m Opening balance as at 1 January 4,340 297 4,637 Issue of shares under employee share schemes 3 22 25 Repurchase of shares (94) — (94) Closing balance 4,249 319 4,568

Other equity instruments (Table

Other equity instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Miscellaneous components of equity [abstract]
Other equity instruments	Half year ended 30.06.21 Year ended 31.12.20 £m £m Opening balance as at 1 January 11,172 10,871 Issuances — 1,142 Redemptions — (831) Securities held by the Group (5) (10) Closing balance 11,167 11,172

Other reserves (Tables)

Other reserves (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of reserves within equity [abstract]
Other reserves	As at 30.06.21 As at 31.12.20 £m £m Currency translation reserve 2,376 2,871 Fair value through other comprehensive income reserve (245) 5 Cash flow hedging reserve 664 1,575 Own credit reserve (1,001) (954) Other reserves and treasury shares 1,062 964 Total 2,856 4,461

Contingent liabilities and co_2

Contingent liabilities and commitments (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of contingent liabilities [abstract]
Contingent liabilities and commitments	As at 30.06.21 As at 31.12.20 Contingent liabilities £m £m Guarantees and letters of credit pledged as collateral security 13,519 15,665 Performance guarantees, acceptances and endorsements 5,679 5,944 Total 19,198 21,609 Commitments Documentary credits and other short-term trade related transactions 1,017 1,086 Standby facilities, credit lines and other commitments 345,281 331,963 Total 346,298 333,049

Barclays PLC parent company b_2

Barclays PLC parent company balance sheet (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of subsidiaries [abstract]
Barclays PLC parent company balance sheet	As at 30.06.21 As at 31.12.20 Assets £m £m Investment in subsidiaries 58,828 58,886 Loans and advances to subsidiaries 23,295 24,710 Financial assets at fair value through the income statement 21,046 17,521 Derivative financial instruments 2 7 Other assets 19 65 Total assets 103,190 101,189 Liabilities Deposits at amortised cost 476 482 Cash collateral and settlement balances — — Debt securities in issue 26,663 28,428 Subordinated liabilities 9,170 7,724 Financial liabilities designated at fair value 12,130 9,507 Other liabilities 135 176 Total liabilities 48,574 46,317 Equity Called up share capital 4,249 4,340 Share premium account 319 297 Other equity instruments 11,169 11,169 Other reserves 488 394 Retained earnings 38,391 38,672 Total equity 54,616 54,872 Total liabilities and equity 103,190 101,189

Credit Risk (Tables)

Credit Risk (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure of credit risk exposure [abstract]
Disclosure of provision matrix	The table below presents an analysis of loans and advances at amortised cost by gross exposure, impairment allowance, impairment charge and coverage ratio by stage allocation and business segment as at 30 June 2021. Also included are off-balance sheet loan commitments and financial guarantee contracts by gross exposure, impairment allowance and coverage ratio by stage allocation as at 30 June 2021. Impairment allowance under IFRS 9 considers both the drawn and the undrawn counterparty exposure. For retail portfolios, the total impairment allowance is allocated to the drawn exposure to the extent that the allowance does not exceed the exposure, as ECL is not reported separately. Any excess is reported on the liability side of the balance sheet as a provision. For wholesale portfolios, the impairment allowance on the undrawn exposure is reported on the liability side of the balance sheet as a provision. Gross exposure Impairment allowance Net exposure Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 30.06.21 £m £m £m £m £m £m £m £m £m Barclays UK 158,587 23,576 2,715 184,878 313 1,035 944 2,292 182,586 Barclays International 23,286 2,886 1,760 27,932 575 781 1,004 2,360 25,572 Head Office 4,003 502 760 5,265 3 39 358 400 4,865 Total Barclays Group retail 185,876 26,964 5,235 218,075 891 1,855 2,306 5,052 213,023 Barclays UK 36,069 1,727 1,081 38,877 63 49 89 201 38,676 Barclays International 82,515 13,617 1,425 97,557 231 329 673 1,233 96,324 Head Office 522 3 32 557 — — 31 31 526 Total Barclays Group wholesale 1 119,106 15,347 2,538 136,991 294 378 793 1,465 135,526 Total loans and advances at amortised cost 304,982 42,311 7,773 355,066 1,185 2,233 3,099 6,517 348,549 Off-balance sheet loan commitments and financial guarantee contracts 2 298,150 45,696 664 344,510 228 436 49 713 343,797 Total 3 603,132 88,007 8,437 699,576 1,413 2,669 3,148 7,230 692,346 As at 30.06.21 Half year ended 30.06.21 Coverage ratio Loan impairment release and loan loss rate Stage 1 Stage 2 Stage 3 Total Loan impairment release Loan loss rate % % % % £m bps Barclays UK 0.2 4.4 34.8 1.2 (259) — Barclays International 2.5 27.1 57.0 8.4 (19) — Head Office 0.1 7.8 47.1 7.6 (6) — Total Barclays Group retail 0.5 6.9 44.0 2.3 (284) — Barclays UK 0.2 2.8 8.2 0.5 (23) — Barclays International 0.3 2.4 47.2 1.3 (75) — Head Office — — 96.9 5.6 — — Total Barclays Group wholesale 1 0.2 2.5 31.2 1.1 (98) — Total loans and advances at amortised cost 0.4 5.3 39.9 1.8 (382) — Off-balance sheet loan commitments and financial guarantee contracts 2 0.1 1.0 7.4 0.2 (343) Other financial assets subject to impairment 3 (17) Total 0.2 3.0 37.3 1.0 (742) 1 Includes Wealth and Private Banking exposures measured on an individual basis, and excludes Business Banking exposures that are managed on a collective basis. The net impact is a difference in total exposure of £7,796m of balances reported as wholesale loans on page 30 in the Loans and advances at amortised cost by product disclosure. 2 Excludes loan commitments and financial guarantees of £21bn carried at fair value. 3 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn and impairment allowance of £114m. This comprises £9m ECL on £185.8bn Stage 1 assets, £3m on £58m Stage 2 fair value through other comprehensive income assets, cash collateral and settlement balances and £102m on £109m Stage 3 other assets. Gross exposure Impairment allowance Net exposure Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 31.12.20 £m £m £m £m £m £m £m £m £m Barclays UK 153,250 23,896 2,732 179,878 332 1,509 1,147 2,988 176,890 Barclays International 1 21,048 5,500 1,992 28,540 396 1,329 1,205 2,930 25,610 Head Office 4,267 720 844 5,831 4 51 380 435 5,396 Total Barclays Group retail 178,565 30,116 5,568 214,249 732 2,889 2,732 6,353 207,896 Barclays UK 31,918 4,325 1,126 37,369 13 129 116 258 37,111 Barclays International 1 79,911 16,565 2,270 98,746 288 546 859 1,693 97,053 Head Office 570 — 33 603 — — 31 31 572 Total Barclays Group wholesale 2 112,399 20,890 3,429 136,718 301 675 1,006 1,982 134,736 Total loans and advances at amortised cost 290,964 51,006 8,997 350,967 1,033 3,564 3,738 8,335 342,632 Off-balance sheet loan commitments and financial guarantee contracts 3 289,939 52,891 2,330 345,160 256 758 50 1,064 344,096 Total 4 580,903 103,897 11,327 696,127 1,289 4,322 3,788 9,399 686,728 As at 31.12.20 Year ended 31.12.20 Coverage ratio Loan impairment charge and loan loss rate 5 Stage 1 Stage 2 Stage 3 Total Loan impairment charge Loan loss rate % % % % £m bps Barclays UK 0.2 6.3 42.0 1.7 1,070 59 Barclays International 1 1.9 24.2 60.5 10.3 1,680 589 Head Office 0.1 7.1 45.0 7.5 91 156 Total Barclays Group retail 0.4 9.6 49.1 3.0 2,841 133 Barclays UK — 3.0 10.3 0.7 154 41 Barclays International 1 0.4 3.3 37.8 1.7 914 93 Head Office — — 93.9 5.1 — — Total Barclays Group wholesale 2 0.3 3.2 29.3 1.4 1,068 78 Total loans and advances at amortised cost 0.4 7.0 41.5 2.4 3,909 111 Off-balance sheet loan commitments and financial guarantee contracts 3 0.1 1.4 2.1 0.3 776 Other financial assets subject to impairment 4 153 Total 5 0.2 4.2 33.4 1.4 4,838 1 Private Banking have refined the methodology to classify £5bn of their exposure between Wholesale and Retail during the year. 2 Includes Wealth and Private Banking exposures measured on an individual basis, and excludes Business Banking exposures that are managed on a collective basis. The net impact is a difference in total exposure of £7,551m of balances reported as wholesale loans on page 30 in the Loans and advances at amortised cost by product disclosure. 3 Excludes loan commitments and financial guarantees of £9.5bn carried at fair value. 4 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £180.3bn and impairment allowance of £165m. This comprises £11m ECL on £175.7bn Stage 1 assets, £9m on £4.4bn Stage 2 fair value through other comprehensive income assets,other assets and cash collateral and settlement balances and £145m on £154m Stage 3 other assets. 5 The loan loss rate is 138 bps after applying the total impairment charge of £4,838m. Loans and advances at amortised cost by product The table below presents a breakdown of loans and advances at amortised cost and the impairment allowance with stage allocation by asset classification. Stage 2 As at 30.06.21 Stage 1 Not past due <=30 days past due >30 days past due Total Stage 3 Total Gross exposure £m £m £m £m £m £m £m Home loans 144,103 17,991 1,666 823 20,480 2,235 166,818 Credit cards, unsecured loans and other retail lending 34,537 5,642 300 209 6,151 2,773 43,461 Wholesale loans 126,342 14,760 529 391 15,680 2,765 144,787 Total 304,982 38,393 2,495 1,423 42,311 7,773 355,066 Impairment allowance Home loans 15 56 6 7 69 389 473 Credit cards, unsecured loans and other retail lending 834 1,547 100 120 1,767 1,852 4,453 Wholesale loans 336 381 5 11 397 858 1,591 Total 1,185 1,984 111 138 2,233 3,099 6,517 Net exposure Home loans 144,088 17,935 1,660 816 20,411 1,846 166,345 Credit cards, unsecured loans and other retail lending 33,703 4,095 200 89 4,384 921 39,008 Wholesale loans 126,006 14,379 524 380 15,283 1,907 143,196 Total 303,797 36,409 2,384 1,285 40,078 4,674 348,549 Coverage ratio % % % % % % % Home loans — 0.3 0.4 0.9 0.3 17.4 0.3 Credit cards, unsecured loans and other retail lending 2.4 27.4 33.3 57.4 28.7 66.8 10.2 Wholesale loans 0.3 2.6 0.9 2.8 2.5 31.0 1.1 Total 0.4 5.2 4.4 9.7 5.3 39.9 1.8 As at 31.12.20 Gross exposure £m £m £m £m £m £m £m Home loans 138,639 16,651 1,785 876 19,312 2,234 160,185 Credit cards, unsecured loans and other retail lending 33,021 9,470 544 306 10,320 3,172 46,513 Wholesale loans 119,304 19,501 1,097 776 21,374 3,591 144,269 Total 290,964 45,622 3,426 1,958 51,006 8,997 350,967 Impairment allowance Home Loans 33 57 13 14 84 421 538 Credit cards, unsecured loans and other retail lending 680 2,382 180 207 2,769 2,251 5,700 Wholesale Loans 320 650 50 11 711 1,066 2,097 Total 1,033 3,089 243 232 3,564 3,738 8,335 Net exposure Home loans 138,606 16,594 1,772 862 19,228 1,813 159,647 Credit cards, unsecured loans and other retail lending 32,341 7,088 364 99 7,551 921 40,813 Wholesale loans 118,984 18,851 1,047 765 20,663 2,525 142,172 Total 289,931 42,533 3,183 1,726 47,442 5,259 342,632 Coverage ratio % % % % % % % Home loans — 0.3 0.7 1.6 0.4 18.8 0.3 Credit cards, unsecured loans and other retail lending 2.1 25.2 33.1 67.6 26.8 71.0 12.3 Wholesale loans 0.3 3.3 4.6 1.4 3.3 29.7 1.5 Total 0.4 6.8 7.1 11.8 7.0 41.5 2.4 Loans and advances at amortised cost by selected sectors The table below presents a breakdown of loans and advances at amortised cost and the impairment allowance, with gross exposure and stage allocation for selected industry sectors within the wholesale loans portfolio. The industry sectors have been selected based upon the level of management focus they have received following the onset of the COVID-19 pandemic. The gross loans and advances to selected sectors have decreased over the year driven by repayments and lower drawdowns. The reduction in provisions is informed by the improved macroeconomic outlook used in the Q221 scenario refresh, partially offset by management judgments to reflect the risk of uncertainty still prevailing within these sectors. The wholesale portfolio also benefits from a hedge protection programme that enables effective risk management against systemic losses. An additional £0.1bn (December 2020: £0.1bn) impairment allowance has been applied to the undrawn exposures not included in the table below. Gross exposure Impairment allowance Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 30.06.21 £m £m £m £m £m £m £m £m Air travel 305 322 21 648 3 13 18 34 Hospitality and leisure 4,019 1,907 298 6,224 48 68 49 165 Oil and gas 1,877 465 234 2,576 14 12 128 154 Retail 4,089 962 148 5,199 63 30 44 137 Shipping 485 220 12 717 5 35 — 40 Transportation 1,768 161 102 2,031 20 4 37 61 Total 12,543 4,037 815 17,395 153 162 276 591 Total of Wholesale exposures 10 % 26 % 29 % 12 % 45 % 41 % 32 % 37 % Gross exposure Impairment allowance Stage 1 Stage 2 Stage 3 Total Stage 1 Stage 2 Stage 3 Total As at 31.12.20 £m £m £m £m £m £m £m £m Air travel 367 525 56 948 9 27 23 59 Hospitality and leisure 4,440 2,387 313 7,140 53 115 61 229 Oil and gas 1,754 854 465 3,073 31 27 140 198 Retail 3,907 1,153 283 5,343 78 51 108 237 Shipping 308 389 12 709 2 30 1 33 Transportation 1,148 253 125 1,526 19 10 57 86 Total 11,924 5,561 1,254 18,739 192 260 390 842 Total of Wholesale exposures 10 % 26 % 35 % 13 % 60 % 37 % 37 % 40 %
Disclosure of credit risk	The following tables present a reconciliation of the opening to the closing balance of the exposure and impairment allowance. An explanation of the terms 12-month ECL, lifetime ECL and credit-impaired is included in the Barclays PLC Annual Report 2020 on page 296. Transfers between stages in the table have been reflected as if they had taken place at the beginning of the year. The movements are measured over a 6-month period. Loans and advances at amortised cost Stage 1 Stage 2 Stage 3 Total Gross exposure ECL Gross exposure ECL Gross exposure ECL Gross exposure ECL Home loans £m £m £m £m £m £m £m £m As at 1 January 2021 138,639 33 19,312 84 2,234 421 160,185 538 Transfers from Stage 1 to Stage 2 (6,369) (2) 6,369 2 — — — — Transfers from Stage 2 to Stage 1 3,615 21 (3,615) (21) — — — — Transfers to Stage 3 (160) — (337) (7) 497 7 — — Transfers from Stage 3 21 — 119 3 (140) (3) — — Business activity in the year 19,231 2 380 1 — — 19,611 3 Changes to models used for calculation 1 — — — (4) — 38 — 34 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (4,670) (38) (667) 13 (124) (54) (5,461) (79) Final repayments (6,204) (1) (1,081) (2) (220) (8) (7,505) (11) Disposals — — — — — — — — Write-offs 2 — — — — (12) (12) (12) (12) As at 30 June 2021 3 144,103 15 20,480 69 2,235 389 166,818 473 Credit cards, unsecured loans and other retail lending As at 1 January 2021 33,021 680 10,320 2,769 3,172 2,251 46,513 5,700 Transfers from Stage 1 to Stage 2 (1,590) (72) 1,590 72 — — — — Transfers from Stage 2 to Stage 1 4,376 1,080 (4,376) (1,080) — — — — Transfers to Stage 3 (264) (12) (572) (282) 836 294 — — Transfers from Stage 3 30 25 38 14 (68) (39) — — Business activity in the year 3,855 50 58 14 31 8 3,944 72 Changes to models used for calculation 1 — (5) — (33) — 14 — (24) Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 4 (3,134) (866) (808) 310 (123) 282 (4,065) (274) Final repayments (1,757) (46) (99) (17) (140) (50) (1,996) (113) Disposals 5 — — — — (101) (74) (101) (74) Write-offs 2 — — — — (834) (834) (834) (834) As at 30 June 2021 3 34,537 834 6,151 1,767 2,773 1,852 43,461 4,453 1 Changes to models used for calculation include a £34m movement in Home loans, £24m in Credit cards, unsecured loans and other retail lending and £36m in Wholesale loans. These reflect methodology changes made during the year. Barclays continually review the output of models to determine accuracy of the ECL calculation including review of model monitoring, external benchmarking and experience of model operation over an extended period of time. This ensures that the models used continue to reflect the risks inherent across the businesses. 2 In H121, gross write-offs amounted to £1,001m (H120: £953m) and post write-off recoveries amounted to £31m (H120: £15m). Net write-offs represent gross write-offs less post write-off recoveries and amounted to £970m (H120: £938m). 3 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn (December 2020: £180.3bn) and impairment allowance of £114m (December 2020: £165m). This comprises £9m ECL (December 2020: £11m) on £185.8bn stage 1 assets (December 2020: £175.7bn), £3m (December 2020: £9m) on £58m stage 2 fair value through other comprehensive income assets, other assets and cash collateral and settlement balances (December 2020: £4.4bn) and £102m (December 2020: £145m) on £109m stage 3 other assets (December 2020: £154m). 4 Transfers and risk parameter changes include a £0.3bn net release in ECL arising from a reclassification of £2.2bn gross loans and advances from Stage 2 to Stage 1 in Credit cards, unsecured loans and other retail lending. The reclassification followed a review of back-testing of results which indicated that accuracy of origination probability of default characteristics require management adjustments to correct and was first established in Q220. 5 The £101m disposals reported within Credit cards, unsecured loans and other retail lending portfolio relates to debt sales undertaken during the year. The £1.7bn disposal reported within Wholesale loans includes a sale of £0.7bn debt securities as part of Group Treasury Operations and a £1.0bn sale of Barclays Asset Finance. Loans and advances at amortised cost Stage 1 Stage 2 Stage 3 Total Gross exposure ECL Gross exposure ECL Gross exposure ECL Gross exposure ECL Wholesale loans £m £m £m £m £m £m £m £m As at 1 January 2021 119,304 320 21,374 711 3,591 1,066 144,269 2,097 Transfers from Stage 1 to Stage 2 (4,636) (12) 4,636 12 — — — — Transfers from Stage 2 to Stage 1 8,410 188 (8,410) (188) — — — — Transfers to Stage 3 (249) (2) (226) (17) 475 19 — — Transfers from Stage 3 515 14 376 13 (891) (27) — — Business activity in the year 23,266 35 1,181 30 191 22 24,638 87 Changes to models used for calculation 1 — (7) — (29) — — — (36) Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 81 (153) (47) (37) (185) (1) (151) (191) Final repayments (18,854) (39) (3,042) (95) (203) (33) (22,099) (167) Disposals 2 (1,495) (8) (162) (3) (58) (33) (1,715) (44) Write-offs 3 — — — — (155) (155) (155) (155) As at 30 June 2021 4 126,342 336 15,680 397 2,765 858 144,787 1,591 Reconciliation of ECL movement to impairment charge/(release) for the period £m Home loans (53) Credit cards, unsecured loans and other retail lending (339) Wholesale loans (307) ECL movement excluding assets derecognised due to disposals and write-offs (699) Recoveries and reimbursements 5 185 Exchange and other adjustments 6 132 Impairment charge on loan commitments and other financial guarantees (343) Impairment charge on other financial assets 4 (17) Income statement release for the period (742) 1 Changes to models used for calculation include a £34m movement in Home Loans, £24m in Credit cards, unsecured loans and other retail lending and £36m in Wholesale loans. These reflect methodology changes made during the year. Barclays continually review the output of models to determine accuracy of the ECL calculation including review of model monitoring, external benchmarking and experience of model operation over an extended period of time. This ensures that the models used continue to reflect the risks inherent across the businesses. 2 The £101m disposals reported within Credit cards, unsecured loans and other retail lending portfolio relates to debt sales undertaken during the year. The £1.7bn disposal reported within Wholesale loans includes a sale of £0.7bn debt securities as part of Group Treasury Operations and a £1.0bn sale of Barclays Asset Finance. 3 In H121, gross write-offs amounted to £1,001m (H120: £953m) and post write-off recoveries amounted to £31m (H120: £15m). Net write-offs represent gross write-offs less post write-off recoveries and amounted to £970m (H120: £938m). 4 Other financial assets subject to impairment not included in the table above include cash collateral and settlement balances, financial assets at fair value through other comprehensive income and other assets. These have a total gross exposure of £186.0bn (December 2020: £180.3bn) and impairment allowance of £114m (December 2020: £165m). This comprises £9m ECL (December 2020: £11m) on £185.8bn stage 1 assets (December 2020: £175.7bn), £3m (December 2020: £9m) on £58m stage 2 fair value through other comprehensive income assets, other assets and cash collateral and settlement balances (December 2020: £4.4bn) and £102m (December 2020: £145m) on £109m stage 3 other assets (December 2020: £154m). 5 Recoveries and reimbursements includes a net loss in relation to reimbursements from financial guarantee contracts held with third parties of £216m (H120 gain: £279m) and post write off recoveries of £31m (H120: £15m). 6 Includes foreign exchange and interest and fees in suspense. Loan commitments and financial guarantees Stage 1 Stage 2 Stage 3 Total Gross ECL Gross ECL Gross ECL Gross ECL Home loans £m £m £m £m £m £m £m £m As at 1 January 2021 11,861 — 516 — 5 — 12,382 — Net transfers between stages (74) — 71 — 3 — — — Business activity in the year 6,287 — 1 — — — 6,288 — Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (7,397) — (17) — (2) — (7,416) — Limit management and final repayments (238) — (22) — (3) — (263) — As at 30 June 2021 10,439 — 549 — 3 — 10,991 — Credit cards, unsecured loans and other retail lending As at 1 January 2021 114,371 55 12,117 305 229 23 126,717 383 Net transfers between stages 5,784 217 (6,081) (212) 297 (5) — — Business activity in the year 3,378 1 32 1 1 1 3,411 3 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes (1,005) (215) 114 63 (248) 4 (1,139) (148) Limit management and final repayments (4,941) (4) (398) (5) (57) (3) (5,396) (12) As at 30 June 2021 117,587 54 5,784 152 222 20 123,593 226 Wholesale loans As at 1 January 2021 163,707 201 40,258 453 2,096 27 206,061 681 Net transfers between stages 682 116 504 (112) (1,186) (4) — — Business activity in the year 37,211 28 2,915 89 12 9 40,138 126 Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes 1,603 (146) 680 (63) (28) 2 2,255 (207) Limit management and final repayments (33,079) (25) (4,994) (83) (455) (5) (38,528) (113) As at 30 June 2021 170,124 174 39,363 284 439 29 209,926 487
Drivers of loan impairment charge	Overview of management adjustments to models for impairment allowance 1 As at 30.06.21 As at 31.12.20 Management adjustments to impairment allowances Proportion of total impairment allowances Management adjustments to impairment allowances Proportion of total impairment allowances £m % £m % Home loans 83 17.5 131 24.3 Credit cards, unsecured loans and other retail lending 1,145 24.5 1,234 20.3 Wholesale loans 643 30.9 23 0.8 Total 1,871 25.9 1,388 14.8 Management adjustments to models for impairment allowance 1 Impairment allowance pre management adjustments 2 Economic uncertainty adjustments Other adjustments Total impairment allowance As at 30.06.21 £m £m £m £m Home loans 390 41 42 473 Credit cards, unsecured loans and other retail lending 3,534 1,398 (253) 4,679 Wholesale loans 1,435 651 (8) 2,078 Total 5,359 2,090 (219) 7,230 As at 31.12.20 Home loans 407 21 110 538 Credit cards, unsecured loans and other retail lending 4,849 1,625 (391) 6,083 Wholesale loans 2,755 421 (398) 2,778 Total 8,011 2,067 (679) 9,399 1 Positive values reflect an increase in impairment allowance. 2 Includes £4.3bn (December 2020: £6.8bn) of modelled ECL, £0.8bn (December 2020: £0.9bn) of individually assessed impairments and £0.3bn (December 2020: £0.3bn) ECL from non-modelled exposures.
Macroeconomic variables used in the calculation of ECL and the respective scenario probability weighting	Baseline average macroeconomic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 4.9 5.6 2.3 UK unemployment 2 5.8 5.7 5.1 UK HPI 3 (0.5) 0.3 3.1 UK bank rate 0.1 0.2 0.4 US GDP 1 5.7 3.9 1.6 US unemployment 4 5.6 4.5 4.4 US HPI 5 3.9 3.5 3.5 US federal funds rate 0.3 0.3 0.7 As at 31.12.20 UK GDP 1 6.3 3.3 2.6 UK unemployment 2 6.7 6.4 5.8 UK HPI 3 2.4 2.3 5.0 UK bank rate — (0.1) — US GDP 1 3.9 3.1 2.9 US unemployment 4 6.9 5.7 5.6 US HPI 5 2.8 4.7 4.7 US federal funds rate 0.3 0.3 0.3 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA House Price Index, relative to prior year end. Downside 2 average economic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 (1.7) 2.0 5.2 UK unemployment 2 7.3 8.2 6.6 UK HPI 3 (5.8) (5.8) 0.2 UK bank rate 0.1 — — US GDP 1 1.5 1.4 2.0 US unemployment 4 8.7 11.0 9.3 US HPI 5 (4.9) (3.0) 1.1 US federal funds rate 0.3 0.3 0.3 As at 31.12.20 UK GDP 1 (3.9) 6.5 2.6 UK unemployment 2 8.0 9.3 7.8 UK HPI 3 (13.6) (10.8) 0.5 UK bank rate (0.2) (0.2) (0.1) US GDP 1 (2.4) 3.6 2.1 US unemployment 4 13.4 11.9 10.1 US HPI 5 (17.2) (0.7) 0.6 US federal funds rate 0.3 0.3 0.3 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA house price index, relative to prior year end. Downside 1 average economic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 0.6 4.4 4.2 UK unemployment 2 6.4 6.6 5.6 UK HPI 3 (3.1) (2.7) 1.7 UK bank rate 0.1 0.1 0.2 US GDP 1 3.4 2.5 1.6 US unemployment 4 7.4 7.9 6.1 US HPI 5 (0.5) 0.2 2.3 US federal funds rate 0.3 0.3 0.3 As at 31.12.20 UK GDP 1 0.1 6.6 3.2 UK unemployment 2 7.3 8.0 6.9 UK HPI 3 (6.7) (3.5) 1.7 UK bank rate (0.1) (0.1) — US GDP 1 0.4 3.6 2.3 US unemployment 4 11.0 8.9 6.9 US HPI 5 (5.9) 1.8 2.6 US federal funds rate 0.3 0.3 0.3 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA House Price Index, relative to prior year end. Upside 2 average economic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 6.8 9.4 4.0 UK unemployment 2 5.5 4.9 4.4 UK HPI 3 4.6 9.9 11.3 UK bank rate 0.1 0.4 0.6 US GDP 1 6.5 8.2 3.4 US unemployment 4 5.3 3.8 3.8 US HPI 5 6.5 8.0 7.3 US federal funds rate 0.3 0.3 1.1 As at 31.12.20 UK GDP 1 12.2 5.3 3.9 UK unemployment 2 6.2 5.5 4.8 UK HPI 3 6.6 10.4 10.8 UK bank rate 0.1 0.3 0.3 US GDP 1 7.1 4.6 4.0 US unemployment 4 5.5 4.3 4.1 US HPI 5 8.8 9.1 8.9 US federal funds rate 0.3 0.4 0.6 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA House Price Index, relative to prior year end. Upside 1 average economic variables used in the calculation of ECL 2021 2022 2023 As at 30.06.21 % % % UK GDP 1 5.9 7.3 3.0 UK unemployment 2 5.6 5.2 4.7 UK HPI 3 1.5 4.5 7.4 UK bank rate 0.1 0.2 0.6 US GDP 1 6.1 5.8 2.4 US unemployment 4 5.5 4.2 4.2 US HPI 5 6.2 6.8 5.7 US federal funds rate 0.3 0.3 0.9 As at 31.12.20 UK GDP 1 9.3 3.9 3.4 UK unemployment 2 6.4 6.0 5.2 UK HPI 3 4.6 6.1 6.1 UK bank rate 0.1 0.1 0.3 US GDP 1 5.5 4.0 3.7 US unemployment 4 6.0 4.8 4.6 US HPI 5 6.8 6.7 6.3 US federal funds rate 0.3 0.3 0.5 1 Average Real GDP seasonally adjusted change in year. 2 Average UK unemployment rate 16-year+. 3 Change in average yearly UK HPI = Halifax All Houses, All Buyers index, relative to prior year end. 4 Average US civilian unemployment rate 16-year+. 5 Change in average yearly US HPI = FHFA House Price Index, relative to prior year end. Scenario probability weighting Upside 2 Upside 1 Baseline Downside 1 Downside 2 % % % % % As at 30.06.21 Scenario probability weighting 19.6 24.5 26.4 16.9 12.6 As at 31.12.20 Scenario probability weighting 20.2 24.2 24.7 15.5 15.4 Specific bases show the most extreme position of each variable in the context of the scenario, for example, the highest unemployment for downside scenarios, average unemployment for baseline scenarios and lowest unemployment for upside scenarios. GDP and HPI downside and upside scenario data represents the lowest and highest points relative to the start point in the 20 quarter period. Macroeconomic variables (specific bases) 1 Upside 2 Upside 1 Baseline Downside 1 Downside 2 As at 30.06.21 % % % % % UK GDP 2 25.9 20.2 3.3 (4.2) (8.1) UK unemployment 3 4.1 4.3 5.1 7.5 9.8 UK HPI 4 48.2 25.5 1.6 (5.8) (11.8) UK bank rate 3 0.1 0.1 0.4 0.3 0.1 US GDP 2 23.7 18.3 2.8 (0.2) (3.2) US unemployment 3 3.8 4.2 4.7 8.9 12.0 US HPI 4 41.2 32.6 3.6 (1.3) (7.9) US federal funds rate 3 0.3 0.3 0.8 1.5 0.8 As at 31.12.20 UK GDP 2 14.2 8.8 0.7 (22.1) (22.1) UK unemployment 3 4.0 4.0 5.7 8.4 10.1 UK HPI 4 48.2 30.8 3.6 (4.5) (18.3) UK bank rate 3 0.1 0.1 — 0.6 0.6 US GDP 2 15.7 12.8 1.6 (10.6) (10.6) US unemployment 3 3.8 3.8 6.4 13.0 13.7 US HPI 4 42.2 30.9 3.8 (3.7) (15.9) US federal funds rate 3 0.1 0.1 0.3 1.3 1.3 1 UK GDP = Real GDP growth seasonally adjusted; UK unemployment = UK unemployment rate 16-year+; UK HI = Halifax All Houses, All Buyers Index; US GDP = Real GDP growth seasonally adjusted; US unemployment = US civilian unemployment rate 16-year+; US HPI = FHFA House Price Index. 20 quarter period starts from Q121 (2020: Q120). 2 Maximum growth relative to Q420 (2020: Q419), based on 20 quarter period in Upside scenarios; 5-year yearly average Compound Annual Growth Rate (CAGR) in Baseline; minimum growth relative to Q420 (2020: Q419), based on 20 quarter period in Downside scenarios. 3 Lowest quarter in 20 quarter period in Upside scenarios; 5-year average in Baseline; highest quarter in 20 quarter period in Downside scenarios. 4 Maximum growth relative to Q420 (2020: Q419), based on 20 quarter period in Upside scenarios; 5-year quarter end CAGR in Baseline; minimum growth relative to Q420 (2020: Q419), based on 20 quarter period in Downside scenarios. Average basis represents the average quarterly value of variables in the 20 quarter period with GDP and HPI based on yearly average and quarterly CAGRs respectively. Macroeconomic variables (5 year averages) 1 Upside 2 Upside 1 Baseline Downside 1 Downside 2 As at 30.06.21 % % % % % UK GDP 2 5.2 4.2 3.3 2.6 1.8 UK unemployment 3 4.6 4.8 5.1 5.7 6.5 UK HPI 4 8.2 4.7 1.6 — (1.6) UK bank rate 3 0.7 0.6 0.4 0.2 — US GDP 2 4.6 3.7 2.8 2.0 1.4 US unemployment 3 4.1 4.4 4.7 6.3 8.5 US HPI 4 7.1 5.8 3.6 1.6 (0.4) US federal funds rate 3 1.1 0.9 0.8 0.6 0.3 As at 31.12.20 UK GDP 2 2.5 1.6 0.7 0.1 (0.9) UK unemployment 3 5.0 5.3 5.7 6.5 7.2 UK HPI 4 8.2 5.5 3.6 (0.2) (3.6) UK bank rate 3 0.3 0.2 — — (0.1) US GDP 2 2.9 2.4 1.6 0.8 0.1 US unemployment 3 5.3 5.7 6.4 8.3 10.4 US HPI 4 7.3 5.5 3.8 0.8 (3.0) US federal funds rate 3 0.5 0.5 0.3 0.3 0.3 1 UK GDP = Real GDP growth seasonally adjusted; UK unemployment = UK unemployment rate 16-year+; UK HPI = Halifax All Houses, All Buyers Index; US GDP = Real GDP growth seasonally adjusted; US unemployment = US civilian unemployment rate 16-year+; US HPI = FHFA House Price Index. 2 5-year yearly average CAGR, starting 2020 (2020: 2019). 3 5-year average. Period based on 20 quarters from Q121 (2020: Q120). 4 5-year quarter end CAGR, starting Q420 (2020: Q419).
ECL under 100% weighted scenarios for key principal portfolios	Scenarios As at 30.06.21 Weighted Upside 2 Upside 1 Baseline Downside 1 Downside 2 Stage 1 Model Exposure (£m) Home loans 131,134 133,584 132,343 130,694 128,711 126,953 Credit cards, unsecured loans and other retail lending 44,014 45,185 44,809 44,307 42,383 39,252 Wholesale loans 160,174 162,762 162,201 160,564 158,614 152,164 Stage 1 Model ECL (£m) Home loans 4 2 3 4 6 8 Credit cards, unsecured loans and other retail lending 379 269 288 324 456 486 Wholesale loans 248 187 203 224 306 352 Stage 1 Coverage (%) Home loans — — — — — — Credit cards, unsecured loans and other retail lending 0.9 0.6 0.6 0.7 1.1 1.2 Wholesale loans 0.2 0.1 0.1 0.1 0.2 0.2 Stage 2 Model Exposure (£m) Home loans 24,345 21,895 23,136 24,785 26,769 28,526 Credit cards, unsecured loans and other retail lending 7,175 5,733 6,205 6,819 9,066 12,625 Wholesale loans 33,666 31,077 31,639 33,276 35,225 41,676 Stage 2 Model ECL (£m) Home loans 20 13 15 18 27 39 Credit cards, unsecured loans and other retail lending 1,076 733 841 976 1,544 2,517 Wholesale loans 773 594 646 709 939 1,342 Stage 2 Coverage (%) Home loans 0.1 0.1 0.1 0.1 0.1 0.1 Credit cards, unsecured loans and other retail lending 15.0 12.8 13.6 14.3 17.0 19.9 Wholesale loans 2.3 1.9 2.0 2.1 2.7 3.2 Stage 3 Model Exposure (£m) Home loans 1,829 1,829 1,829 1,829 1,829 1,829 Credit cards, unsecured loans and other retail lending 2,374 2,374 2,374 2,374 2,374 2,374 Wholesale loans 1 1,374 1,374 1,374 1,374 1,374 1,374 Stage 3 Model ECL (£m) Home loans 324 307 315 325 337 352 Credit cards, unsecured loans and other retail lending 1,878 1,850 1,864 1,875 1,905 1,920 Wholesale loans 1 67 65 66 67 69 72 Stage 3 Coverage (%) Home loans 17.7 16.8 17.2 17.8 18.4 19.2 Credit cards, unsecured loans and other retail lending 79.1 77.9 78.5 79.0 80.2 80.9 Wholesale loans 1 4.9 4.7 4.8 4.9 5.0 5.2 Total Model ECL (£m) Home loans 348 322 333 347 370 399 Credit cards, unsecured loans and other retail lending 3,333 2,852 2,993 3,175 3,905 4,923 Wholesale loans 1 1,088 846 915 1,000 1,314 1,766 Total Model ECL 4,769 4,020 4,241 4,522 5,589 7,088 1 Material wholesale loan defaults are individually assessed across different recovery strategies. As a result, ECL of £783m is reported as individually assessed impairments in the table below. Reconciliation to total ECL £m Total model ECL 4,769 ECL from individually assessed impairments on stage 3 loans 783 ECL from non-modelled and other management adjustments 1 1,678 Total ECL 7,230 1 Includes £1.9bn post-model adjustments of which £0.4bn is included as part of total model ECL and £0.2bn ECL from non-modelled exposures. The dispersion of results around the Baseline is an indication of uncertainty around the future projections. The disclosure highlights the results of the alternative scenarios enabling the reader to understand the extent of the impact on exposure and ECL from the upside/downside scenarios. Consequently, the use of five scenarios with associated weightings results in a total weighted ECL uplift from the Baseline ECL of 5.5%, largely driven by credit card losses which have more linear loss profiles than UK home loans and wholesale loan positions. Home loans: Total weighted ECL of £348m represents a 0.3% increase over the Baseline ECL (£347m), and coverage ratios remain steady across the Upside scenarios, Baseline and Downside 1 scenario. However, total ECL increases in the Downside 2 scenario to £399m, driven by a significant fall in UK HPI (11.8%) reflecting the non-linearity of the UK portfolio. Credit cards, unsecured loans and other retail lending: Total weighted ECL of £3,333m represents a 5% increase over the Baseline ECL (£3,175m) reflecting the range of economic scenarios used, mainly impacted by unemployment and other key retail variables. Total ECL increases to £4,923m under Downside 2 scenario, mainly driven by Stage 2, where coverage rates increase to 19.9% from a weighted scenario approach of 15% and circa £5.5bn increase in model exposure that meets the Significant Increase in Credit Risk criteria and transitions from Stage 1 to Stage 2. Wholesale loans: Total weighted ECL of £1,088m represents an 8.8% increase over the Baseline ECL (£1,000m) reflecting the range of economic scenarios used, with exposures in the Investment Bank particularly sensitive to the Downside 2 scenario. Scenarios As at 31.12.20 Weighted Upside 2 Upside 1 Baseline Downside 1 Downside 2 Stage 1 Model Exposure (£m) Home loans 131,422 134,100 133,246 132,414 130,547 128,369 Credit cards, unsecured loans and other retail lending 51,952 53,271 52,932 51,995 50,168 48,717 Wholesale loans 149,099 155,812 154,578 152,141 144,646 131,415 Stage 1 Model ECL (£m) Home loans 6 4 5 6 14 42 Credit cards, unsecured loans and other retail lending 392 316 340 372 415 415 Wholesale loans 262 242 258 249 278 290 Stage 1 Coverage (%) Home loans — — — — — — Credit cards, unsecured loans and other retail lending 0.8 0.6 0.6 0.7 0.8 0.9 Wholesale loans 0.2 0.2 0.2 0.2 0.2 0.2 Stage 2 Model Exposure (£m) Home loans 19,180 16,502 17,356 18,188 20,055 22,233 Credit cards, unsecured loans and other retail lending 13,399 10,572 11,579 13,176 16,477 19,322 Wholesale loans 32,677 25,963 27,198 29,635 37,130 50,361 Stage 2 Model ECL (£m) Home loans 37 31 32 33 42 63 Credit cards, unsecured loans and other retail lending 2,207 1,618 1,837 2,138 2,865 3,564 Wholesale loans 1,410 952 1,047 1,223 1,771 2,911 Stage 2 Coverage (%) Home loans 0.2 0.2 0.2 0.2 0.2 0.3 Credit cards, unsecured loans and other retail lending 16.5 15.3 15.9 16.2 17.4 18.4 Wholesale loans 4.3 3.7 3.8 4.1 4.8 5.8 Stage 3 Model Exposure (£m) Home loans 1,778 1,778 1,778 1,778 1,778 1,778 Credit cards, unsecured loans and other retail lending 2,585 2,585 2,585 2,585 2,585 2,585 Wholesale loans 1 2,211 2,211 2,211 2,211 2,211 2,211 Stage 3 Model ECL (£m) Home loans 307 282 286 290 318 386 Credit cards, unsecured loans and other retail lending 2,003 1,947 1,972 2,001 2,055 2,078 Wholesale loans 1 146 128 134 141 157 184 Stage 3 Coverage (%) Home loans 17.3 15.9 16.1 16.3 17.9 21.7 Credit cards, unsecured loans and other retail lending 77.5 75.3 76.3 77.4 79.5 80.4 Wholesale loans 1 6.6 5.8 6.1 6.4 7.1 8.3 Total Model ECL (£m) Home loans 350 317 323 329 374 491 Credit cards, unsecured loans and other retail lending 4,602 3,881 4,149 4,511 5,335 6,057 Wholesale loans 1 1,818 1,322 1,439 1,613 2,206 3,385 Total Model ECL 6,770 5,520 5,911 6,453 7,915 9,933 1 Material wholesale loan defaults are individually assessed across different recovery strategies. As a result, ECL of £902m is reported as individually assessed impairments in the table below. Reconciliation to total ECL 1 £m Total model ECL 6,770 ECL from individually assessed impairments on stage 3 loans 902 ECL from non-modelled and other management adjustments 1,727 Total ECL 9,399 1 Includes £1.4bn of post-model adjustments and £0.3bn ECL from non-modelled exposures.

Segmental reporting - Analysis

Segmental reporting - Analysis of results by business (Details) - GBP (£) £ in Millions	6 Months Ended			12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020		Dec. 31, 2020
Disclosure of operating segments [line items]
Total income	£ 11,315	£ 11,621
Credit impairment releases/(charges)	742	(3,738)		£ (4,838)
Net operating income	12,057	7,883
Operating expenses	(7,132)	(6,563)
Litigation and conduct	(99)	(30)
Total operating expenses	(7,231)	(6,593)
Other net income/(expenses)	153	(18)
Profit before tax	4,979	1,272	[1]
Total assets	1,376,333			1,349,514
Operating segments | Barclays UK
Disclosure of operating segments [line items]
Total income	3,199	3,171
Credit impairment releases/(charges)	443	(1,064)
Net operating income	3,642	2,107
Operating expenses	(2,114)	(2,041)
Litigation and conduct	(22)	(11)
Total operating expenses	(2,136)	(2,052)
Other net income/(expenses)	0	13
Profit before tax	1,506	68
Total assets	311,200			289,100
Operating segments | Barclays International
Disclosure of operating segments [line items]
Total income	8,218	8,654
Credit impairment releases/(charges)	293	(2,619)
Net operating income	8,511	6,035
Operating expenses	(4,606)	(4,405)
Litigation and conduct	(84)	(11)
Total operating expenses	(4,690)	(4,416)
Other net income/(expenses)	22	10
Profit before tax	3,843	1,629
Total assets	1,046,800			1,041,800
Head Office
Disclosure of operating segments [line items]
Total income	(102)	(204)
Credit impairment releases/(charges)	6	(55)
Net operating income	(96)	(259)
Operating expenses	(412)	(117)
Litigation and conduct	7	(8)
Total operating expenses	(405)	(125)
Other net income/(expenses)	131	(41)
Profit before tax	(370)	£ (425)
Total assets	£ 18,300			£ 18,600
[1]	H120 comparative figures have been restated to make the condensed cash flow statement more relevant following a review of the disclosure and the accounting policies applied that was undertaken in H220. Amendments, which were first applied in the Barclays PLC Annual Report 2020, have been made to the classification of cash collateral reported within cash and cash equivalents and to the presentation of items within net cash flows from operating and investing activities. Footnotes 2 and 3 below quantify the impact of the changes to the respective cash flow categories in H120 and provide further detail.

Segmental reporting - Split of

Segmental reporting - Split of income by geographic region (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of operating segments [line items]
Total income	£ 11,315	£ 11,621
United Kingdom
Disclosure of operating segments [line items]
Total income	5,895	5,989
Europe
Disclosure of operating segments [line items]
Total income	1,222	1,199
Americas
Disclosure of operating segments [line items]
Total income	3,608	3,776
Africa and Middle East
Disclosure of operating segments [line items]
Total income	20	20
Asia
Disclosure of operating segments [line items]
Total income	£ 570	£ 637

Net fee and commission income_2

Net fee and commission income (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	£ 4,620	£ 4,339
Other non-contract fee income	62	60
Fee and commission income	4,682	4,399
Fee and commission expense	(976)	(1,090)
Net fee and commission income	3,706	3,309
Transactional
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	1,589	1,543
Advisory
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	543	386
Brokerage and execution
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	662	787
Underwriting and syndication
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	1,715	1,468
Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	111	155
Operating segments | Barclays UK
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	635	605
Other non-contract fee income	0	0
Fee and commission income	635	605
Fee and commission expense	(108)	(148)
Net fee and commission income	527	457
Operating segments | Barclays UK | Transactional
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	408	386
Operating segments | Barclays UK | Advisory
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	83	79
Operating segments | Barclays UK | Brokerage and execution
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	109	102
Operating segments | Barclays UK | Underwriting and syndication
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	0	0
Operating segments | Barclays UK | Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	35	38
Operating segments | Barclays International
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	3,981	3,731
Other non-contract fee income	62	60
Fee and commission income	4,043	3,791
Fee and commission expense	(861)	(940)
Net fee and commission income	3,182	2,851
Operating segments | Barclays International | Transactional
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	1,181	1,157
Operating segments | Barclays International | Advisory
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	459	306
Operating segments | Barclays International | Brokerage and execution
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	553	685
Operating segments | Barclays International | Underwriting and syndication
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	1,715	1,468
Operating segments | Barclays International | Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	73	115
Head Office
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	4	3
Other non-contract fee income	0	0
Fee and commission income	4	3
Fee and commission expense	(7)	(2)
Net fee and commission income	(3)	1
Head Office | Transactional
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	0	0
Head Office | Advisory
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	1	1
Head Office | Brokerage and execution
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	0	0
Head Office | Underwriting and syndication
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	0	0
Head Office | Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total revenue from contracts with customers	£ 3	£ 2

Staff costs (Details)

Staff costs (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Compensation costs
Upfront bonus charge	£ 824	£ 476
Deferred bonus charge	262	269
Other incentives	6	4
Performance costs	1,092	749
Salaries	2,117	2,153
Social security costs	336	317
Post-retirement benefits	275	268
Other compensation costs	223	254
Total compensation costs	4,043	3,741
Other resourcing costs
Outsourcing	171	175
Redundancy and restructuring	23	39
Temporary staff costs	55	58
Other	42	40
Total other resourcing costs	291	312
Total staff costs	£ 4,334	£ 4,053
Barclays Group compensation costs as a % of total income	35.70%	32.20%
Share-based payment arrangements | Fair value | Forward contract [member]
Other resourcing costs
Financial instruments designated as hedging instruments, at fair value	£ 158

Infrastructure, administratio_3

Infrastructure, administration and general expenses (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Infrastructure costs
Property and equipment	£ 709	£ 757
Depreciation and amortisation	832	751
Lease payments	20	26
Impairment of property, equipment and intangible assets	304	32
Total infrastructure costs	1,865	1,566
Administration and general expenses
Consultancy, legal and professional fees	262	270
Marketing and advertising	163	158
Other administration and general expenses	508	516
Total administration and general expenses	933	944
Total infrastructure, administration and general expenses	£ 2,798	£ 2,510

Tax (Narrative) (Details)

Tax (Narrative) (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax charge	£ 759	£ 113
Effective tax rate	15.20%	8.90%
Tax expense income excluding effect of tax rate change	£ 1,151
Average effective tax rate excluding effect of tax rate change	23.10%
AT1 Securities
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax charge	£ (104)	£ (112)
UK
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Applicable tax rate	19.00%
Increase (decrease) relating to tax rate changes or imposition of new taxes, deferred tax liability (asset)	£ (223)
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes	392
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes, other comprehensive income	£ 169

Tax - Deferred tax assets and l

Tax - Deferred tax assets and liabilities (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	£ 3,771	£ 3,444
Deferred tax liabilities	(8)	(15)
Temporary differences
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	2,972	2,709
Tax losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	799	735
USA
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	1,908	2,049
UK
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	1,380	886
Other territories
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	£ 483	£ 509

Non-controlling interests (Deta

Non-controlling interests (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Profit attributable to non-controlling interests	£ 19	£ 37
Equity attributable to non-controlling interests	1,064		£ 1,085
Other non-controlling interests
Profit attributable to non-controlling interests	3	0
Equity attributable to non-controlling interests	2		23
Barclays Bank PLC | - Preference shares
Profit attributable to non-controlling interests	13	28
Equity attributable to non-controlling interests	529		529
Barclays Bank PLC | - Upper T2 instruments
Profit attributable to non-controlling interests	3	£ 9
Equity attributable to non-controlling interests	£ 533		£ 533

Earnings per share (Details)

Earnings per share (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings per share [abstract]
Profit attributable to ordinary equity holders of the parent	£ 3,812	£ 695
Basic weighted average number of shares in issue (in shares)	17,140	17,294
Number of potential ordinary shares (in shares)	467	319
Diluted weighted average number of shares (in shares)	17,607	17,613
Basic earnings per ordinary share (in GBP per share)	£ 0.222	£ 0.040
Diluted earnings per ordinary share (in GBP per share)	£ 0.217	£ 0.039

Dividends on ordinary shares (D

Dividends on ordinary shares (Details) - GBP (£) £ / shares in Units, £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Dividends on ordinary shares [Abstract]
Dividends paid, ordinary shares per share (in GBP per share)	£ 0.010	£ 0
Dividends paid, ordinary shares	£ 173	£ 0

Dividends on ordinary shares (N

Dividends on ordinary shares (Narrative) (Details) - GBP (£) £ / shares in Units, £ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Disclosure of classes of share capital [line items]
Repurchase of shares		£ (700)
Share buyback | Maximum
Disclosure of classes of share capital [line items]
Repurchase of shares	£ 500
Ordinary share capital
Disclosure of classes of share capital [line items]
Interim dividends, per share		£ 0.020	£ 0
Number of shares comprising, one american depository share		4
Repurchase of shares		£ (94)
Qualifying American Despository Shares
Disclosure of classes of share capital [line items]
Interim dividends, per share		£ 0.080

Derivative financial instrume_3

Derivative financial instruments - Total recognised derivative assets/(liabilities) (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Derivative assets	£ 256,636	£ 302,446
Derivative liabilities	(247,034)	(300,775)
Derivatives
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	46,203,824	43,359,755
Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative assets	256,636	302,446
Derivative liabilities	(247,034)	(300,775)
Derivatives in hedge accounting relationships
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	200,752	189,784
Derivatives in hedge accounting relationships | Derivatives designated as cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	91,278	74,437
Derivatives in hedge accounting relationships | Derivatives designated as fair value hedges
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	107,879	114,556
Derivatives in hedge accounting relationships | Derivatives designated as hedges of net investments
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	1,595	791
Derivatives in hedge accounting relationships | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative assets designated in hedge accounting relationships	940	566
Derivative liabilities designated in hedge accounting relationships	(1,000)	(980)
Derivatives in hedge accounting relationships | Fair value | Derivatives designated as cash flow hedges
Disclosure of detailed information about financial instruments [line items]
Derivative assets designated in hedge accounting relationships	806	386
Derivative liabilities designated in hedge accounting relationships	0	0
Derivatives in hedge accounting relationships | Fair value | Derivatives designated as fair value hedges
Disclosure of detailed information about financial instruments [line items]
Derivative assets designated in hedge accounting relationships	128	155
Derivative liabilities designated in hedge accounting relationships	(993)	(980)
Derivatives in hedge accounting relationships | Fair value | Derivatives designated as hedges of net investments
Disclosure of detailed information about financial instruments [line items]
Derivative assets designated in hedge accounting relationships	6	25
Derivative liabilities designated in hedge accounting relationships	(7)	0
Held for trading
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	46,003,072	43,169,971
Held for trading | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets held for trading	255,696	301,880
Derivative financial liabilities held for trading	246,034	299,795
Held for trading | Foreign exchange derivatives
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	5,654,026	5,554,037
Held for trading | Foreign exchange derivatives | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets held for trading	66,963	84,739
Derivative financial liabilities held for trading	64,194	84,381
Held for trading | Interest rate derivatives
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	37,888,009	35,257,371
Held for trading | Interest rate derivatives | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets held for trading	134,734	172,144
Derivative financial liabilities held for trading	123,436	162,402
Held for trading | Credit derivatives
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	920,030	847,845
Held for trading | Credit derivatives | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets held for trading	5,469	4,605
Derivative financial liabilities held for trading	5,960	5,004
Held for trading | Equity and stock index and commodity derivatives
Disclosure of detailed information about financial instruments [line items]
Contract notional amount	1,541,007	1,510,718
Held for trading | Equity and stock index and commodity derivatives | Fair value
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets held for trading	48,530	40,392
Derivative financial liabilities held for trading	£ 52,444	£ 48,008

Derivative financial instrume_4

Derivative financial instruments, narrative (Details) - GBP (£) £ in Billions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative financial liabilities
Disclosure of offsetting of financial assets [line items]
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	£ 31	£ 42
Derivative liability expsoures	225	276
Non-cash assets pledged as collateral	3	4
Cash collateral netted | Derivative financial liabilities
Disclosure of offsetting of financial assets [line items]
Gross financial assets set off against financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements	5	7
Derivative liability expsoures	31	43
Derivative financial assets
Disclosure of offsetting of financial assets [line items]
IFRS netting posted against derivative assets	33	44
Derivative asset exposures	230	276
Non-cash collateral	5	5
Derivative financial assets | Cash collateral netted
Disclosure of offsetting of financial assets [line items]
IFRS netting posted against derivative assets	4	5
Derivative asset exposures	£ 36	£ 43

Fair value of financial instr_3

Fair value of financial instruments - Assets and liabilities held at fair value disaggregated by valuation technique (fair value hierarchy) and balance sheet classification (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Trading portfolio assets	£ 147,239	£ 127,950
Financial assets at fair value through the income statement	194,421	175,151
Derivative financial instruments	256,636	302,446
Financial assets at fair value through other comprehensive income	73,260	78,688
Trading portfolio liabilities	(56,986)	(47,405)
Financial liabilities designated at fair value	(264,164)	(249,765)
Derivative financial instruments	(247,034)	(300,775)
Fair value
Disclosure of detailed information about financial instruments [line items]
Trading portfolio assets	147,239	127,950
Financial assets at fair value through the income statement	194,421	175,151
Derivative financial instruments	256,636	302,446
Financial assets at fair value through other comprehensive income	73,260	78,688
Investment property	8	10
Total assets	671,564	684,245
Trading portfolio liabilities	(56,986)	(47,405)
Financial liabilities designated at fair value	(264,164)	(249,765)
Derivative financial instruments	(247,034)	(300,775)
Total liabilities	(568,184)	(597,945)
(Level 1) | Fair value
Disclosure of detailed information about financial instruments [line items]
Trading portfolio assets	73,405	60,671
Financial assets at fair value through the income statement	1,229	4,503
Derivative financial instruments	11,643	9,155
Financial assets at fair value through other comprehensive income	21,375	19,792
Investment property	0	0
Total assets	107,652	94,121
Trading portfolio liabilities	(30,911)	(24,391)
Financial liabilities designated at fair value	(142)	(159)
Derivative financial instruments	(11,227)	(8,762)
Total liabilities	(42,280)	(33,312)
(Level 2) | Fair value
Disclosure of detailed information about financial instruments [line items]
Trading portfolio assets	71,282	65,416
Financial assets at fair value through the income statement	185,415	162,142
Derivative financial instruments	241,336	288,822
Financial assets at fair value through other comprehensive income	51,837	58,743
Investment property	0	0
Total assets	549,870	575,123
Trading portfolio liabilities	(26,058)	(22,986)
Financial liabilities designated at fair value	(263,710)	(249,251)
Derivative financial instruments	(230,207)	(285,774)
Total liabilities	(519,975)	(558,011)
(Level 3)
Disclosure of detailed information about financial instruments [line items]
Total assets	14,042	15,001
Total liabilities	(5,929)	(6,622)
(Level 3) | Fair value
Disclosure of detailed information about financial instruments [line items]
Trading portfolio assets	2,552	1,863
Financial assets at fair value through the income statement	7,777	8,506
Derivative financial instruments	3,657	4,469
Financial assets at fair value through other comprehensive income	48	153
Investment property	8	10
Total assets	14,042	15,001
Trading portfolio liabilities	(17)	(28)
Financial liabilities designated at fair value	(312)	(355)
Derivative financial instruments	(5,600)	(6,239)
Total liabilities	£ (5,929)	£ (6,622)

Fair value of financial instr_4

Fair value of financial instruments - Level 3 assets and liabilities held at fair value disaggregated by product type (Details) - (Level 3) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	£ 14,042	£ 15,001
Financial liabilities, at fair value	(5,929)	(6,622)
Asset backed securities
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	562	767
Financial liabilities, at fair value	0	(24)
Corporate debt
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	981	698
Financial liabilities, at fair value	(38)	(3)
Reverse repurchase and repurchase agreements
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	0	0
Financial liabilities, at fair value	(161)	(174)
Non-asset backed loans
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	6,338	6,394
Financial liabilities, at fair value	0	0
Equity cash products
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	402	542
Financial liabilities, at fair value	0	0
Private equity investments
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	979	873
Financial liabilities, at fair value	(16)	(14)
Other
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	1,123	1,258
Financial liabilities, at fair value	(114)	(168)
Interest rate derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	916	1,613
Financial liabilities, at fair value	(1,269)	(1,615)
Foreign exchange derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	151	144
Financial liabilities, at fair value	(129)	(143)
Credit derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	100	196
Financial liabilities, at fair value	(364)	(351)
Equity derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	2,490	2,498
Financial liabilities, at fair value	(3,838)	(4,112)
Commodity derivatives
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value	0	18
Financial liabilities, at fair value	£ 0	£ (18)

Fair value of financial instr_5

Fair value of financial instruments - Analysis of movements in Level 3 assets and liabilities (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Net assets (liabilities) [abstract]
Derivative financial assets	£ 256,636		£ 302,446
Derivative financial liabilities	247,034		£ 300,775
(Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	15,001
Ending balance, financial assets	14,042
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(6,622)
Ending balance, financial liabilities	(5,929)
Recurring fair value measurement | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	8,379	£ 10,010
Purchases, fair value measurement, assets (liabilities) net	3,904	4,594
Sales, fair value measurement, assets (liabilities) net	(3,407)	(3,252)
Issues, fair value measurement, assets (liabilities) net	0	(3)
Settlements, fair value measurement, assets (liabilities) net	(845)	(1,028)
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	2	(4)
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	459	507
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	101	(432)
Ending balance, assets (liabilities)	8,113	10,934
Derivative financial assets	3,657	7,748
Derivative financial liabilities	5,600	8,932
Recurring fair value measurement | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(591)	548
Recurring fair value measurement | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	111	(6)
Recurring fair value measurement | Investment property | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	10	13
Purchases, fair value measurement, assets	0	0
Sales, fair value measurement, assets	(2)	(1)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	0
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	0	2
Transfers out of Level 3 of fair value hierarchy, assets	0	(2)
Ending balance, financial assets	8	10
Recurring fair value measurement | Investment property | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Recurring fair value measurement | Investment property | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	(2)
Recurring fair value measurement | Net derivative financial instruments | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	(1,770)	(834)
Purchases, fair value measurement, assets (liabilities) net	(423)	(688)
Sales, fair value measurement, assets (liabilities) net	1	10
Issues, fair value measurement, assets (liabilities) net	0	0
Settlements, fair value measurement, assets (liabilities) net	54	(361)
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	53	302
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	476	(33)
Ending balance, assets (liabilities)	(1,943)	(1,184)
Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(336)	418
Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	2	2
Trading portfolio liabilities | Recurring fair value measurement | (Level 3)
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(28)	0
Purchases, fair value measurement, liabilities	(3)	0
Sales, fair value measurement, liabilities	14	0
Issues, fair value measurement, liabilities	0	0
Settlements, fair value measurement, liabilities	0	0
Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities	0	0
Transfers into Level 3 of fair value hierarchy, liabilities	0	0
Transfers out of Level 3 of fair value hierarchy, liabilities	7	0
Ending balance, financial liabilities	(17)	0
Trading portfolio liabilities | Recurring fair value measurement | (Level 3) | Financial liabilities at fair value through profit or loss, category trading
Categories of financial liabilities [abstract]
Total gains and losses in the period recognised in the income statement, liabilities	(7)	0
Trading portfolio liabilities | Recurring fair value measurement | (Level 3) | Financial liabilities at fair value through profit or loss, category other income
Categories of financial liabilities [abstract]
Total gains and losses in the period recognised in the income statement, liabilities	0	0
Financial liabilities designated at fair value | Recurring fair value measurement | (Level 3)
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(355)	(362)
Purchases, fair value measurement, liabilities	0	0
Sales, fair value measurement, liabilities	0	1
Issues, fair value measurement, liabilities	0	(3)
Settlements, fair value measurement, liabilities	98	0
Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities	0	0
Transfers into Level 3 of fair value hierarchy, liabilities	(78)	(22)
Transfers out of Level 3 of fair value hierarchy, liabilities	18	25
Ending balance, financial liabilities	(312)	(369)
Financial liabilities designated at fair value | Recurring fair value measurement | (Level 3) | Financial liabilities at fair value through profit or loss, category trading
Categories of financial liabilities [abstract]
Total gains and losses in the period recognised in the income statement, liabilities	7	(10)
Financial liabilities designated at fair value | Recurring fair value measurement | (Level 3) | Financial liabilities at fair value through profit or loss, category other income
Categories of financial liabilities [abstract]
Total gains and losses in the period recognised in the income statement, liabilities	(2)	2
Asset backed securities | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	767
Ending balance, financial assets	562
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(24)
Ending balance, financial liabilities	0
Interest rate derivatives | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	1,613
Ending balance, financial assets	916
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(1,615)
Ending balance, financial liabilities	(1,269)
Interest rate derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	(2)	(206)
Purchases, fair value measurement, assets (liabilities) net	9	18
Sales, fair value measurement, assets (liabilities) net	0	0
Issues, fair value measurement, assets (liabilities) net	0	0
Settlements, fair value measurement, assets (liabilities) net	33	10
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	21	300
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	(297)	(10)
Ending balance, assets (liabilities)	(353)	381
Interest rate derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(121)	268
Interest rate derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	4	1
Foreign exchange derivatives | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	144
Ending balance, financial assets	151
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(143)
Ending balance, financial liabilities	(129)
Foreign exchange derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	1	(7)
Purchases, fair value measurement, assets (liabilities) net	0	0
Sales, fair value measurement, assets (liabilities) net	0	0
Issues, fair value measurement, assets (liabilities) net	0	0
Settlements, fair value measurement, assets (liabilities) net	58	(12)
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	3	5
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	(34)	(8)
Ending balance, assets (liabilities)	22	67
Foreign exchange derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(6)	89
Foreign exchange derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Credit derivatives | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	196
Ending balance, financial assets	100
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(351)
Ending balance, financial liabilities	(364)
Credit derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	(155)	198
Purchases, fair value measurement, assets (liabilities) net	(117)	(258)
Sales, fair value measurement, assets (liabilities) net	2	11
Issues, fair value measurement, assets (liabilities) net	0	0
Settlements, fair value measurement, assets (liabilities) net	(5)	(376)
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	1	2
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	(1)	8
Ending balance, assets (liabilities)	(264)	(263)
Credit derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	12	151
Credit derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(1)	1
Equity derivatives | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	2,498
Ending balance, financial assets	2,490
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(4,112)
Ending balance, financial liabilities	(3,838)
Equity derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3)
Net assets (liabilities) [abstract]
Beginning balance, assets (liabilities)	(1,614)	(819)
Purchases, fair value measurement, assets (liabilities) net	(315)	(448)
Sales, fair value measurement, assets (liabilities) net	(1)	(1)
Issues, fair value measurement, assets (liabilities) net	0	0
Settlements, fair value measurement, assets (liabilities) net	(32)	17
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	0	0
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net	28	(5)
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net	808	(23)
Ending balance, assets (liabilities)	(1,348)	(1,369)
Equity derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(221)	(90)
Equity derivatives | Recurring fair value measurement | Net derivative financial instruments | (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income
Net assets (liabilities) [abstract]
Gains (losses) recognised in profit or loss, fair value measurement, assets (liabilities) net	(1)	0
Corporate debt | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	698
Ending balance, financial assets	981
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(3)
Ending balance, financial liabilities	(38)
Non-asset backed loans | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	6,394
Ending balance, financial assets	6,338
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	0
Ending balance, financial liabilities	0
Equity cash products | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	542
Ending balance, financial assets	402
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	0
Ending balance, financial liabilities	0
Private equity investments | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	873
Ending balance, financial assets	979
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(14)
Ending balance, financial liabilities	(16)
Other | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	1,258
Ending balance, financial assets	1,123
Categories of financial liabilities [abstract]
Beginning balance, financial liabilities	(168)
Ending balance, financial liabilities	(114)
Trading portfolio assets | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	1,863	2,264
Purchases, fair value measurement, assets	1,071	2,250
Sales, fair value measurement, assets	(529)	(968)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(135)	(80)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	398	178
Transfers out of Level 3 of fair value hierarchy, assets	(175)	(352)
Ending balance, financial assets	2,552	3,078
Trading portfolio assets | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	59	(214)
Trading portfolio assets | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Trading portfolio assets | Asset backed securities | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	686	656
Purchases, fair value measurement, assets	112	249
Sales, fair value measurement, assets	(294)	(224)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	(76)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	43	41
Transfers out of Level 3 of fair value hierarchy, assets	(48)	(11)
Ending balance, financial assets	489	623
Trading portfolio assets | Asset backed securities | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(10)	(12)
Trading portfolio assets | Asset backed securities | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Trading portfolio assets | Corporate debt | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	151	120
Purchases, fair value measurement, assets	305	25
Sales, fair value measurement, assets	(87)	0
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	0
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	40	4
Transfers out of Level 3 of fair value hierarchy, assets	(11)	(17)
Ending balance, financial assets	423	106
Trading portfolio assets | Corporate debt | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	25	(26)
Trading portfolio assets | Corporate debt | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Trading portfolio assets | Non-asset backed loans | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	709	974
Purchases, fair value measurement, assets	620	1,926
Sales, fair value measurement, assets	(131)	(740)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(84)	(4)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	124	97
Transfers out of Level 3 of fair value hierarchy, assets	(106)	(320)
Ending balance, financial assets	1,145	1,822
Trading portfolio assets | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	13	(111)
Trading portfolio assets | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Trading portfolio assets | Equity cash products | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	214	392
Purchases, fair value measurement, assets	13	2
Sales, fair value measurement, assets	(17)	(4)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	0
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	29	28
Transfers out of Level 3 of fair value hierarchy, assets	(9)	(4)
Ending balance, financial assets	262	347
Trading portfolio assets | Equity cash products | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	32	(67)
Trading portfolio assets | Equity cash products | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Trading portfolio assets | Other | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	103	122
Purchases, fair value measurement, assets	21	48
Sales, fair value measurement, assets	0	0
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(51)	0
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	162	8
Transfers out of Level 3 of fair value hierarchy, assets	(1)	0
Ending balance, financial assets	233	180
Trading portfolio assets | Other | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(1)	2
Trading portfolio assets | Other | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Financial assets at fair value through the income statement | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	8,506	8,500
Purchases, fair value measurement, assets	3,255	2,953
Sales, fair value measurement, assets	(2,891)	(2,293)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(857)	(430)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	86	47
Transfers out of Level 3 of fair value hierarchy, assets	(119)	(70)
Ending balance, financial assets	7,777	9,052
Financial assets at fair value through the income statement | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(314)	353
Financial assets at fair value through the income statement | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	111	(8)
Financial assets at fair value through the income statement | Non-asset backed loans | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	5,580	5,494
Purchases, fair value measurement, assets	698	1,050
Sales, fair value measurement, assets	(299)	(270)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(687)	(410)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	69	0
Transfers out of Level 3 of fair value hierarchy, assets	(48)	(58)
Ending balance, financial assets	5,194	6,187
Financial assets at fair value through the income statement | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(119)	381
Financial assets at fair value through the income statement | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Financial assets at fair value through the income statement | Equity cash products | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	326	835
Purchases, fair value measurement, assets	160	14
Sales, fair value measurement, assets	(194)	0
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	0
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	1	0
Transfers out of Level 3 of fair value hierarchy, assets	0	0
Ending balance, financial assets	140	799
Financial assets at fair value through the income statement | Equity cash products | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(171)	(22)
Financial assets at fair value through the income statement | Equity cash products | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	18	(28)
Financial assets at fair value through the income statement | Private equity investments | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	874	900
Purchases, fair value measurement, assets	106	19
Sales, fair value measurement, assets	(9)	(6)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(8)	(2)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	0	23
Transfers out of Level 3 of fair value hierarchy, assets	(71)	(12)
Ending balance, financial assets	979	880
Financial assets at fair value through the income statement | Private equity investments | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(5)	2
Financial assets at fair value through the income statement | Private equity investments | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	92	(44)
Financial assets at fair value through the income statement | Other | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	1,726	1,271
Purchases, fair value measurement, assets	2,291	1,870
Sales, fair value measurement, assets	(2,389)	(2,017)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(162)	(18)
Total gains or losses recognised in OCI, assets	0	0
Transfers into Level 3 of fair value hierarchy, assets	16	24
Transfers out of Level 3 of fair value hierarchy, assets	0	0
Ending balance, financial assets	1,464	1,186
Financial assets at fair value through the income statement | Other | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	(19)	(8)
Financial assets at fair value through the income statement | Other | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	1	64
Assets at fair value through other comprehensive income | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	153	429
Purchases, fair value measurement, assets	4	79
Sales, fair value measurement, assets	0	(1)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(5)	(157)
Total gains or losses recognised in OCI, assets	2	(4)
Transfers into Level 3 of fair value hierarchy, assets	0	0
Transfers out of Level 3 of fair value hierarchy, assets	(106)	0
Ending balance, financial assets	48	347
Assets at fair value through other comprehensive income | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	1
Assets at fair value through other comprehensive income | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Assets at fair value through other comprehensive income | Asset backed securities | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	47	86
Purchases, fair value measurement, assets	4	0
Sales, fair value measurement, assets	0	(1)
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	(5)	0
Total gains or losses recognised in OCI, assets	2	(1)
Transfers into Level 3 of fair value hierarchy, assets	0	0
Transfers out of Level 3 of fair value hierarchy, assets	0	0
Ending balance, financial assets	48	85
Assets at fair value through other comprehensive income | Asset backed securities | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	1
Assets at fair value through other comprehensive income | Asset backed securities | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Assets at fair value through other comprehensive income | Non-asset backed loans | Recurring fair value measurement | (Level 3)
Categories of financial assets [abstract]
Beginning balance, financial assets	106	343
Purchases, fair value measurement, assets	0	79
Sales, fair value measurement, assets	0	0
Issues, fair value measurement, assets	0	0
Settlements, fair value measurement, assets	0	(157)
Total gains or losses recognised in OCI, assets	0	(3)
Transfers into Level 3 of fair value hierarchy, assets	0	0
Transfers out of Level 3 of fair value hierarchy, assets	(106)	0
Ending balance, financial assets	0	262
Assets at fair value through other comprehensive income | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category trading
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	0	0
Assets at fair value through other comprehensive income | Non-asset backed loans | Recurring fair value measurement | (Level 3) | Financial assets at fair value through profit or loss, category other income
Categories of financial assets [abstract]
Total gains and losses in the period recognised in the income statement, assets	£ 0	£ 0

Fair value of financial instr_6

Fair value of financial instruments - Unrealised gains and losses recognised in the period on Level 3 assets and liabilities held at period end (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of detailed information about financial instruments [line items]
Trading income	£ 3,482	£ 4,198
Other income	72	27
Other compre hensive income	(1,600)	2,889
(Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	(532)	452
Other income	114	(56)
Other compre hensive income	0	(2)
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	(418)	394
(Level 3) | Non-current assets/liabilities held for sale
Disclosure of detailed information about financial instruments [line items]
Trading income	0	0
Other income	0	0
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	0	0
(Level 3) | Investment properties
Disclosure of detailed information about financial instruments [line items]
Trading income	0	0
Other income	0	(2)
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	0	(2)
(Level 3) | Net derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Trading income	(367)	248
Other income	0	0
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	(367)	248
Trading portfolio liabilities | (Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	(6)	0
Other income	0	0
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	(6)	0
Financial liabilities designated at fair value | (Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	7	(16)
Other income	0	(1)
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	7	(17)
Trading portfolio assets | (Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	35	(177)
Other income	0	0
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	35	(177)
Financial assets at fair value through the income statement | (Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	(201)	397
Other income	114	(53)
Other compre hensive income	0	0
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	(87)	344
Assets at fair value through other comprehensive income | (Level 3)
Disclosure of detailed information about financial instruments [line items]
Trading income	0	0
Other income	0	0
Other compre hensive income	0	(2)
Total unrealised gains and losses recognised during the period on Level 3 assets and liabilities held at period end	£ 0	£ (2)

Fair value of financial instr_7

Fair value of financial instruments - Sensitivity analysis of valuations using unobservable inputs (Details) - (Level 3) - Recurring fair value measurement - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	£ 893	£ 903
Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	3
Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(993)	(1,171)
Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	(3)
Corporate debt | Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	22	16
Corporate debt | Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Corporate debt | Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(16)	(14)
Corporate debt | Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Non-asset backed loans | Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	202	190
Non-asset backed loans | Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	3
Non-asset backed loans | Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(310)	(409)
Non-asset backed loans | Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	(3)
Equity cash products | Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	130	158
Equity cash products | Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Equity cash products | Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(119)	(141)
Equity cash products | Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Private equity investments | Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	223	199
Private equity investments | Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Private equity investments | Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(198)	(227)
Private equity investments | Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Other | Favourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	18	21
Other | Favourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Other | Unfavourable changes | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(18)	(21)
Other | Unfavourable changes | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Interest rate derivatives | Favourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	52	82
Interest rate derivatives | Favourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Interest rate derivatives | Unfavourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(83)	(123)
Interest rate derivatives | Unfavourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Foreign exchange derivatives | Favourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	6	6
Foreign exchange derivatives | Favourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Foreign exchange derivatives | Unfavourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(10)	(11)
Foreign exchange derivatives | Unfavourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Credit derivatives | Favourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	53	55
Credit derivatives | Favourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Credit derivatives | Unfavourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(44)	(44)
Credit derivatives | Unfavourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Equity derivatives | Favourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	185	174
Equity derivatives | Favourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Equity derivatives | Unfavourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(193)	(179)
Equity derivatives | Unfavourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Commodity derivatives | Favourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	2	2
Commodity derivatives | Favourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	0	0
Commodity derivatives | Unfavourable changes | Derivatives | Income statement
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	(2)	(2)
Commodity derivatives | Unfavourable changes | Derivatives | Equity
Disclosure of detailed information about financial instruments [line items]
Sensitivity analysis valuation due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions	£ 0	£ 0

Fair value of financial instr_8

Fair value of financial instruments - Narrative (Details) - GBP (£) £ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Deposits at amortised cost	£ 500,895	£ 481,036
Brokered certificates of deposit
Disclosure of detailed information about financial instruments [line items]
Deposits at amortised cost	1,241	1,494
(Level 3) | Recurring fair value measurement | Favourable changes
Disclosure of detailed information about financial instruments [line items]
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets (liabilities)	893	906
(Level 3) | Recurring fair value measurement | Unfavourable changes
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets (liabilities)	993	1,174
Exit price adjustments derived from market bid-offer spreads
Disclosure of detailed information about financial instruments [line items]
(Increase) decrease in fair value adjustments of derivatives	7
Fair value adjustments	(500)	(493)
Uncollateralised derivative funding
Disclosure of detailed information about financial instruments [line items]
(Increase) decrease in fair value adjustments of derivatives	35
Fair value adjustments	(80)	(115)
Derivative credit valuation adjustments
Disclosure of detailed information about financial instruments [line items]
(Increase) decrease in fair value adjustments of derivatives	58
Fair value adjustments	(210)	(268)
Derivative debit valuation adjustments
Disclosure of detailed information about financial instruments [line items]
(Increase) decrease in fair value adjustments of derivatives	22
Fair value adjustments	91	113
Financial instruments at fair value, category | (Level 3) | Recurring fair value measurement
Disclosure of detailed information about financial instruments [line items]
Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	126	116
Additions, aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	32	27
Amortisation and releases, aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	22	24
Financial instruments at amortised cost, category | (Level 3) | Recurring fair value measurement
Disclosure of detailed information about financial instruments [line items]
Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	240	247
Additions, aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	0	6
Amortisation and releases, aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss	£ 7	£ 14

Fair value of financial instr_9

Fair value of financial instruments - Fair value adjustments (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Exit price adjustments derived from market bid-offer spreads
Disclosure of detailed information about financial instruments [line items]
Fair value adjustments	£ (500)	£ (493)
Uncollateralised derivative funding
Disclosure of detailed information about financial instruments [line items]
Fair value adjustments	(80)	(115)
Derivative credit valuation adjustments
Disclosure of detailed information about financial instruments [line items]
Fair value adjustments	(210)	(268)
Derivative debit valuation adjustments
Disclosure of detailed information about financial instruments [line items]
Fair value adjustments	£ 91	£ 113

Fair value of financial inst_10

Fair value of financial instruments - Comparison of carrying amounts and fair values for assets and liabilities not held at fair value (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Categories of financial assets [abstract]
Loans and advances at amortised cost	£ 348,549	£ 342,632
Reverse repurchase agreements and other similar secured lending	4,459	9,031
Categories of financial liabilities [abstract]
Deposits at amortised cost	(500,895)	(481,036)
Repurchase agreements and other similar secured borrowing	(20,005)	(14,174)
Debt securities in issue	(90,733)	(75,796)
Subordinated liabilities	(12,839)	(16,341)	£ (18,156)
Fair value
Categories of financial assets [abstract]
Loans and advances at amortised cost	347,733	340,516
Reverse repurchase agreements and other similar secured lending	4,459	9,031
Categories of financial liabilities [abstract]
Deposits at amortised cost	(500,933)	(481,106)
Repurchase agreements and other similar secured borrowing	(20,005)	(14,174)
Debt securities in issue	(92,746)	(77,813)
Subordinated liabilities	(13,434)	(16,918)
Carrying amount
Categories of financial assets [abstract]
Loans and advances at amortised cost	348,549	342,632
Reverse repurchase agreements and other similar secured lending	4,459	9,031
Categories of financial liabilities [abstract]
Deposits at amortised cost	(500,895)	(481,036)
Repurchase agreements and other similar secured borrowing	(20,005)	(14,174)
Debt securities in issue	(90,733)	(75,796)
Subordinated liabilities	£ (12,839)	£ (16,341)

Loans and advances and deposi_3

Loans and advances and deposits at amortised cost (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Deposits
Disclosure of detailed information about financial instruments [line items]
Total deposits at amortised cost	£ 500,895	£ 481,036
Banks | Deposits
Disclosure of detailed information about financial instruments [line items]
Total deposits at amortised cost	17,165	17,343
Customers | Deposits
Disclosure of detailed information about financial instruments [line items]
Total deposits at amortised cost	483,730	463,693
Total loans and advances at amortised cost
Disclosure of detailed information about financial instruments [line items]
Total loans and advances at amortised cost	348,549	342,632
Total loans and advances at amortised cost | Banks
Disclosure of detailed information about financial instruments [line items]
Total loans and advances at amortised cost	11,032	8,900
Total loans and advances at amortised cost | Customers
Disclosure of detailed information about financial instruments [line items]
Total loans and advances at amortised cost	309,194	309,927
Debt securities at amortised cost
Disclosure of detailed information about financial instruments [line items]
Total loans and advances at amortised cost	£ 28,323	£ 23,805

Goodwill and intangible asset_2

Goodwill and intangible assets (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Goodwill	£ 3,888	£ 3,891
Intangibles	4,308	4,057
Goodwill and intangible assets	8,196	7,948
Head Office
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Goodwill	42	42
Intangibles	3	4
Goodwill and intangible assets	45	46
Barclays UK
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Goodwill	3,560	3,560
Intangibles	1,570	1,618
Goodwill and intangible assets	5,130	5,178
Barclays International
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Goodwill	286	289
Intangibles	2,735	2,435
Goodwill and intangible assets	£ 3,021	£ 2,724

Subordinated liabilities (Detai

Subordinated liabilities (Details) - GBP (£) £ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Subordinated liabilities [abstract]
Opening balance as at 1 January	£ 16,341	£ 18,156
Issuances	1,734	1,438
Redemptions	(4,534)	(3,464)
Other	(702)	211
Closing balance	£ 12,839	£ 16,341

Subordinated liabilities - Narr

Subordinated liabilities - Narrative (Details) € in Millions, £ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2021GBP (£)	Jun. 30, 2021EUR (€)	Dec. 31, 2020GBP (£)	Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]
Issuances	£ 1,734		£ 1,438
Redemption of subordinated debt	4,534		£ 3,464
ZAR Notes | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Issuances	82
USD Notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Redemption of subordinated debt	73
USD Notes | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Issuances	£ 73
10% GBP Notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	10.00%	10.00%
Redemption of subordinated debt	£ 1,961
6% EUR Notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	6.00%	6.00%
Redemption of subordinated debt	£ 1,339
10.179% USD Notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate				10.179%
Redemption of subordinated debt	1,075
EUR Notes | Floating interest rate
Disclosure of detailed information about borrowings [line items]
Redemption of subordinated debt	£ 86
Barclays PLC | 1.125% Resetting callable notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Issuances | €		€ 855
Borrowings, interest rate	1.125%	1.125%
Barclays PLC | 3.811% Resetting callable notes | Fixed interest rate
Disclosure of detailed information about borrowings [line items]
Issuances	£ 724
Borrowings, interest rate	3.811%	3.811%

Provisions - Total Provisions (

Provisions - Total Provisions (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of other provisions [line items]
Provisions	£ 1,772	£ 2,304
Customer redress
Disclosure of other provisions [line items]
Provisions	449	497
Legal, competition and regulatory matters
Disclosure of other provisions [line items]
Provisions	223	268
Redundancy and restructuring
Disclosure of other provisions [line items]
Provisions	88	158
Undrawn contractually committed facilities and guarantees
Disclosure of other provisions [line items]
Provisions	713	1,064
Onerous contracts
Disclosure of other provisions [line items]
Provisions	14	28
Sundry provisions
Disclosure of other provisions [line items]
Provisions	£ 285	£ 289

Retirement benefits (Narrative)

Retirement benefits (Narrative) (Details) - GBP (£) £ in Billions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan	£ (2.4)	£ (1.5)
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | Pension defined benefit plans | United Kingdom
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan	£ (2.6)	£ (1.8)

Retirement benefits - UKRF fund

Retirement benefits - UKRF funding valuations (Details) - GBP (£) £ in Millions	1 Months Ended	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2019
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan		£ (2,400)	£ (1,500)
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan		(2,600)	£ (1,800)
Employer contributions	£ 350	1,000
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | Deficit contributions 30 September 2019 valuation
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan				£ 2,300
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | Deficit contributions valuation recovery plan 2020
Disclosure of fair value of plan assets [line items]
Surplus (deficit) in plan		900
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | 2021 | Barclays Bank PLC
Disclosure of fair value of plan assets [line items]
Employer contributions		700
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | 2022 | Barclays Bank PLC
Disclosure of fair value of plan assets [line items]
Employer contributions		294
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | 2023 | Barclays Bank PLC
Disclosure of fair value of plan assets [line items]
Employer contributions		286
Pension defined benefit plans | Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control | United Kingdom | Later than one month and not later than three months
Disclosure of fair value of plan assets [line items]
Estimate of contributions expected to be paid to plan for next annual reporting period		£ 350

Called up share capital (Detail

Called up share capital (Details) - GBP (£) £ in Millions		6 Months Ended
		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Beginning Balance, equity		£ 66,882	£ 69,541	£ 65,660
Issue of shares under employee share schemes		314	(283)	629
Repurchase of shares		(700)
Ending Balance, equity		68,116	66,882	69,541
Share premium
Beginning Balance, equity		297
Issue of shares under employee share schemes		22
Ending Balance, equity		319	297
Total share capital and share premium
Beginning Balance, equity	[1]	4,637	4,620	4,594
Issue of shares under employee share schemes	[1]	25	17	26
Repurchase of shares	[1]	(94)
Ending Balance, equity	[1]	4,568	4,637	£ 4,620
Ordinary share capital
Beginning Balance, equity		4,340
Issue of shares under employee share schemes		3
Repurchase of shares		(94)
Ending Balance, equity		£ 4,249	£ 4,340
[1]	Details of share capital, other equity instruments and other reserves are shown on pages 84 to 85.

Called up share capital (Narrat

Called up share capital (Narrative) (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Repurchase of treasury shares (in shares)	377
Repurchase of shares	£ (700)
Ordinary share capital
Number of shares issued (in shares)	16,998	17,359
Par value per share (in GBP per share)	£ 0.25	£ 0.25
Repurchase of shares	£ (94)

Other equity instruments (Detai

Other equity instruments (Details) - GBP (£) £ in Millions	6 Months Ended					12 Months Ended
	Jun. 30, 2021		Dec. 31, 2020		Jun. 30, 2020	Dec. 31, 2020
Opening balance as at 1 January	£ 11,172				£ 10,871	£ 10,871
Securities held by the Group	(29)		£ (4)		£ 9
Closing balance	11,167		11,172			11,172
Other equity instruments
Issuances	0					1,142
Redemptions	0					(831)
Securities held by the Group	£ (5)	[1]	£ (10)	[1]		£ (10)
[1]	Details of share capital, other equity instruments and other reserves are shown on pages 84 to 85.

Other equity instruments (Narra

Other equity instruments (Narrative) (Details) £ in Millions		Jun. 30, 2021GBP (£)	Dec. 31, 2020GBP (£)	Jun. 30, 2020GBP (£)	Dec. 31, 2019GBP (£)
Equity		£ 68,116	£ 66,882	£ 69,541	£ 65,660
Barclays PLC
Equity		54,616	54,872
Other equity instruments
Equity	[1]	£ 11,167	£ 11,172	£ 10,871	£ 10,871
AT1 Securities | Barclays PLC
Convertible instruments, conversion ratio minimum		0.07
[1]	Details of share capital, other equity instruments and other reserves are shown on pages 84 to 85.

Other reserves (Details)

Other reserves (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of reserves within equity [line items]
Other reserves	£ 2,856	£ 4,461
Currency translation reserve
Disclosure of reserves within equity [line items]
Other reserves	2,376	2,871
Fair value through other comprehensive income reserve
Disclosure of reserves within equity [line items]
Other reserves	(245)	5
Cash flow hedging reserve
Disclosure of reserves within equity [line items]
Other reserves	664	1,575
Own credit reserve
Disclosure of reserves within equity [line items]
Other reserves	(1,001)	(954)
Other reserves and treasury shares
Disclosure of reserves within equity [line items]
Other reserves	£ 1,062	£ 964

Other reserves - Narrative (Det

Other reserves - Narrative (Details) - GBP (£) £ in Millions, shares in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Disclosure of reserves within equity [line items]
Reserves	£ (2,856)	£ (4,461)
Securities held by the Group	£ (29)	(4)	£ 9
Repurchase of treasury shares (in shares)	377
Repurchase of shares	£ (700)
Currency translation reserve
Disclosure of reserves within equity [line items]
Reserves	(2,376)	(2,871)
Movements	495
Fair value through other comprehensive income reserve | Absa Group Limited
Disclosure of reserves within equity [line items]
Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax	(325)
Fair value through other comprehensive income reserve
Disclosure of reserves within equity [line items]
Reserves	245	(5)
Movements	(250)
Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax	199
Tax	168
Reversal of impairment loss recognised in other comprehensive income	8
Fair value through other comprehensive income reserve | Loans to government
Disclosure of reserves within equity [line items]
Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax	114
Cash flow hedging reserve
Disclosure of reserves within equity [line items]
Reserves	(664)	(1,575)
Movements	911
Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax	902
Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax	287
Tax	282
Own credit reserve
Disclosure of reserves within equity [line items]
Reserves	1,001	954
Movements	47
Tax	115
Gains (losses) on change in value of foreign currency basis spreads, before tax	(266)
Securities held by the Group	100
Other reserves and treasury shares
Disclosure of reserves within equity [line items]
Reserves	(1,062)	£ (964)
Movements	94
Treasury shares
Disclosure of reserves within equity [line items]
Movements	£ 4

Contingent liabilities and co_3

Contingent liabilities and commitments (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Contingent liabilities
Disclosure of contingent liabilities [line items]
Notional amount	£ 19,198	£ 21,609
Commitments
Disclosure of contingent liabilities [line items]
Notional amount	346,298	333,049
Guarantees and letters of credit pledged as collateral security | Contingent liabilities
Disclosure of contingent liabilities [line items]
Notional amount	13,519	15,665
Performance guarantees, acceptances and endorsements | Contingent liabilities
Disclosure of contingent liabilities [line items]
Notional amount	5,679	5,944
Documentary credits and other short-term trade related transactions | Commitments
Disclosure of contingent liabilities [line items]
Notional amount	1,017	1,086
Standby facilities, credit lines and other commitments | Commitments
Disclosure of contingent liabilities [line items]
Notional amount	£ 345,281	£ 331,963

Legal, competition and regula_2

Legal, competition and regulatory matters (Narrative) (Details) € in Millions, £ in Millions, SFr in Millions, $ in Millions

1 Months Ended

3 Months Ended

5 Months Ended

6 Months Ended

12 Months Ended

Jun. 30, 2021USD ($)

Apr. 30, 2021USD ($)

Jun. 30, 2019CHF (SFr)settlement

May 31, 2019EUR (€)settlement

Mar. 31, 2019GBP (£)

May 31, 2021USD ($)

Jun. 30, 2021GBP (£)lawsuitsplaintiffsettlementdefendant

Jun. 30, 2020GBP (£)

Dec. 31, 2020USD ($)defendantpensionFund

Dec. 31, 2018USD ($)

Dec. 31, 2016lawsuits

Dec. 31, 2015USD ($)

Dec. 31, 2013GBP (£)

Dec. 31, 2012USD ($)lawsuits

Dec. 31, 2008USD ($)agreement

Dec. 31, 2007lawsuits

Aug. 31, 2020GBP (£)

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | £

£ 99

£ 30

Government and agency securities civil actions and related matters | Barclays Capital Inc

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 87

Civil actions in respect of the US Anti-Terrorism Act - EDNY

Disclosure of contingent liabilities [line items]

Number of plaintiffs | plaintiff

4,000

Number of lawsuits dismissed

3

Number of lawsuits with specified damages sought

6

Number of lawsuits subject to appeal

1

Civil actions in respect of the US Anti-Terrorism Act - SDNY

Disclosure of contingent liabilities [line items]

Number of lawsuits dismissed

1

Number of lawsuits with specified damages sought

2

HMRC assessments concerning UK VAT

Disclosure of contingent liabilities [line items]

Loss contingency, damages sought, claimed amounts, value | £

£ 181

HMRC assessments concerning UK VAT | Barclays UK

Disclosure of contingent liabilities [line items]

Loss contingency, damages sought, claimed amounts, value | £

128

US residential and commercial mortgage-related activity and litigation | Legacy RMBS purchases

Disclosure of contingent liabilities [line items]

Asset-backed debt instruments held | $

$ 22

Number of defendants | defendant

6

US residential and commercial mortgage-related activity and litigation | Legacy RMBS purchases | NEW MEXICO

Disclosure of contingent liabilities [line items]

Number of retirement benefit funds | pensionFund

2

US residential and commercial mortgage-related activity and litigation | Originated and sold to third parties by Acquired Subsidiary | RMBS repurchase requests

Disclosure of contingent liabilities [line items]

Number of lawsuits dismissed | settlement

1

Number of lawsuits with specified damages sought

2

4

Number of settlements | settlement

2

Civil Actions In Respect Of VRDO - Private Plaintiffs

Disclosure of contingent liabilities [line items]

Number of lawsuits with specified damages sought

2

Civil actions in respect of VRDO - SNDY

Disclosure of contingent liabilities [line items]

Number of lawsuits with specified damages sought

3

Number of lawsuits consolidated

2

Foreign Exchange investigations | Securities and Exchange Commission

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | SFr

SFr 27

Foreign Exchange investigations | Fines settlement

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | €

€ 210

Number of settlements | settlement

2

2

USD LIBOR Cases in MDL Court

Disclosure of contingent liabilities [line items]

Number of settlements | settlement

2

Sterling LIBOR Case in SDNY

Disclosure of contingent liabilities [line items]

Number of lawsuits with specified damages sought

2

CFS remediation of ASL loans

Disclosure of contingent liabilities [line items]

Expected reimbursement, other provisions | £

£ 37

Supranational, sovereign and agency bonds civil actions

Disclosure of contingent liabilities [line items]

Number of lawsuits dismissed

1

Non-US forex civil actions

Disclosure of contingent liabilities [line items]

Number of lawsuits with specified damages sought

2

LIBOR local authority civil action

Disclosure of contingent liabilities [line items]

Number of defendants | defendant

1

Barclays Bank PLC | Government and agency securities civil actions and related matters

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 5.7

Barclays Bank PLC | BDC Finance LLC

Disclosure of contingent liabilities [line items]

Litigation settlements approved, value | $

$ 3.3

$ 298

Barclays Bank PLC | HMRC assessments concerning UK VAT

Disclosure of contingent liabilities [line items]

Loss contingency, damages sought, claimed amounts, value | £

£ 53

Barclays Bank PLC | US residential and commercial mortgage-related activity and litigation | Originated and sold to third parties by Acquired Subsidiary | RMBS repurchase requests

Disclosure of contingent liabilities [line items]

Original unpaid principal balance at time of sale | $

$ 2,100

Barclays Bank PLC | Foreign Exchange investigations

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 2,380

Barclays Bank PLC | Consolidated FX Action | Barclays Capital Inc | Securities and Exchange Commission

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 384

Barclays Bank PLC | USD LIBOR Cases in MDL Court | Lawsuits with specified damages sought

Disclosure of contingent liabilities [line items]

Number of lawsuits with specified damages sought

3

Loss contingency, damages sought, claimed amounts, value | $

$ 100

Barclays Bank PLC | USD LIBOR Cases in MDL Court | Exchange-based class claims

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 7.5

$ 7.1

Barclays Bank PLC | USD LIBOR Cases in MDL Court | Debt securities class claims

Disclosure of contingent liabilities [line items]

Losses on litigation settlements | $

$ 20

Barclays Bank PLC | FCA Proceedings and other investigations

Disclosure of contingent liabilities [line items]

Number of advisory service agreements | agreement

2

Loss contingency, financial penalty warning | £

£ 50

Barclays PLC parent company b_3

Barclays PLC parent company balance sheet (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Assets
Loans and advances to subsidiaries	£ 348,549	£ 342,632
Financial assets at fair value through the income statement	194,421	175,151
Derivative financial instruments	256,636	302,446
Other assets	3,501	2,622
Total assets	1,376,333	1,349,514
Liabilities
Deposits at amortised cost	500,895	481,036
Cash collateral and settlement balances	101,923	85,423
Debt securities in issue	90,733	75,796
Subordinated Liabilities	12,839	16,341		£ 18,156
Financial liabilities designated at fair value	264,164	249,765
Other liabilities	10,928	8,662
Total liabilities	1,308,217	1,282,632
Equity
Other equity instruments	11,167	11,172		10,871
Other reserves	2,856	4,461
Retained earnings	48,461	45,527
Total equity	68,116	66,882	£ 69,541	£ 65,660
Total equity and liabilities	1,376,333	1,349,514
Barclays PLC
Assets
Investment in subsidiaries	58,828	58,886
Loans and advances to subsidiaries	23,295	24,710
Financial assets at fair value through the income statement	21,046	17,521
Derivative financial instruments	2	7
Other assets	19	65
Total assets	103,190	101,189
Liabilities
Deposits at amortised cost	476	482
Cash collateral and settlement balances	0	0
Debt securities in issue	26,663	28,428
Subordinated Liabilities	9,170	7,724
Financial liabilities designated at fair value	12,130	9,507
Other liabilities	135	176
Total liabilities	48,574	46,317
Equity
Called up share capital	4,249	4,340
Share premium account	319	297
Other equity instruments	11,169	11,169
Other reserves	488	394
Retained earnings	38,391	38,672
Total equity	54,616	54,872
Total equity and liabilities	£ 103,190	£ 101,189

Barclays PLC parent company b_4

Barclays PLC parent company balance sheet (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions	3 Months Ended	6 Months Ended							12 Months Ended
	Mar. 31, 2020GBP (£)	Jun. 30, 2021GBP (£)	Jun. 30, 2021EUR (€)	Jun. 30, 2021USD ($)	Jun. 30, 2021AUD ($)	Jun. 30, 2021JPY (¥)	Jun. 30, 2020GBP (£)	[1]	Dec. 31, 2020GBP (£)	Dec. 31, 2019GBP (£)
Condensed Balance Sheet Statements, Captions [Line Items]
Financial liabilities designated at fair value		£ 264,164							£ 249,765
Issuance of subordinated debt		1,734							1,438
Financial assets at fair value through the income statement		194,421							175,151
Loans and advances to subsidiaries		348,549							342,632
Repurchase of shares		700
Subordinated Liabilities		12,839							16,341	£ 18,156
Debt securities in issue		90,733							75,796
Net increase in debt securities in issue		13,041					£ 24,183
Other reserves		2,856							4,461
Barclays PLC
Condensed Balance Sheet Statements, Captions [Line Items]
Investment in subsidiaries		58,828							58,886
Financial liabilities designated at fair value		12,130							9,507
Financial assets at fair value through the income statement		21,046							17,521
Decrease in loans and advances to related parties		(1,415)
Foreign exchange gain (loss)		(500)
Loans and advances to subsidiaries		23,295							24,710
Repurchase of shares	£ 700
Subordinated Liabilities		9,170							7,724
Debt securities in issue		26,663							28,428
Net increase in debt securities in issue		(2,200)	€ (1,250)
Other reserves		488							394
Barclays PLC | Financial liabilities designated at fair value
Condensed Balance Sheet Statements, Captions [Line Items]
Financial liabilities designated at fair value		12,130							9,507
Barclays PLC | Barclays Bank PLC
Condensed Balance Sheet Statements, Captions [Line Items]
Dividends received		776
Barclays PLC | Barclays Bank PLC | AT1 Securities
Condensed Balance Sheet Statements, Captions [Line Items]
Investment in subsidiaries		10,995							£ 10,995
Barclays PLC | Subordinated Notes | Financial liabilities designated at fair value
Condensed Balance Sheet Statements, Captions [Line Items]
Issuance of subordinated debt | $				$ 750
Barclays PLC | Subordinated Notes | Barclays Bank PLC
Condensed Balance Sheet Statements, Captions [Line Items]
Issuance of bonds and notes		1,600
Barclays PLC | Subordinated Notes | Fixed interest rate
Condensed Balance Sheet Statements, Captions [Line Items]
Issuance of subordinated debt			1,000	$ 1,000
Barclays PLC | Senior Notes | Fixed interest rate | Financial liabilities designated at fair value
Condensed Balance Sheet Statements, Captions [Line Items]
Issuance of subordinated debt			€ 1,000			¥ 77,000
Barclays PLC | Senior Debt | Barclays Bank PLC
Condensed Balance Sheet Statements, Captions [Line Items]
Cash receipts from repayment of advances and loans made to related parties		£ 2,200
Barclays PLC | Senior Debt | Floating interest rate | Financial liabilities designated at fair value
Condensed Balance Sheet Statements, Captions [Line Items]
Issuance of subordinated debt | $					$ 600
[1]	H120 comparative figures have been restated to make the condensed cash flow statement more relevant following a review of the disclosure and the accounting policies applied that was undertaken in H220. Amendments, which were first applied in the Barclays PLC Annual Report 2020, have been made to the classification of cash collateral reported within cash and cash equivalents and to the presentation of items within net cash flows from operating and investing activities. Footnotes 2 and 3 below quantify the impact of the changes to the respective cash flow categories in H120 and provide further detail.

Credit Risk - Loans and advance

Credit Risk - Loans and advances at amortised cost by stage (Details) £ in Millions, $ in Billions	6 Months Ended		12 Months Ended
	Jun. 30, 2021GBP (£)	Jun. 30, 2020GBP (£)	Dec. 31, 2020GBP (£)	Dec. 31, 2020USD ($)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 692,346		£ 686,728
Coverage ratio	0.010		0.014	0.014
Loan impairment release	£ (742)	£ 3,738	£ 4,838
Loan loss rate			0.0138
Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	699,576		£ 696,127
Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(7,230)		(9,399)
Financial assets at fair value, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Exposure to credit risk on loan commitments and financial guarantee contracts	£ 21,000		£ 9,500
Stage 1
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.002		0.002	0.002
Stage 1 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 603,132		£ 580,903
Stage 1 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (1,413)		£ (1,289)
Lifetime expected credit losses | Stage 2
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.030		0.042	0.042
Lifetime expected credit losses | Stage 2 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 88,007		£ 103,897
Lifetime expected credit losses | Stage 2 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (2,669)		£ (4,322)
Lifetime expected credit losses | Stage 3
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.373		0.334	0.334
Lifetime expected credit losses | Stage 3 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 8,437		£ 11,327
Lifetime expected credit losses | Stage 3 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(3,148)		(3,788)
Total Barclays Group Wholesale
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	7,796		7,551
Head Office
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Loan impairment release	(6)	55
Barclays UK | Operating segments
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Loan impairment release	(443)	1,064
Barclays International | Operating segments
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Loan impairment release	(293)	£ 2,619
Total loans and advances at amortised cost | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 348,549		£ 342,632
Coverage ratio	0.018		0.024	0.024
Loan impairment release	£ (382)		£ 3,909
Loan loss rate			0.0111
Credit exposure			£ 5,000
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	355,066		350,967
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(6,517)		(8,335)
Total loans and advances at amortised cost | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 303,797		£ 289,931
Coverage ratio	0.004		0.004	0.004
Total loans and advances at amortised cost | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 304,982		£ 290,964
Total loans and advances at amortised cost | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(1,185)		(1,033)
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 40,078		£ 47,442
Coverage ratio	0.053		0.070	0.070
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 42,311		£ 51,006
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(2,233)		(3,564)
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 4,674		£ 5,259
Coverage ratio	0.399		0.415	0.415
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 7,773		£ 8,997
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(3,099)		(3,738)
Total loans and advances at amortised cost | Total Barclays Group retail | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 213,023		£ 207,896
Coverage ratio	0.023		0.030	0.030
Loan impairment release	£ (284)		£ 2,841
Loan loss rate			0.0133
Total loans and advances at amortised cost | Total Barclays Group retail | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	218,075		£ 214,249
Total loans and advances at amortised cost | Total Barclays Group retail | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (5,052)		£ (6,353)
Total loans and advances at amortised cost | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.005		0.004	0.004
Total loans and advances at amortised cost | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 185,876		£ 178,565
Total loans and advances at amortised cost | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (891)		£ (732)
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.069		0.096	0.096
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 26,964		£ 30,116
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (1,855)		£ (2,889)
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.440		0.491	0.491
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 5,235		£ 5,568
Total loans and advances at amortised cost | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(2,306)		(2,732)
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 135,526		£ 134,736
Coverage ratio	0.011		0.014	0.014
Loan impairment release	£ (98)		£ 1,068
Loan loss rate			0.0078
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	136,991		£ 136,718
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (1,465)		£ (1,982)
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.002		0.003	0.003
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 119,106		£ 112,399
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (294)		£ (301)
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.025		0.032	0.032
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 15,347		£ 20,890
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (378)		£ (675)
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.312		0.293	0.293
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 2,538		£ 3,429
Total loans and advances at amortised cost | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(793)		(1,006)
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 4,865		£ 5,396
Coverage ratio	0.076		0.075	0.075
Loan impairment release	£ (6)		£ 91
Loan loss rate			0.0156
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	5,265		£ 5,831
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (400)		£ (435)
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.001		0.001	0.001
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 4,003		£ 4,267
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (3)		£ (4)
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.078		0.071	0.071
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 502		£ 720
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (39)		£ (51)
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.471		0.450	0.450
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 760		£ 844
Total loans and advances at amortised cost | Head Office | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(358)		(380)
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 526		£ 572
Coverage ratio	0.056		0.051	0.051
Loan impairment release	£ 0		£ 0
Loan loss rate			0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	557		£ 603
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (31)		£ (31)
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0		0	0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 522		£ 570
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 0		£ 0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0		0	0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 3		£ 0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 0		£ 0
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.969		0.939	0.939
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 32		£ 33
Total loans and advances at amortised cost | Head Office | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(31)		(31)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 182,586		£ 176,890
Coverage ratio	0.012		0.017	0.017
Loan impairment release	£ (259)		£ 1,070
Loan loss rate			0.0059
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	184,878		£ 179,878
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (2,292)		£ (2,988)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.002		0.002	0.002
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 158,587		£ 153,250
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (313)		£ (332)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.044		0.063	0.063
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 23,576		£ 23,896
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (1,035)		£ (1,509)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.348		0.420	0.420
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 2,715		£ 2,732
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(944)		(1,147)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 38,676		£ 37,111
Coverage ratio	0.005		0.007	0.007
Loan impairment release	£ (23)		£ 154
Loan loss rate			0.0041
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	38,877		£ 37,369
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (201)		£ (258)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.002		0	0
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 36,069		£ 31,918
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (63)		£ (13)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.028		0.030	0.030
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 1,727		£ 4,325
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (49)		£ (129)
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.082		0.103	0.103
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 1,081		£ 1,126
Total loans and advances at amortised cost | Barclays UK | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(89)		(116)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 25,572		£ 25,610
Coverage ratio	0.084		0.103	0.103
Loan impairment release	£ (19)		£ 1,680
Loan loss rate			0.0589
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	27,932		£ 28,540
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (2,360)		£ (2,930)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.025		0.019	0.019
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 23,286		£ 21,048
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (575)		£ (396)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.271		0.242	0.242
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 2,886		£ 5,500
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (781)		£ (1,329)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.570		0.605	0.605
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 1,760		£ 1,992
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group retail | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(1,004)		(1,205)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 96,324		£ 97,053
Coverage ratio	0.013		0.017	0.017
Loan impairment release	£ (75)		£ 914
Loan loss rate			0.0093
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	97,557		£ 98,746
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (1,233)		£ (1,693)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.003		0.004	0.004
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 82,515		£ 79,911
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Stage 1 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (231)		£ (288)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.024		0.033	0.033
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 13,617		£ 16,565
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (329)		£ (546)
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.472		0.378	0.378
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 1,425		£ 2,270
Total loans and advances at amortised cost | Barclays International | Operating segments | Total Barclays Group Wholesale | Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(673)		(859)
Off balance sheet loan commitments and financial guarantee contracts
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 343,797		£ 344,096
Coverage ratio	0.002		0.003	0.003
Loan impairment release	£ (343)		£ 776
Off balance sheet loan commitments and financial guarantee contracts | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	344,510		345,160
Off balance sheet loan commitments and financial guarantee contracts | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (713)		£ (1,064)
Off balance sheet loan commitments and financial guarantee contracts | Stage 1
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.001		0.001	0.001
Off balance sheet loan commitments and financial guarantee contracts | Stage 1 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 298,150		£ 289,939
Off balance sheet loan commitments and financial guarantee contracts | Stage 1 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (228)		£ (256)
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 2
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.010		0.014	0.014
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 2 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 45,696		£ 52,891
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 2 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (436)		£ (758)
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 3
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Coverage ratio	0.074		0.021	0.021
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 3 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ 664		£ 2,330
Off balance sheet loan commitments and financial guarantee contracts | Lifetime expected credit losses | Stage 3 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(49)		(50)
Impairment charge on other financial assets
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Loan impairment release	(17)		153
Impairment charge on other financial assets | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	186,000		180,300
Impairment charge on other financial assets | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(114)		(165)
Impairment charge on other financial assets | Stage 1 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	185,800		175,700
Impairment charge on other financial assets | Stage 1 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(9)		(11)
Financial assets at fair value through other comprehensive income | Lifetime expected credit losses | Stage 2 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	58		4,400	$ (4.4)
Financial assets at fair value through other comprehensive income | Lifetime expected credit losses | Stage 2 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	(3)		(9)
Other assets | Lifetime expected credit losses | Stage 3 | Gross exposure
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	109		154
Other assets | Lifetime expected credit losses | Stage 3 | Impairment allowance
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total impairment allowance	£ (102)		£ (145)

Credit Risk - Loans and advan_2

Credit Risk - Loans and advances at amortised cost by product (Details) £ in Millions	Jun. 30, 2021GBP (£)	Dec. 31, 2020GBP (£)
Disclosure of financial assets [line items]
Total impairment allowance	£ 692,346	£ 686,728
Coverage ratio	0.010	0.014
Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance	£ 699,576	£ 696,127
Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance	(7,230)	(9,399)
Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 348,549	£ 342,632
Coverage ratio	0.018	0.024
Financial assets at amortised cost, class | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 166,345	£ 159,647
Coverage ratio	0.003	0.003
Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 39,008	£ 40,813
Coverage ratio	0.102	0.123
Financial assets at amortised cost, class | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 143,196	£ 142,172
Coverage ratio	0.011	0.015
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 355,066	£ 350,967
Financial assets at amortised cost, class | Gross exposure | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	166,818	160,185
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	43,461	46,513
Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	144,787	144,269
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(6,517)	(8,335)
Financial assets at amortised cost, class | Impairment allowance | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(473)	(538)
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(4,453)	(5,700)
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ (1,591)	£ (2,097)
Stage 1
Disclosure of financial assets [line items]
Coverage ratio	0.002	0.002
Stage 1 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance	£ 603,132	£ 580,903
Stage 1 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance	(1,413)	(1,289)
Stage 1 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 303,797	£ 289,931
Coverage ratio	0.004	0.004
Stage 1 | Financial assets at amortised cost, class | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 144,088	£ 138,606
Coverage ratio	0	0
Stage 1 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 33,703	£ 32,341
Coverage ratio	0.024	0.021
Stage 1 | Financial assets at amortised cost, class | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 126,006	£ 118,984
Coverage ratio	0.003	0.003
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 304,982	£ 290,964
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	144,103	138,639
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	34,537	33,021
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	126,342	119,304
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(1,185)	(1,033)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(15)	(33)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(834)	(680)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ (336)	£ (320)
Lifetime expected credit losses | Stage 2
Disclosure of financial assets [line items]
Coverage ratio	0.030	0.042
Lifetime expected credit losses | Stage 2 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance	£ 88,007	£ 103,897
Lifetime expected credit losses | Stage 2 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance	(2,669)	(4,322)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 40,078	£ 47,442
Coverage ratio	0.053	0.070
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 20,411	£ 19,228
Coverage ratio	0.003	0.004
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 4,384	£ 7,551
Coverage ratio	0.287	0.268
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 15,283	£ 20,663
Coverage ratio	0.025	0.033
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Not past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 36,409	£ 42,533
Coverage ratio	0.052	0.068
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Not past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 17,935	£ 16,594
Coverage ratio	0.003	0.003
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Not past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 4,095	£ 7,088
Coverage ratio	0.274	0.252
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Not past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 14,379	£ 18,851
Coverage ratio	0.026	0.033
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Less than or equal to 30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 2,384	£ 3,183
Coverage ratio	0.044	0.071
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Less than or equal to 30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 1,660	£ 1,772
Coverage ratio	0.004	0.007
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Less than or equal to 30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 200	£ 364
Coverage ratio	0.333	0.331
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Less than or equal to 30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 524	£ 1,047
Coverage ratio	0.009	0.046
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | >30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 1,285	£ 1,726
Coverage ratio	0.097	0.118
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | >30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 816	£ 862
Coverage ratio	0.009	0.016
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | >30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 89	£ 99
Coverage ratio	0.574	0.676
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | >30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 380	£ 765
Coverage ratio	0.028	0.014
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 42,311	£ 51,006
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	20,480	19,312
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	6,151	10,320
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	15,680	21,374
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Not past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	38,393	45,622
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Not past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	17,991	16,651
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Not past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	5,642	9,470
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Not past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	14,760	19,501
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Less than or equal to 30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	2,495	3,426
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Less than or equal to 30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	1,666	1,785
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Less than or equal to 30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	300	544
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Less than or equal to 30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	529	1,097
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | >30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	1,423	1,958
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | >30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	823	876
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | >30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	209	306
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | >30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	391	776
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(2,233)	(3,564)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(69)	(84)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(1,767)	(2,769)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	(397)	(711)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Not past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(1,984)	(3,089)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Not past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(56)	(57)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Not past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(1,547)	(2,382)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Not past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	(381)	(650)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Less than or equal to 30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(111)	(243)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Less than or equal to 30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(6)	(13)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Less than or equal to 30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(100)	(180)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Less than or equal to 30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	(5)	(50)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | >30 days past due | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(138)	(232)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | >30 days past due | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(7)	(14)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | >30 days past due | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(120)	(207)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | >30 days past due | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ (11)	£ (11)
Lifetime expected credit losses | Stage 3
Disclosure of financial assets [line items]
Coverage ratio	0.373	0.334
Lifetime expected credit losses | Stage 3 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance	£ 8,437	£ 11,327
Lifetime expected credit losses | Stage 3 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance	(3,148)	(3,788)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 4,674	£ 5,259
Coverage ratio	0.399	0.415
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 1,846	£ 1,813
Coverage ratio	0.174	0.188
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	£ 921	£ 921
Coverage ratio	0.668	0.710
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ 1,907	£ 2,525
Coverage ratio	0.310	0.297
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	£ 7,773	£ 8,997
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	2,235	2,234
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	2,773	3,172
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	2,765	3,591
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance	(3,099)	(3,738)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Disclosure of financial assets [line items]
Total impairment allowance	(389)	(421)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Total impairment allowance	(1,852)	(2,251)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Disclosure of financial assets [line items]
Total impairment allowance	£ (858)	£ (1,066)

Credit Risk - Loans and advan_3

Credit Risk - Loans and advances at amortised cost by selected sectors (Details) £ in Millions, $ in Billions	Dec. 31, 2021GBP (£)	Jun. 30, 2021GBP (£)	Jun. 30, 2021USD ($)	Dec. 31, 2020GBP (£)	Dec. 31, 2020USD ($)
Disclosure of financial assets [line items]
Total impairment allowance		£ 692,346		£ 686,728
Coverage ratio		0.010	0.010	0.014	0.014
Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance		£ 699,576		£ 696,127
Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance		(7,230)		(9,399)
Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 348,549		£ 342,632
Coverage ratio		0.018	0.018	0.024	0.024
Financial assets at amortised cost, class | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Coverage ratio		0.034	0.034	0.045	0.045
Financial assets at amortised cost, class | Total loans and advances at amortised cost | UK Commercial real estate
Disclosure of financial assets [line items]
Total impairment allowance | $			$ 9.4		$ 10
Coverage ratio		0.0061	0.0061	0.0098	0.0098
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 355,066		£ 350,967
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ 17,395		£ 18,739
Total of Wholesale exposures		12.00%	12.00%	13.00%	13.00%
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ 648		£ 948
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		6,224		7,140
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		2,576		3,073
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		5,199		5,343
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		717		709
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		2,031		1,526
Financial assets at amortised cost, class | Impairment allowance | Undrawn loans and receivables
Disclosure of financial assets [line items]
Total impairment allowance	£ (100)	(100)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		(6,517)		(8,335)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ (591)		£ (842)
Total of Wholesale exposures		37.00%	37.00%	40.00%	40.00%
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ (34)		£ (59)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		(165)		(229)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		(154)		(198)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		(137)		(237)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		(40)		(33)
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		£ (61)		£ (86)
Stage 1
Disclosure of financial assets [line items]
Coverage ratio		0.002	0.002	0.002	0.002
Stage 1 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance		£ 603,132		£ 580,903
Stage 1 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance		(1,413)		(1,289)
Stage 1 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 303,797		£ 289,931
Coverage ratio		0.004	0.004	0.004	0.004
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 304,982		£ 290,964
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ 12,543		£ 11,924
Total of Wholesale exposures		10.00%	10.00%	10.00%	10.00%
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ 305		£ 367
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		4,019		4,440
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		1,877		1,754
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		4,089		3,907
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		485		308
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		1,768		1,148
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		(1,185)		(1,033)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ (153)		£ (192)
Total of Wholesale exposures		45.00%	45.00%	60.00%	60.00%
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ (3)		£ (9)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		(48)		(53)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		(14)		(31)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		(63)		(78)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		(5)		(2)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		£ (20)		£ (19)
Lifetime expected credit losses | Stage 2
Disclosure of financial assets [line items]
Coverage ratio		0.030	0.030	0.042	0.042
Lifetime expected credit losses | Stage 2 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance		£ 88,007		£ 103,897
Lifetime expected credit losses | Stage 2 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance		(2,669)		(4,322)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 40,078		£ 47,442
Coverage ratio		0.053	0.053	0.070	0.070
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 42,311		£ 51,006
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ 4,037		£ 5,561
Total of Wholesale exposures		26.00%	26.00%	26.00%	26.00%
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ 322		£ 525
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		1,907		2,387
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		465		854
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		962		1,153
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		220		389
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		161		253
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		(2,233)		(3,564)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ (162)		£ (260)
Total of Wholesale exposures		41.00%	41.00%	37.00%	37.00%
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ (13)		£ (27)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		(68)		(115)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		(12)		(27)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		(30)		(51)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		(35)		(30)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		£ (4)		£ (10)
Lifetime expected credit losses | Stage 3
Disclosure of financial assets [line items]
Coverage ratio		0.373	0.373	0.334	0.334
Lifetime expected credit losses | Stage 3 | Gross exposure
Disclosure of financial assets [line items]
Total impairment allowance		£ 8,437		£ 11,327
Lifetime expected credit losses | Stage 3 | Impairment allowance
Disclosure of financial assets [line items]
Total impairment allowance		(3,148)		(3,788)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 4,674		£ 5,259
Coverage ratio		0.399	0.399	0.415	0.415
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		£ 7,773		£ 8,997
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ 815		£ 1,254
Total of Wholesale exposures		29.00%	29.00%	35.00%	35.00%
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ 21		£ 56
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		298		313
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		234		465
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		148		283
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		12		12
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		102		125
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Total impairment allowance		(3,099)		(3,738)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Selected sectors
Disclosure of financial assets [line items]
Total impairment allowance		£ (276)		£ (390)
Total of Wholesale exposures		32.00%	32.00%	37.00%	37.00%
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Air travel
Disclosure of financial assets [line items]
Total impairment allowance		£ (18)		£ (23)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Hospitality and leisure
Disclosure of financial assets [line items]
Total impairment allowance		(49)		(61)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Oil and gas
Disclosure of financial assets [line items]
Total impairment allowance		(128)		(140)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Retail
Disclosure of financial assets [line items]
Total impairment allowance		(44)		(108)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Shipping
Disclosure of financial assets [line items]
Total impairment allowance		0		(1)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost | Transportation
Disclosure of financial assets [line items]
Total impairment allowance		£ (37)		£ (57)

Credit Risk - Movement in gross

Credit Risk - Movement in gross exposures and impairment allowance including provisions for loan commitments and financial guarantees (Details) £ in Millions, $ in Billions	6 Months Ended		12 Months Ended
	Jun. 30, 2021GBP (£)	Jun. 30, 2020GBP (£)	Dec. 31, 2020GBP (£)	Dec. 31, 2020USD ($)
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Income statement release for the period	£ (742)	£ 3,738	£ 4,838
Total impairment allowance	(692,346)		(686,728)
Financial guarantee contracts
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Post write-off recoveries	31	15
Net releasein ECL	216	279
Total loans and advances at amortised cost
Loans and advances at amortised cost
Opening balance	9,399
Closing balance	7,230		9,399
Home loans
Loans and advances at amortised cost
Opening balance	538
Closing balance	473		538
Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	6,083
Closing balance	4,679		6,083
Wholesale loans
Loans and advances at amortised cost
Opening balance	2,778
Closing balance	2,078		2,778
Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Income statement release for the period	(343)		776
Total impairment allowance	(343,797)		(344,096)
Impairment charge on other financial assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Income statement release for the period	(17)		153
Gross exposure
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(699,576)		(696,127)
Gross exposure | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(7,416)
Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(1,139)
Gross exposure | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	2,255
Gross exposure | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(344,510)		(345,160)
Gross exposure | Impairment charge on other financial assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(186,000)		(180,300)
Impairment allowance
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	7,230		9,399
Impairment allowance | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(148)
Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(207)
Impairment allowance | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	713		1,064
Impairment allowance | Impairment charge on other financial assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	114		165
Financial assets at amortised cost, class | Total loans and advances at amortised cost
Loans and advances at amortised cost
Write-offs	1,001	953
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Income statement release for the period	(382)		3,909
Post write-off recoveries	31	15
Net write-offs	970	£ 938
Total impairment allowance	(348,549)		(342,632)
Financial assets at amortised cost, class | Home loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(166,345)		(159,647)
Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(39,008)		(40,813)
Financial assets at amortised cost, class | Wholesale loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(143,196)		(142,172)
Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(355,066)		(350,967)
Financial assets at amortised cost, class | Gross exposure | Home loans
Loans and advances at amortised cost
Opening balance	160,185
Business activity in the year	19,611
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(5,461)
Final repayments	7,505
Disposals	0
Write-offs	12
Closing balance	166,818		160,185
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(166,818)		(160,185)
Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	46,513
Business activity in the year	3,944
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(4,065)
Final repayments	1,996
Disposals	101
Write-offs	834
Closing balance	43,461		46,513
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(43,461)		(46,513)
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period	2,200
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Opening balance	144,269
Business activity in the year	24,638
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(151)
Final repayments	22,099
Disposals	1,715
Write-offs	155
Closing balance	144,787		144,269
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(144,787)		(144,269)
Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Barclays Asset Finance
Loans and advances at amortised cost
Disposals	1,000
Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
ECL movement excluding assets derecognised due to disposals and write-offs	(699)
Recoveries and reimbursements	185
Exchange and other adjustments	132
Total impairment allowance	6,517		8,335
Financial assets at amortised cost, class | Impairment allowance | Home loans
Loans and advances at amortised cost
Opening balance	538
Business activity in the year	3
Changes to models used for calculation	34
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(79)
Final repayments	(11)
Disposals	0
Write-offs	(12)
Closing balance	473		538
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
ECL movement excluding assets derecognised due to disposals and write-offs	(53)
Total impairment allowance	473		538
Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	5,700
Business activity in the year	72
Changes to models used for calculation	(24)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(274)
Final repayments	(113)
Disposals	(74)
Write-offs	(834)
Closing balance	4,453		5,700
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
ECL movement excluding assets derecognised due to disposals and write-offs	(339)
Total impairment allowance	4,453		5,700
Net releasein ECL	300
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Opening balance	2,097
Business activity in the year	87
Changes to models used for calculation	(36)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(191)
Final repayments	(167)
Disposals	(44)
Write-offs	(155)
Closing balance	1,591		2,097
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
ECL movement excluding assets derecognised due to disposals and write-offs	(307)
Total impairment allowance	1,591		2,097
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Debt securities at amortised cost | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Disposals	700
Stage 1 | Gross exposure
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(603,132)		(580,903)
Stage 1 | Gross exposure | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(7,397)
Stage 1 | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(1,005)
Stage 1 | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	1,603
Stage 1 | Gross exposure | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(298,150)		(289,939)
Stage 1 | Gross exposure | Impairment charge on other financial assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(185,800)		(175,700)
Stage 1 | Impairment allowance
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	1,413		1,289
Stage 1 | Impairment allowance | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Stage 1 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(215)
Stage 1 | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(146)
Stage 1 | Impairment allowance | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	228		256
Stage 1 | Impairment allowance | Impairment charge on other financial assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	9		11
Stage 1 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(303,797)		(289,931)
Stage 1 | Financial assets at amortised cost, class | Home loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(144,088)		(138,606)
Stage 1 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(33,703)		(32,341)
Stage 1 | Financial assets at amortised cost, class | Wholesale loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(126,006)		(118,984)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(304,982)		(290,964)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans
Loans and advances at amortised cost
Opening balance	138,639
Business activity in the year	19,231
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(4,670)
Final repayments	6,204
Disposals	0
Write-offs	0
Closing balance	144,103		138,639
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(144,103)		(138,639)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(6,369)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	3,615
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(160)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	21
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	33,021
Business activity in the year	3,855
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(3,134)
Final repayments	1,757
Disposals	0
Write-offs	0
Closing balance	34,537		33,021
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(34,537)		(33,021)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(1,590)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	4,376
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(264)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	30
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Opening balance	119,304
Business activity in the year	23,266
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	81
Final repayments	18,854
Disposals	1,495
Write-offs	0
Closing balance	126,342		119,304
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(126,342)		(119,304)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(4,636)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	8,410
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(249)
Stage 1 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	515
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	1,185		1,033
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Loans and advances at amortised cost
Opening balance	33
Business activity in the year	2
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(38)
Final repayments	(1)
Disposals	0
Write-offs	0
Closing balance	15		33
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	15		33
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(2)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	21
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	680
Business activity in the year	50
Changes to models used for calculation	(5)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(866)
Final repayments	(46)
Disposals	0
Write-offs	0
Closing balance	834		680
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	834		680
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(72)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	1,080
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(12)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	25
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Opening balance	320
Business activity in the year	35
Changes to models used for calculation	(7)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(153)
Final repayments	(39)
Disposals	(8)
Write-offs	0
Closing balance	336		320
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	336		320
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(12)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	188
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(2)
Stage 1 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	14
Lifetime expected credit losses | Stage 2 | Gross exposure
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(88,007)		(103,897)
Lifetime expected credit losses | Stage 2 | Gross exposure | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(17)
Lifetime expected credit losses | Stage 2 | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	114
Lifetime expected credit losses | Stage 2 | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	680
Lifetime expected credit losses | Stage 2 | Gross exposure | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(45,696)		(52,891)
Lifetime expected credit losses | Stage 2 | Gross exposure | Financial assets at fair value through other comprehensive income
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(58)		(4,400)	$ 4.4
Lifetime expected credit losses | Stage 2 | Impairment allowance
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	2,669		4,322
Lifetime expected credit losses | Stage 2 | Impairment allowance | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Lifetime expected credit losses | Stage 2 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	63
Lifetime expected credit losses | Stage 2 | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(63)
Lifetime expected credit losses | Stage 2 | Impairment allowance | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	436		758
Lifetime expected credit losses | Stage 2 | Impairment allowance | Financial assets at fair value through other comprehensive income
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	3		9
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(40,078)		(47,442)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Home loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(20,411)		(19,228)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(4,384)		(7,551)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Wholesale loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(15,283)		(20,663)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(42,311)		(51,006)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans
Loans and advances at amortised cost
Opening balance	19,312
Business activity in the year	380
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(667)
Final repayments	1,081
Disposals	0
Write-offs	0
Closing balance	20,480		19,312
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(20,480)		(19,312)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	6,369
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(3,615)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(337)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	119
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	10,320
Business activity in the year	58
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(808)
Final repayments	99
Disposals	0
Write-offs	0
Closing balance	6,151		10,320
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(6,151)		(10,320)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	1,590
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(4,376)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(572)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	38
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Opening balance	21,374
Business activity in the year	1,181
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(47)
Final repayments	3,042
Disposals	162
Write-offs	0
Closing balance	15,680		21,374
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(15,680)		(21,374)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	4,636
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(8,410)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(226)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	376
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	2,233		3,564
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Loans and advances at amortised cost
Opening balance	84
Business activity in the year	1
Changes to models used for calculation	(4)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	13
Final repayments	(2)
Disposals	0
Write-offs	0
Closing balance	69		84
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	69		84
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	2
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(21)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(7)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	3
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	2,769
Business activity in the year	14
Changes to models used for calculation	(33)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	310
Final repayments	(17)
Disposals	0
Write-offs	0
Closing balance	1,767		2,769
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	1,767		2,769
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	72
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(1,080)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(282)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	14
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Opening balance	711
Business activity in the year	30
Changes to models used for calculation	(29)
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(37)
Final repayments	(95)
Disposals	(3)
Write-offs	0
Closing balance	397		711
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	397		711
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	12
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(188)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(17)
Lifetime expected credit losses | Stage 2 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	13
Lifetime expected credit losses | Stage 3 | Gross exposure
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(8,437)		(11,327)
Lifetime expected credit losses | Stage 3 | Gross exposure | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(2)
Lifetime expected credit losses | Stage 3 | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(248)
Lifetime expected credit losses | Stage 3 | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(28)
Lifetime expected credit losses | Stage 3 | Gross exposure | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(664)		(2,330)
Lifetime expected credit losses | Stage 3 | Gross exposure | Other assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(109)		(154)
Lifetime expected credit losses | Stage 3 | Impairment allowance
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	3,148		3,788
Lifetime expected credit losses | Stage 3 | Impairment allowance | Home loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Lifetime expected credit losses | Stage 3 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	4
Lifetime expected credit losses | Stage 3 | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	2
Lifetime expected credit losses | Stage 3 | Impairment allowance | Impairment charge on loan commitments and other financial guarantees
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	49		50
Lifetime expected credit losses | Stage 3 | Impairment allowance | Other assets
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	102		145
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(4,674)		(5,259)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Home loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(1,846)		(1,813)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Credit cards, unsecured loans and other retail lending
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(921)		(921)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Wholesale loans
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(1,907)		(2,525)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(7,773)		(8,997)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans
Loans and advances at amortised cost
Opening balance	2,234
Business activity in the year	0
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(124)
Final repayments	220
Disposals	0
Write-offs	12
Closing balance	2,235		2,234
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(2,235)		(2,234)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	497
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(140)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	3,172
Business activity in the year	31
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(123)
Final repayments	140
Disposals	101
Write-offs	834
Closing balance	2,773		3,172
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(2,773)		(3,172)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	836
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(68)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans
Loans and advances at amortised cost
Opening balance	3,591
Business activity in the year	191
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(185)
Final repayments	203
Disposals	58
Write-offs	155
Closing balance	2,765		3,591
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	(2,765)		(3,591)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	475
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Gross exposure | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(891)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Total loans and advances at amortised cost
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	3,099		3,738
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans
Loans and advances at amortised cost
Opening balance	421
Business activity in the year	0
Changes to models used for calculation	38
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(54)
Final repayments	(8)
Disposals	0
Write-offs	(12)
Closing balance	389		421
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	389		421
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	7
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Home loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(3)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending
Loans and advances at amortised cost
Opening balance	2,251
Business activity in the year	8
Changes to models used for calculation	14
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	282
Final repayments	(50)
Disposals	(74)
Write-offs	(834)
Closing balance	1,852		2,251
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	1,852		2,251
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	294
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Credit cards, unsecured loans and other retail lending | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	(39)
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans
Loans and advances at amortised cost
Opening balance	1,066
Business activity in the year	22
Changes to models used for calculation	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(1)
Final repayments	(33)
Disposals	(33)
Write-offs	(155)
Closing balance	858		1,066
Reconciliation of ECL movement to impairment (charge)/release for the period, Loans and advances at amortised cost
Total impairment allowance	858		£ 1,066
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 1 to Stage 2
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 2 to Stage 1
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	0
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers to Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	19
Lifetime expected credit losses | Stage 3 | Financial assets at amortised cost, class | Impairment allowance | Wholesale loans | Transfers from Stage 3
Loans and advances at amortised cost
Increase (decrease) through transfers, financial assets	£ (27)

Credit Risk - Movement in gro_2

Credit Risk - Movement in gross exposure for loan commitment and financial guarantees (Details) £ in Millions	6 Months Ended
	Jun. 30, 2021GBP (£)
Gross exposure | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	£ 12,382
Net transfers between stages	0
Business activity in the year	6,288
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(7,416)
Limit management and final repayments	(263)
Ending balance	10,991
Gross exposure | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	126,717
Net transfers between stages	0
Business activity in the year	3,411
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(1,139)
Limit management and final repayments	(5,396)
Ending balance	123,593
Gross exposure | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	206,061
Net transfers between stages	0
Business activity in the year	40,138
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	2,255
Limit management and final repayments	(38,528)
Ending balance	209,926
Impairment allowance | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	0
Net transfers between stages	0
Business activity in the year	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Limit management and final repayments	0
Ending balance	0
Impairment allowance | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	383
Net transfers between stages	0
Business activity in the year	3
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(148)
Limit management and final repayments	(12)
Ending balance	226
Impairment allowance | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	681
Net transfers between stages	0
Business activity in the year	126
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(207)
Limit management and final repayments	(113)
Ending balance	487
Stage 1 | Gross exposure | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	11,861
Net transfers between stages	(74)
Business activity in the year	6,287
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(7,397)
Limit management and final repayments	(238)
Ending balance	10,439
Stage 1 | Gross exposure | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	114,371
Net transfers between stages	5,784
Business activity in the year	3,378
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(1,005)
Limit management and final repayments	(4,941)
Ending balance	117,587
Stage 1 | Gross exposure | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	163,707
Net transfers between stages	682
Business activity in the year	37,211
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	1,603
Limit management and final repayments	(33,079)
Ending balance	170,124
Stage 1 | Impairment allowance | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	0
Net transfers between stages	0
Business activity in the year	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Limit management and final repayments	0
Ending balance	0
Stage 1 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	55
Net transfers between stages	217
Business activity in the year	1
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(215)
Limit management and final repayments	(4)
Ending balance	54
Stage 1 | Impairment allowance | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	201
Net transfers between stages	116
Business activity in the year	28
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(146)
Limit management and final repayments	(25)
Ending balance	174
Lifetime expected credit losses | Stage 2 | Gross exposure | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	516
Net transfers between stages	71
Business activity in the year	1
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(17)
Limit management and final repayments	(22)
Ending balance	549
Lifetime expected credit losses | Stage 2 | Gross exposure | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	12,117
Net transfers between stages	(6,081)
Business activity in the year	32
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	114
Limit management and final repayments	(398)
Ending balance	5,784
Lifetime expected credit losses | Stage 2 | Gross exposure | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	40,258
Net transfers between stages	504
Business activity in the year	2,915
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	680
Limit management and final repayments	(4,994)
Ending balance	39,363
Lifetime expected credit losses | Stage 2 | Impairment allowance | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	0
Net transfers between stages	0
Business activity in the year	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Limit management and final repayments	0
Ending balance	0
Lifetime expected credit losses | Stage 2 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	305
Net transfers between stages	(212)
Business activity in the year	1
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	63
Limit management and final repayments	(5)
Ending balance	152
Lifetime expected credit losses | Stage 2 | Impairment allowance | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	453
Net transfers between stages	(112)
Business activity in the year	89
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(63)
Limit management and final repayments	(83)
Ending balance	284
Lifetime expected credit losses | Stage 3 | Gross exposure | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	5
Net transfers between stages	3
Business activity in the year	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(2)
Limit management and final repayments	(3)
Ending balance	3
Lifetime expected credit losses | Stage 3 | Gross exposure | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	229
Net transfers between stages	297
Business activity in the year	1
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(248)
Limit management and final repayments	(57)
Ending balance	222
Lifetime expected credit losses | Stage 3 | Gross exposure | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	2,096
Net transfers between stages	(1,186)
Business activity in the year	12
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	(28)
Limit management and final repayments	(455)
Ending balance	439
Lifetime expected credit losses | Stage 3 | Impairment allowance | Home loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	0
Net transfers between stages	0
Business activity in the year	0
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	0
Limit management and final repayments	0
Ending balance	0
Lifetime expected credit losses | Stage 3 | Impairment allowance | Credit cards, unsecured loans and other retail lending
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	23
Net transfers between stages	(5)
Business activity in the year	1
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	4
Limit management and final repayments	(3)
Ending balance	20
Lifetime expected credit losses | Stage 3 | Impairment allowance | Wholesale loans
Increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts [abstract]
Opening balance	27
Net transfers between stages	(4)
Business activity in the year	9
Net drawdowns, repayments, net re-measurement and movement due to exposure and risk parameter changes	2
Limit management and final repayments	(5)
Ending balance	£ 29

Credit Risk - Management adjust

Credit Risk - Management adjustments to models for impairment (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disclosure of financial assets [line items]
Management adjustments to impairment allowances	£ 1,871	£ 1,388
Proportion of total impairment allowances	25.90%	14.80%
Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets, Before adjustments	£ 5,359	£ 8,011
Allowance account for credit losses of financial assets	7,230	9,399
Total loans and advances at amortised cost | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	2,090	2,067
Total loans and advances at amortised cost | Other adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	(219)	(679)
Total loans and advances at amortised cost | Modelled ECL
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets, Before adjustments	4,300	6,800
Allowance account for credit losses of financial assets	400
Total loans and advances at amortised cost | ECL from individually assessed impairments on stage 3 loans
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets, Before adjustments	800	900
Total loans and advances at amortised cost | ECL from non-modelled and other management adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets, Before adjustments	300	300
Allowance account for credit losses of financial assets	(200)	(300)
Home loans
Disclosure of financial assets [line items]
Management adjustments to impairment allowances	£ 83	£ 131
Proportion of total impairment allowances	17.50%	24.30%
Allowance account for credit losses of financial assets, Before adjustments	£ 390	£ 407
Allowance account for credit losses of financial assets	473	538
Home loans | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	41	21
Home loans | Other adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	42	110
Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Management adjustments to impairment allowances	£ 1,145	£ 1,234
Proportion of total impairment allowances	24.50%	20.30%
Allowance account for credit losses of financial assets, Before adjustments	£ 3,534	£ 4,849
Allowance account for credit losses of financial assets	4,679	6,083
Credit cards, unsecured loans and other retail lending | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	1,398	1,625
Credit cards, unsecured loans and other retail lending | Other adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	(253)	(391)
Wholesale loans
Disclosure of financial assets [line items]
Management adjustments to impairment allowances	£ 643	£ 23
Proportion of total impairment allowances	30.90%	0.80%
Allowance account for credit losses of financial assets, Before adjustments	£ 1,435	£ 2,755
Allowance account for credit losses of financial assets	2,078	2,778
Wholesale loans | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	651	421
Wholesale loans | Other adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ (8)	£ (398)

Credit Risk - Economic uncertai

Credit Risk - Economic uncertainty adjustments (Details) £ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021GBP (£)method	Dec. 31, 2020GBP (£)	Dec. 31, 2019	Dec. 31, 2021GBP (£)
Covid-19 related uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ 2,100	£ 2,100
Number Of Methods To Determine Uncertainty Adjustments | method	2
Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ 4,679	6,083
Credit cards, unsecured loans and other retail lending | Covid-19 related uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	900
Credit cards, unsecured loans and other retail lending | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	1,398	1,625
Total loans and advances at amortised cost
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	7,230	9,399
Total loans and advances at amortised cost | Covid-19 related uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets				£ 1,200
Total loans and advances at amortised cost | Covid-19 related uncertainty adjustments | Guarantees
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	100
Total loans and advances at amortised cost | Covid-19 related uncertainty adjustments | Customers
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	500	700
Total loans and advances at amortised cost | Covid-19 related uncertainty adjustments | Specific bases
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ 500	1,200
Unemployment rate	7.20%
Total loans and advances at amortised cost | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ 2,090	2,067
Wholesale loans
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	2,078	2,778
Wholesale loans | Covid-19 related uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	300
Wholesale loans | Economic uncertainty adjustments
Disclosure of financial assets [line items]
Allowance account for credit losses of financial assets	£ 651	£ 421
Financial assets at amortised cost, class
Disclosure of financial assets [line items]
Arrears collection period	30 days
Financial assets at amortised cost, class | USA | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Decrease in arrears collection rate	(1.60%)
Arrears collection rate		2.50%	2.70%
Financial assets at amortised cost, class | UK | Credit cards, unsecured loans and other retail lending
Disclosure of financial assets [line items]
Decrease in arrears collection rate	(1.40%)	(1.70%)	(1.70%)

Credit Risk - Measurement uncer

Credit Risk - Measurement uncertainty, narrative (Details) £ in Millions	6 Months Ended
	Jun. 30, 2021GBP (£)economic_scenario	Dec. 31, 2020GBP (£)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Number of economic scenarios to calculate ECL	5
Management adjustments to impairment allowances | £	£ 1,871	£ 1,388
Credit risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Number of economic scenarios to calculate ECL	5
Number of economic variables to calculate ECL	8
Stress horizon period, ECL	5 years
Term at which scenario converges to steady state	8 years
Calculation period for ECL estimates	3 years
Credit risk | Downside Scenario
Disclosure of nature and extent of risks arising from financial instruments [line items]
Number of economic scenarios to calculate ECL	2
Credit risk | Upside Scenario
Disclosure of nature and extent of risks arising from financial instruments [line items]
Number of economic scenarios to calculate ECL	2
Baseline | UK | Later than three months and not later than six months | Unemployment
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	6.00%
Downside 2 | UK
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	9.80%
Downside 2 | UK | Later than one month and not later than three months | Unemployment
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	10.00%
Downside 2 | USA
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	12.00%
Downside 2 | USA | Later than one month and not later than three months | Unemployment
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	12.00%
Upside 2 | UK | Later than one year [member] | Unemployment | Maximum
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	5.00%
Upside 2 | USA | Later than one year [member] | Unemployment | Maximum
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	4.00%

Credit Risk - Measurement unc_2

Credit Risk - Measurement uncertainty - Baseline average macroeconomic variables used in the calculation of ECL (Details)	Jun. 30, 2021	Dec. 31, 2020
Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	26.40%	24.70%
Baseline | GDP | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.90%	6.30%
Baseline | GDP | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.60%	3.30%
Baseline | GDP | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.30%	2.60%
Baseline | GDP | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.70%	3.90%
Baseline | GDP | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.90%	3.10%
Baseline | GDP | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.60%	2.90%
Baseline | Unemployment | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.80%	6.70%
Baseline | Unemployment | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.70%	6.40%
Baseline | Unemployment | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.10%	5.80%
Baseline | Unemployment | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.60%	6.90%
Baseline | Unemployment | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.50%	5.70%
Baseline | Unemployment | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.40%	5.60%
Baseline | HPI | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(0.50%)	2.40%
Baseline | HPI | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	2.30%
Baseline | HPI | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.10%	5.00%
Baseline | HPI | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.90%	2.80%
Baseline | HPI | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.50%	4.70%
Baseline | HPI | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.50%	4.70%
Baseline | UK bank rate | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.00%
Baseline | UK bank rate | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	(0.10%)
Baseline | UK bank rate | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.40%	0.00%
Baseline | US federal funds rate | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Baseline | US federal funds rate | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Baseline | US federal funds rate | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.70%	0.30%
Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	12.60%	15.40%
Downside 2 | GDP | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(1.70%)	(3.90%)
Downside 2 | GDP | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.00%	6.50%
Downside 2 | GDP | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.20%	2.60%
Downside 2 | GDP | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.50%	(2.40%)
Downside 2 | GDP | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.40%	3.60%
Downside 2 | GDP | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.00%	2.10%
Downside 2 | Unemployment | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.30%	8.00%
Downside 2 | Unemployment | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.20%	9.30%
Downside 2 | Unemployment | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.60%	7.80%
Downside 2 | Unemployment | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.70%	13.40%
Downside 2 | Unemployment | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	11.00%	11.90%
Downside 2 | Unemployment | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	9.30%	10.10%
Downside 2 | HPI | UK
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	11.80%
Downside 2 | HPI | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(5.80%)	(13.60%)
Downside 2 | HPI | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(5.80%)	(10.80%)
Downside 2 | HPI | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	0.50%
Downside 2 | HPI | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(4.90%)	(17.20%)
Downside 2 | HPI | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(3.00%)	(0.70%)
Downside 2 | HPI | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.10%	0.60%
Downside 2 | UK bank rate | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	(0.20%)
Downside 2 | UK bank rate | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.00%	(0.20%)
Downside 2 | UK bank rate | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.00%	(0.10%)
Downside 2 | US federal funds rate | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Downside 2 | US federal funds rate | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Downside 2 | US federal funds rate | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Downside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	16.90%	15.50%
Downside 1 | GDP | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.60%	0.10%
Downside 1 | GDP | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.40%	6.60%
Downside 1 | GDP | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.20%	3.20%
Downside 1 | GDP | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.40%	0.40%
Downside 1 | GDP | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.50%	3.60%
Downside 1 | GDP | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.60%	2.30%
Downside 1 | Unemployment | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.40%	7.30%
Downside 1 | Unemployment | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.60%	8.00%
Downside 1 | Unemployment | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.60%	6.90%
Downside 1 | Unemployment | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.40%	11.00%
Downside 1 | Unemployment | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.90%	8.90%
Downside 1 | Unemployment | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.10%	6.90%
Downside 1 | HPI | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(3.10%)	(6.70%)
Downside 1 | HPI | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(2.70%)	(3.50%)
Downside 1 | HPI | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.70%	1.70%
Downside 1 | HPI | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(0.50%)	(5.90%)
Downside 1 | HPI | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	1.80%
Downside 1 | HPI | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.30%	2.60%
Downside 1 | UK bank rate | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	(0.10%)
Downside 1 | UK bank rate | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	(0.10%)
Downside 1 | UK bank rate | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	0.00%
Downside 1 | US federal funds rate | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Downside 1 | US federal funds rate | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Downside 1 | US federal funds rate | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Upside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	19.60%	20.20%
Upside 2 | GDP | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.80%	12.20%
Upside 2 | GDP | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	9.40%	5.30%
Upside 2 | GDP | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.00%	3.90%
Upside 2 | GDP | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.50%	7.10%
Upside 2 | GDP | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.20%	4.60%
Upside 2 | GDP | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.40%	4.00%
Upside 2 | Unemployment | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.50%	6.20%
Upside 2 | Unemployment | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.90%	5.50%
Upside 2 | Unemployment | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.40%	4.80%
Upside 2 | Unemployment | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.30%	5.50%
Upside 2 | Unemployment | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.80%	4.30%
Upside 2 | Unemployment | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.80%	4.10%
Upside 2 | HPI | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.60%	6.60%
Upside 2 | HPI | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	9.90%	10.40%
Upside 2 | HPI | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	11.30%	10.80%
Upside 2 | HPI | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.50%	8.80%
Upside 2 | HPI | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.00%	9.10%
Upside 2 | HPI | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.30%	8.90%
Upside 2 | UK bank rate | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.10%
Upside 2 | UK bank rate | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.40%	0.30%
Upside 2 | UK bank rate | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.60%	0.30%
Upside 2 | US federal funds rate | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Upside 2 | US federal funds rate | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.40%
Upside 2 | US federal funds rate | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.10%	0.60%
Upside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	24.50%	24.20%
Upside 1 | GDP | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.90%	9.30%
Upside 1 | GDP | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.30%	3.90%
Upside 1 | GDP | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.00%	3.40%
Upside 1 | GDP | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.10%	5.50%
Upside 1 | GDP | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.80%	4.00%
Upside 1 | GDP | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.40%	3.70%
Upside 1 | Unemployment | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.60%	6.40%
Upside 1 | Unemployment | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.20%	6.00%
Upside 1 | Unemployment | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.70%	5.20%
Upside 1 | Unemployment | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.50%	6.00%
Upside 1 | Unemployment | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.20%	4.80%
Upside 1 | Unemployment | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.20%	4.60%
Upside 1 | HPI | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.50%	4.60%
Upside 1 | HPI | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.50%	6.10%
Upside 1 | HPI | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.40%	6.10%
Upside 1 | HPI | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.20%	6.80%
Upside 1 | HPI | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.80%	6.70%
Upside 1 | HPI | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.70%	6.30%
Upside 1 | UK bank rate | UK | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.10%
Upside 1 | UK bank rate | UK | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	0.10%
Upside 1 | UK bank rate | UK | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.60%	0.30%
Upside 1 | US federal funds rate | USA | 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Upside 1 | US federal funds rate | USA | 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%
Upside 1 | US federal funds rate | USA | 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.90%	0.50%

Credit Risk - Measurement unc_3

Credit Risk - Measurement uncertainty - Scenario probability weighting (Details)	Jun. 30, 2021	Dec. 31, 2020
Upside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	19.60%	20.20%
Upside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	24.50%	24.20%
Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	26.40%	24.70%
Downside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	16.90%	15.50%
Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	12.60%	15.40%

Credit Risk - Measurement unc_4

Credit Risk - Measurement uncertainty - Macroeconomic variables (specific bases and 5-year averages) (Details)	Jun. 30, 2021	Dec. 31, 2020
Upside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	19.60%	20.20%
Upside 2 | GDP | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	25.90%	14.20%
Upside 2 | GDP | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.20%	2.50%
Upside 2 | GDP | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	23.70%	15.70%
Upside 2 | GDP | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.60%	2.90%
Upside 2 | Unemployment | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.10%	4.00%
Upside 2 | Unemployment | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.60%	5.00%
Upside 2 | Unemployment | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.80%	3.80%
Upside 2 | Unemployment | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.10%	5.30%
Upside 2 | HPI | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	48.20%	48.20%
Upside 2 | HPI | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.20%	8.20%
Upside 2 | HPI | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	41.20%	42.20%
Upside 2 | HPI | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.10%	7.30%
Upside 2 | UK bank rate | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.10%
Upside 2 | UK bank rate | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.70%	0.30%
Upside 2 | US federal funds rate | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.10%
Upside 2 | US federal funds rate | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.10%	0.50%
Upside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	24.50%	24.20%
Upside 1 | GDP | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	20.20%	8.80%
Upside 1 | GDP | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.20%	1.60%
Upside 1 | GDP | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	18.30%	12.80%
Upside 1 | GDP | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.70%	2.40%
Upside 1 | Unemployment | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.30%	4.00%
Upside 1 | Unemployment | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.80%	5.30%
Upside 1 | Unemployment | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.20%	3.80%
Upside 1 | Unemployment | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.40%	5.70%
Upside 1 | HPI | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	25.50%	30.80%
Upside 1 | HPI | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.70%	5.50%
Upside 1 | HPI | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	32.60%	30.90%
Upside 1 | HPI | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.80%	5.50%
Upside 1 | UK bank rate | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.10%
Upside 1 | UK bank rate | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.60%	0.20%
Upside 1 | US federal funds rate | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.10%
Upside 1 | US federal funds rate | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.90%	0.50%
Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	26.40%	24.70%
Baseline | GDP | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.30%	0.70%
Baseline | GDP | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.30%	0.70%
Baseline | GDP | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.80%	1.60%
Baseline | GDP | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.80%	1.60%
Baseline | Unemployment | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.10%	5.70%
Baseline | Unemployment | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.10%	5.70%
Baseline | Unemployment | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.70%	6.40%
Baseline | Unemployment | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	4.70%	6.40%
Baseline | HPI | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.60%	3.60%
Baseline | HPI | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.60%	3.60%
Baseline | HPI | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.60%	3.80%
Baseline | HPI | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	3.60%	3.80%
Baseline | UK bank rate | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.40%	0.00%
Baseline | UK bank rate | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.40%	0.00%
Baseline | US federal funds rate | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.80%	0.30%
Baseline | US federal funds rate | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.80%	0.30%
Downside 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	16.90%	15.50%
Downside 1 | GDP | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(4.20%)	(22.10%)
Downside 1 | GDP | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.60%	0.10%
Downside 1 | GDP | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(0.20%)	(10.60%)
Downside 1 | GDP | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	2.00%	0.80%
Downside 1 | Unemployment | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	7.50%	8.40%
Downside 1 | Unemployment | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	5.70%	6.50%
Downside 1 | Unemployment | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.90%	13.00%
Downside 1 | Unemployment | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.30%	8.30%
Downside 1 | HPI | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(5.80%)	(4.50%)
Downside 1 | HPI | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.00%	(0.20%)
Downside 1 | HPI | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(1.30%)	(3.70%)
Downside 1 | HPI | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.60%	0.80%
Downside 1 | UK bank rate | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.60%
Downside 1 | UK bank rate | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.20%	0.00%
Downside 1 | US federal funds rate | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.50%	1.30%
Downside 1 | US federal funds rate | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.60%	0.30%
Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	12.60%	15.40%
Downside 2 | GDP | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(8.10%)	(22.10%)
Downside 2 | GDP | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.80%	(0.90%)
Downside 2 | GDP | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(3.20%)	(10.60%)
Downside 2 | GDP | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	1.40%	0.10%
Downside 2 | Unemployment | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	9.80%	10.10%
Downside 2 | Unemployment | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	6.50%	7.20%
Downside 2 | Unemployment | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	12.00%	13.70%
Downside 2 | Unemployment | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	8.50%	10.40%
Downside 2 | HPI | UK
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	11.80%
Downside 2 | HPI | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(11.80%)	18.30%
Downside 2 | HPI | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(1.60%)	(3.60%)
Downside 2 | HPI | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(7.90%)	(15.90%)
Downside 2 | HPI | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	(0.40%)	(3.00%)
Downside 2 | UK bank rate | UK | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.10%	0.60%
Downside 2 | UK bank rate | UK | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.00%	(0.10%)
Downside 2 | US federal funds rate | USA | Specific bases
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.80%	1.30%
Downside 2 | US federal funds rate | USA | 5-year averages
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	0.30%	0.30%

Credit Risk - Measurement unc_5

Credit Risk - Measurement uncertainty - ECL under 100% weighted scenarios for modelled portfolios, narrative (Details) £ in Millions	6 Months Ended
	Jun. 30, 2021GBP (£)economic_scenario	Dec. 31, 2020GBP (£)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Weighted expected credit loss, uplift percentage	100.00%
Average EAD period	12 months
Treasury Assets ECL	£ 4
Number of economic scenarios to calculate ECL | economic_scenario	5
Total impairment allowance	£ 692,346	£ 686,728
Coverage ratio	0.010	0.014
Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Transfers into Stage 2	£ 18,000
Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.030	0.042
Credit risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Number of economic scenarios to calculate ECL | economic_scenario	5
Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Weighted expected credit loss, uplift percentage	5.50%
Scenario probability weighting	26.40%	24.70%
Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	12.60%	15.40%
Total loans and advances at amortised cost | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 348,549	£ 342,632
Coverage ratio	0.018	0.024
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 40,078	£ 47,442
Coverage ratio	0.053	0.070
Home loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 166,345	£ 159,647
Coverage ratio	0.003	0.003
Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 20,411	£ 19,228
Coverage ratio	0.003	0.004
Home loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Home loans | Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Weighted expected credit loss, uplift percentage	0.30%
Home loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Home loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.003
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 39,008	£ 40,813
Coverage ratio	0.102	0.123
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 4,384	£ 7,551
Coverage ratio	0.287	0.268
Credit cards, unsecured loans and other retail lending | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.15	0.165
Credit cards, unsecured loans and other retail lending | Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Weighted expected credit loss, uplift percentage	5.00%
Credit cards, unsecured loans and other retail lending | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.143	0.162
Credit cards, unsecured loans and other retail lending | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.199	0.184
Wholesale loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 143,196	£ 142,172
Coverage ratio	0.011	0.015
Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 15,283	£ 20,663
Coverage ratio	0.025	0.033
Wholesale loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.023	0.043
Wholesale loans | Baseline
Disclosure of nature and extent of risks arising from financial instruments [line items]
Weighted expected credit loss, uplift percentage	8.80%
Wholesale loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.021	0.041
Wholesale loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.032	0.058
UK | Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	9.80%
UK | Downside 2 | HPI
Disclosure of nature and extent of risks arising from financial instruments [line items]
Scenario probability weighting	11.80%
USA | Downside 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Unemployment rate	12.00%
Impairment allowance
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (7,230)	£ (9,399)
Impairment allowance | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,669)	(4,322)
Impairment allowance | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,769)	(6,770)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(6,517)	(8,335)
Increase (decrease) in financial assets	(699)
Impairment allowance | Total loans and advances at amortised cost | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,233)	(3,564)
Impairment allowance | Total loans and advances at amortised cost | Credit risk | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,769)	(6,770)
Impairment allowance | Total loans and advances at amortised cost | Baseline | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,522)	(6,453)
Impairment allowance | Total loans and advances at amortised cost | Downside 2 | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(7,088)	(9,933)
Impairment allowance | Home loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(473)	(538)
Increase (decrease) in financial assets	(53)
Impairment allowance | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(69)	(84)
Impairment allowance | Home loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(348)	(350)
Impairment allowance | Home loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(20)	(37)
Impairment allowance | Home loans | Baseline | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(347)	(329)
Impairment allowance | Home loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(18)	(33)
Impairment allowance | Home loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(399)	(491)
Impairment allowance | Home loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(39)	(63)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,453)	(5,700)
Increase (decrease) in financial assets	(339)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,767)	(2,769)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Credit risk | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,333)	(4,602)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,076)	(2,207)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Baseline | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,175)	(4,511)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(976)	(2,138)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Downside 2 | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,923)	(6,057)
Impairment allowance | Credit cards, unsecured loans and other retail lending | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,517)	(3,564)
Impairment allowance | Wholesale loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,591)	(2,097)
Increase (decrease) in financial assets	(307)
Impairment allowance | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(397)	(711)
Impairment allowance | Wholesale loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,088)	(1,818)
Impairment allowance | Wholesale loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(773)	(1,410)
Impairment allowance | Wholesale loans | Baseline | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,000)	(1,613)
Impairment allowance | Wholesale loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(709)	(1,223)
Impairment allowance | Wholesale loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,766)	(3,385)
Impairment allowance | Wholesale loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,342)	(2,911)
Gross exposure
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	699,576	696,127
Gross exposure | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	88,007	103,897
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	355,066	350,967
Gross exposure | Total loans and advances at amortised cost | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	42,311	51,006
Gross exposure | Home loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	166,818	160,185
Gross exposure | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	20,480	19,312
Gross exposure | Home loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	24,345	19,180
Gross exposure | Home loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	24,785	18,188
Gross exposure | Home loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	28,526	22,233
Gross exposure | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	43,461	46,513
Gross exposure | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	6,151	10,320
Gross exposure | Credit cards, unsecured loans and other retail lending | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	7,175	13,399
Increase (decrease) in financial assets	5,500
Gross exposure | Credit cards, unsecured loans and other retail lending | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	6,819	13,176
Gross exposure | Credit cards, unsecured loans and other retail lending | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	12,625	19,322
Gross exposure | Wholesale loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	144,787	144,269
Gross exposure | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	15,680	21,374
Gross exposure | Wholesale loans | Credit risk | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	33,666	32,677
Gross exposure | Wholesale loans | Baseline | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	33,276	29,635
Gross exposure | Wholesale loans | Downside 2 | Financial assets at amortised cost, class | Modelled ECL | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 41,676	£ 50,361

Credit Risk - Measurement unc_6

Credit Risk - Measurement uncertainty - ECL under 100% weighted scenarios for modelled portfolios (Details) £ in Millions	Jun. 30, 2021GBP (£)	Dec. 31, 2020GBP (£)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 692,346	£ 686,728
Coverage ratio	0.010	0.014
Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.002	0.002
Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.030	0.042
Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.373	0.334
Gross exposure
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 699,576	£ 696,127
Gross exposure | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	603,132	580,903
Gross exposure | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	88,007	103,897
Gross exposure | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	8,437	11,327
Impairment allowance
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(7,230)	(9,399)
Impairment allowance | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,769)	(6,770)
Impairment allowance | ECL from individually assessed impairments on stage 3 loans
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(783)	(902)
Impairment allowance | ECL from non-modelled and other management adjustments
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,678)	(1,727)
Impairment allowance | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,413)	(1,289)
Impairment allowance | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,669)	(4,322)
Impairment allowance | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,148)	(3,788)
Total loans and advances at amortised cost
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	(7,230)	(9,399)
Total loans and advances at amortised cost | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	(400)
Total loans and advances at amortised cost | ECL from post-model adjustments
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	1,900	1,400
Total loans and advances at amortised cost | ECL from non-modelled and other management adjustments
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	200	300
Total loans and advances at amortised cost | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 348,549	£ 342,632
Coverage ratio	0.018	0.024
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 303,797	£ 289,931
Coverage ratio	0.004	0.004
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 40,078	£ 47,442
Coverage ratio	0.053	0.070
Total loans and advances at amortised cost | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 4,674	£ 5,259
Coverage ratio	0.399	0.415
Total loans and advances at amortised cost | Gross exposure | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 355,066	£ 350,967
Total loans and advances at amortised cost | Gross exposure | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	304,982	290,964
Total loans and advances at amortised cost | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	42,311	51,006
Total loans and advances at amortised cost | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	7,773	8,997
Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(6,517)	(8,335)
Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,185)	(1,033)
Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,233)	(3,564)
Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,099)	(3,738)
Home loans
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	(473)	(538)
Home loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 166,345	£ 159,647
Coverage ratio	0.003	0.003
Home loans | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 144,088	£ 138,606
Coverage ratio	0	0
Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 20,411	£ 19,228
Coverage ratio	0.003	0.004
Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 1,846	£ 1,813
Coverage ratio	0.174	0.188
Home loans | Gross exposure | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 166,818	£ 160,185
Allowance account for credit losses of financial assets	(166,818)	(160,185)
Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	144,103	138,639
Allowance account for credit losses of financial assets	(144,103)	(138,639)
Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	20,480	19,312
Allowance account for credit losses of financial assets	(20,480)	(19,312)
Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,235	2,234
Allowance account for credit losses of financial assets	(2,235)	(2,234)
Home loans | Impairment allowance | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(473)	(538)
Allowance account for credit losses of financial assets	(473)	(538)
Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(15)	(33)
Allowance account for credit losses of financial assets	(15)	(33)
Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(69)	(84)
Allowance account for credit losses of financial assets	(69)	(84)
Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(389)	(421)
Allowance account for credit losses of financial assets	(389)	(421)
Credit cards, unsecured loans and other retail lending
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	(4,679)	(6,083)
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 39,008	£ 40,813
Coverage ratio	0.102	0.123
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 33,703	£ 32,341
Coverage ratio	0.024	0.021
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 4,384	£ 7,551
Coverage ratio	0.287	0.268
Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 921	£ 921
Coverage ratio	0.668	0.710
Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 43,461	£ 46,513
Allowance account for credit losses of financial assets	(43,461)	(46,513)
Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	34,537	33,021
Allowance account for credit losses of financial assets	(34,537)	(33,021)
Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	6,151	10,320
Allowance account for credit losses of financial assets	(6,151)	(10,320)
Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,773	3,172
Allowance account for credit losses of financial assets	(2,773)	(3,172)
Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,453)	(5,700)
Allowance account for credit losses of financial assets	(4,453)	(5,700)
Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(834)	(680)
Allowance account for credit losses of financial assets	(834)	(680)
Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,767)	(2,769)
Allowance account for credit losses of financial assets	(1,767)	(2,769)
Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,852)	(2,251)
Allowance account for credit losses of financial assets	(1,852)	(2,251)
Wholesale loans
Disclosure of nature and extent of risks arising from financial instruments [line items]
Allowance account for credit losses of financial assets	(2,078)	(2,778)
Wholesale loans | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 143,196	£ 142,172
Coverage ratio	0.011	0.015
Wholesale loans | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 126,006	£ 118,984
Coverage ratio	0.003	0.003
Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 15,283	£ 20,663
Coverage ratio	0.025	0.033
Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 1,907	£ 2,525
Coverage ratio	0.310	0.297
Wholesale loans | Gross exposure | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 144,787	£ 144,269
Allowance account for credit losses of financial assets	(144,787)	(144,269)
Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	126,342	119,304
Allowance account for credit losses of financial assets	(126,342)	(119,304)
Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	15,680	21,374
Allowance account for credit losses of financial assets	(15,680)	(21,374)
Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,765	3,591
Allowance account for credit losses of financial assets	(2,765)	(3,591)
Wholesale loans | Impairment allowance | Financial assets at amortised cost, class
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,591)	(2,097)
Allowance account for credit losses of financial assets	(1,591)	(2,097)
Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(336)	(320)
Allowance account for credit losses of financial assets	(336)	(320)
Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(397)	(711)
Allowance account for credit losses of financial assets	(397)	(711)
Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(858)	(1,066)
Allowance account for credit losses of financial assets	(858)	(1,066)
Credit risk | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (4,769)	£ (6,770)
Credit risk | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Credit risk | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Credit risk | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.177	0.173
Credit risk | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 131,134	£ 131,422
Credit risk | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	24,345	19,180
Credit risk | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Credit risk | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(348)	(350)
Credit risk | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4)	(6)
Credit risk | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(20)	(37)
Credit risk | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (324)	£ (307)
Credit risk | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.009	0.008
Credit risk | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.15	0.165
Credit risk | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.791	0.775
Credit risk | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 44,014	£ 51,952
Credit risk | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	7,175	13,399
Credit risk | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Credit risk | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,333)	(4,602)
Credit risk | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(379)	(392)
Credit risk | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,076)	(2,207)
Credit risk | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,878)	£ (2,003)
Credit risk | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.002	0.002
Credit risk | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.023	0.043
Credit risk | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.049	0.066
Credit risk | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 160,174	£ 149,099
Credit risk | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	33,666	32,677
Credit risk | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Credit risk | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,088)	(1,818)
Credit risk | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(248)	(262)
Credit risk | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(773)	(1,410)
Credit risk | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(67)	(146)
Upside 2 | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (4,020)	£ (5,520)
Upside 2 | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Upside 2 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Upside 2 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.168	0.159
Upside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 133,584	£ 134,100
Upside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	21,895	16,502
Upside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Upside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(322)	(317)
Upside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2)	(4)
Upside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(13)	(31)
Upside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (307)	£ (282)
Upside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.006	0.006
Upside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.128	0.153
Upside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.779	0.753
Upside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 45,185	£ 53,271
Upside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	5,733	10,572
Upside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Upside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,852)	(3,881)
Upside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(269)	(316)
Upside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(733)	(1,618)
Upside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,850)	£ (1,947)
Upside 2 | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Upside 2 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.019	0.037
Upside 2 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.047	0.058
Upside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 162,762	£ 155,812
Upside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	31,077	25,963
Upside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Upside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(846)	(1,322)
Upside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(187)	(242)
Upside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(594)	(952)
Upside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(65)	(128)
Upside 1 | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (4,241)	£ (5,911)
Upside 1 | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Upside 1 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Upside 1 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.172	0.161
Upside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 132,343	£ 133,246
Upside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	23,136	17,356
Upside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Upside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(333)	(323)
Upside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3)	(5)
Upside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(15)	(32)
Upside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (315)	£ (286)
Upside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.006	0.006
Upside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.136	0.159
Upside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.785	0.763
Upside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 44,809	£ 52,932
Upside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	6,205	11,579
Upside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Upside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,993)	(4,149)
Upside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(288)	(340)
Upside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(841)	(1,837)
Upside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,864)	£ (1,972)
Upside 1 | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Upside 1 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.020	0.038
Upside 1 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.048	0.061
Upside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 162,201	£ 154,578
Upside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	31,639	27,198
Upside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Upside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(915)	(1,439)
Upside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(203)	(258)
Upside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(646)	(1,047)
Upside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(66)	(134)
Baseline | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (4,522)	£ (6,453)
Baseline | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Baseline | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Baseline | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.178	0.163
Baseline | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 130,694	£ 132,414
Baseline | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	24,785	18,188
Baseline | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Baseline | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(347)	(329)
Baseline | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4)	(6)
Baseline | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(18)	(33)
Baseline | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (325)	£ (290)
Baseline | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.007	0.007
Baseline | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.143	0.162
Baseline | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.790	0.774
Baseline | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 44,307	£ 51,995
Baseline | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	6,819	13,176
Baseline | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Baseline | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,175)	(4,511)
Baseline | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(324)	(372)
Baseline | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(976)	(2,138)
Baseline | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,875)	£ (2,001)
Baseline | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Baseline | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.021	0.041
Baseline | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.049	0.064
Baseline | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 160,564	£ 152,141
Baseline | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	33,276	29,635
Baseline | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Baseline | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,000)	(1,613)
Baseline | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(224)	(249)
Baseline | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(709)	(1,223)
Baseline | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(67)	(141)
Downside 1 | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (5,589)	£ (7,915)
Downside 1 | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Downside 1 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.002
Downside 1 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.184	0.179
Downside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 128,711	£ 130,547
Downside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	26,769	20,055
Downside 1 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Downside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(370)	(374)
Downside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(6)	(14)
Downside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(27)	(42)
Downside 1 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (337)	£ (318)
Downside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.011	0.008
Downside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.170	0.174
Downside 1 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.802	0.795
Downside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 42,383	£ 50,168
Downside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	9,066	16,477
Downside 1 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Downside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(3,905)	(5,335)
Downside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(456)	(415)
Downside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,544)	(2,865)
Downside 1 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,905)	£ (2,055)
Downside 1 | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.002	0.002
Downside 1 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.027	0.048
Downside 1 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.050	0.071
Downside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 158,614	£ 144,646
Downside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	35,225	37,130
Downside 1 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Downside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,314)	(2,206)
Downside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(306)	(278)
Downside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(939)	(1,771)
Downside 1 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(69)	(157)
Downside 2 | Total loans and advances at amortised cost | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (7,088)	£ (9,933)
Downside 2 | Home loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0	0
Downside 2 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.001	0.003
Downside 2 | Home loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.192	0.217
Downside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 126,953	£ 128,369
Downside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	28,526	22,233
Downside 2 | Home loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,829	1,778
Downside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(399)	(491)
Downside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(8)	(42)
Downside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(39)	(63)
Downside 2 | Home loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (352)	£ (386)
Downside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.012	0.009
Downside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.199	0.184
Downside 2 | Credit cards, unsecured loans and other retail lending | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.809	0.804
Downside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 39,252	£ 48,717
Downside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	12,625	19,322
Downside 2 | Credit cards, unsecured loans and other retail lending | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	2,374	2,585
Downside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(4,923)	(6,057)
Downside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(486)	(415)
Downside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(2,517)	(3,564)
Downside 2 | Credit cards, unsecured loans and other retail lending | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (1,920)	£ (2,078)
Downside 2 | Wholesale loans | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.002	0.002
Downside 2 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.032	0.058
Downside 2 | Wholesale loans | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Coverage ratio	0.052	0.083
Downside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ 152,164	£ 131,415
Downside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	41,676	50,361
Downside 2 | Wholesale loans | Gross exposure | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	1,374	2,211
Downside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,766)	(3,385)
Downside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Stage 1 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(352)	(290)
Downside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 2 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	(1,342)	(2,911)
Downside 2 | Wholesale loans | Impairment allowance | Financial assets at amortised cost, class | Lifetime expected credit losses | Stage 3 | Modelled ECL
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total impairment allowance	£ (72)	£ (184)