v3.25.4
Risk Management - Disclosure of maximum exposure and effects of collateral and other credit enhancements (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Loans and advances £ 1,232,975 £ 1,204,773  
Notional contract amount 100,079,291 83,792,768  
Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (4,034) (3,860)  
Loan commitments      
Disclosure of detailed information about financial instruments [line items]      
Notional contract amount 355,388 353,777  
Loans and advances at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 150,786 144,827  
Loans and advances at amortised cost | Financial assets at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 150,786 144,827  
Loans and advances at amortised cost | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (3,617) (3,420)  
Retail mortgages      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 4,952 4,956  
Retail mortgages | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (33) (41) £ (360)
Retail mortgages | Financial assets at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 4,952 4,956  
Retail mortgages | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (33) (41)  
Retail credit cards      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 20,527 19,749  
Retail credit cards | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (2,586) (2,557) (2,776)
Retail credit cards | Financial assets at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 20,527 19,749  
Retail credit cards | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (2,586) (2,557)  
Retail other      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 4,128 3,918  
Retail other | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (32) (31) (45)
Retail other | Financial assets at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 4,128 3,918  
Retail other | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (32) (31)  
Corporate loans      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 121,179 116,204  
Corporate loans | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (966) (791) £ (836)
Corporate loans | Financial assets at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances 121,179 116,204  
Corporate loans | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (966) (791)  
Credit risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 1,529,075 1,506,980  
Netting and set-off (197,749) (233,266)  
Cash collateral (36,139) (36,846)  
Non-cash collateral (333,991) (315,829)  
Risk transfer (11,584) (12,083)  
Exposure net of risk mitigation 949,612 908,956  
On-balance sheet | Credit risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 1,147,054 1,126,638  
Netting and set-off (197,749) (233,266)  
Cash collateral (33,880) (33,632)  
Non-cash collateral (283,958) (263,576)  
Risk transfer (9,014) (9,995)  
Exposure net of risk mitigation 622,453 586,169  
On-balance sheet | Credit risk | Cash and balances at central banks      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 208,544 180,365  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 208,544 180,365  
On-balance sheet | Credit risk | Cash collateral and settlement balances      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 124,519 113,987  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 124,519 113,987  
On-balance sheet | Credit risk | Reverse repurchase agreements and other similar secured lending      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 17,662 3,393  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (17,662) (3,393)  
Risk transfer 0 0  
Exposure net of risk mitigation 0 0  
On-balance sheet | Credit risk | Derivative financial instruments      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 252,192 292,356  
Netting and set-off (194,772) (230,260)  
Cash collateral (29,930) (28,953)  
Non-cash collateral (12,646) (12,633)  
Risk transfer (4,121) (5,284)  
Exposure net of risk mitigation 10,723 15,226  
On-balance sheet | Credit risk | Other assets      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 624 665  
Netting and set-off 0 0  
Cash collateral (1) (1)  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 623 664  
On-balance sheet | Credit risk | Assets held for sale      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 5,801 9,544  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 5,801 9,544  
On-balance sheet | Credit risk | Loans and advances at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 150,786 144,827  
Netting and set-off (2,977) (3,006)  
Cash collateral (2,499) (2,232)  
Non-cash collateral (72,122) (64,821)  
Risk transfer (4,893) (4,569)  
Exposure net of risk mitigation 68,295 70,199  
On-balance sheet | Credit risk | Retail mortgages      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 4,952 4,956  
Netting and set-off 0 0  
Cash collateral (11) (22)  
Non-cash collateral (4,921) (4,922)  
Risk transfer (6) 0  
Exposure net of risk mitigation 14 12  
On-balance sheet | Credit risk | Retail credit cards      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 20,527 19,749  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 20,527 19,749  
On-balance sheet | Credit risk | Retail other      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 4,128 3,918  
Netting and set-off 0 0  
Cash collateral (1,064) (1,106)  
Non-cash collateral (2,617) (2,441)  
Risk transfer (43) (33)  
Exposure net of risk mitigation 404 338  
On-balance sheet | Credit risk | Corporate loans      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 121,179 116,204  
Netting and set-off (2,977) (3,006)  
Cash collateral (1,424) (1,104)  
Non-cash collateral (64,584) (57,458)  
Risk transfer (4,844) (4,536)  
Exposure net of risk mitigation 47,350 50,100  
On-balance sheet | Credit risk | Financial assets at amortised cost | Debt securities      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 55,153 50,227  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (136) (583)  
Risk transfer 0 (40)  
Exposure net of risk mitigation 55,017 49,604  
On-balance sheet | Credit risk | Financial assets at amortised cost | Government and Government sponsored debt      
Disclosure of detailed information about financial instruments [line items]      
Risk transfer (100) (100)  
Loans and advances 100 200  
On-balance sheet | Credit risk | Total trading portfolio assets      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 106,289 91,275  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (5,546) (1,535)  
Risk transfer 0 0  
Exposure net of risk mitigation 100,743 89,740  
On-balance sheet | Credit risk | Total trading portfolio assets | Debt securities      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 94,040 77,805  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (639) (657)  
Risk transfer 0 0  
Exposure net of risk mitigation 93,401 77,148  
On-balance sheet | Credit risk | Total trading portfolio assets | Traded loans      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 12,249 13,470  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (4,907) (878)  
Risk transfer 0 0  
Exposure net of risk mitigation 7,342 12,592  
On-balance sheet | Credit risk | Total financial assets at fair value through the income statement      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 182,666 188,989  
Netting and set-off 0 0  
Cash collateral (1,450) (2,446)  
Non-cash collateral (173,456) (179,507)  
Risk transfer 0 0  
Exposure net of risk mitigation 7,760 7,036  
On-balance sheet | Credit risk | Total financial assets at fair value through the income statement | Debt securities      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 3,121 2,931  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (359) (182)  
Risk transfer 0 0  
Exposure net of risk mitigation 2,762 2,749  
On-balance sheet | Credit risk | Total financial assets at fair value through the income statement | Loans and advances      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 46,885 44,182  
Netting and set-off 0 0  
Cash collateral (17) (17)  
Non-cash collateral (42,290) (40,401)  
Risk transfer 0 0  
Exposure net of risk mitigation 4,578 3,764  
On-balance sheet | Credit risk | Total financial assets at fair value through the income statement | Reverse repurchase agreements      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 132,600 141,791  
Netting and set-off 0 0  
Cash collateral (1,433) (2,429)  
Non-cash collateral (130,807) (138,924)  
Risk transfer 0 0  
Exposure net of risk mitigation 360 438  
On-balance sheet | Credit risk | Total financial assets at fair value through the income statement | Other financial assets      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 60 85  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 60 85  
On-balance sheet | Credit risk | Financial assets at fair value through other comprehensive income      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 42,818 51,010  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (2,390) (1,104)  
Risk transfer 0 (102)  
Exposure net of risk mitigation 40,428 49,804  
On-balance sheet | Credit risk | Credit-impaired | Loans and advances at amortised cost      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 2,389 2,038  
Netting and set-off 0 0  
Cash collateral (22) (53)  
Non-cash collateral (1,238) (822)  
Risk transfer (247) (87)  
Exposure net of risk mitigation 882 1,076  
On-balance sheet | Credit risk | Credit-impaired | Retail mortgages      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 151 278  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral (151) (277)  
Risk transfer 0 0  
Exposure net of risk mitigation 0 1  
On-balance sheet | Credit risk | Credit-impaired | Retail credit cards      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 381 308  
Netting and set-off 0 0  
Cash collateral 0 0  
Non-cash collateral 0 0  
Risk transfer 0 0  
Exposure net of risk mitigation 381 308  
On-balance sheet | Credit risk | Credit-impaired | Retail other      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 87 191  
Netting and set-off 0 0  
Cash collateral 0 (21)  
Non-cash collateral (84) (162)  
Risk transfer 0 0  
Exposure net of risk mitigation 3 8  
On-balance sheet | Credit risk | Credit-impaired | Corporate loans      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 1,770 1,261  
Netting and set-off 0 0  
Cash collateral (22) (32)  
Non-cash collateral (1,003) (383)  
Risk transfer (247) (87)  
Exposure net of risk mitigation 498 759  
Off-balance sheet | Financial assets at amortised cost | Accumulated impairment      
Disclosure of detailed information about financial instruments [line items]      
Loans and advances (398) (420)  
Off-balance sheet | Credit risk      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 382,021 380,342  
Netting and set-off 0 0  
Cash collateral (2,259) (3,214)  
Non-cash collateral (50,033) (52,253)  
Risk transfer (2,570) (2,088)  
Exposure net of risk mitigation 327,159 322,787  
Notional contract amount 81,500 108,600  
Off-balance sheet | Credit risk | Contingent liabilities      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 26,633 26,565  
Netting and set-off 0 0  
Cash collateral (1,768) (2,664)  
Non-cash collateral (768) (441)  
Risk transfer (194) (248)  
Exposure net of risk mitigation 23,903 23,212  
Off-balance sheet | Credit risk | Loan commitments      
Disclosure of detailed information about financial instruments [line items]      
Maximum exposure 355,388 353,777  
Netting and set-off 0 0  
Cash collateral (491) (550)  
Non-cash collateral (49,265) (51,812)  
Risk transfer (2,376) (1,840)  
Exposure net of risk mitigation £ 303,256 £ 299,575