v3.25.4
Offsetting financial assets and financial liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Derivative assets £ 252,192 £ 292,356
Reverse repurchase agreements and other similar secured lending 17,662 3,393
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Derivative liabilities (240,757) (279,331)
Repurchase agreements and other similar secured borrowing 18,651 29,397
Settlements assets liabilities offset amounts 38,196 25,133
Cash collateral netted    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements [abstract]    
Amounts offset   (5,126)
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position [abstract]    
Amounts offset 6,086  
Total liabilities    
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position [abstract]    
Gross amounts (1,084,284) (1,056,043)
Amounts offset 673,162 602,259
Net amounts reported on the balance sheet (411,122) (453,784)
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Financial instruments 194,772 230,260
Financial collateral 204,113 208,494
Net amount (12,237) (15,030)
Amounts not subject to enforceable netting arrangements (7,143) (10,968)
Total liabilities (418,265) (464,752)
Derivative financial instruments    
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position [abstract]    
Gross amounts (278,710) (318,990)
Amounts offset 43,257 46,040
Net amounts reported on the balance sheet (235,453) (272,950)
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Financial instruments 194,772 230,260
Financial collateral 28,444 27,660
Net amount (12,237) (15,030)
Amounts not subject to enforceable netting arrangements (5,304) (6,381)
Cash collateral pledged 23,267 23,109
Non-cash collateral pledged 5,177 4,551
Derivative financial instruments | Cash collateral netted    
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position [abstract]    
Amounts offset 5,400 6,293
Repurchase agreements and other similar secured borrowing    
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position [abstract]    
Gross amounts (805,574) (737,053)
Amounts offset 629,905 556,219
Net amounts reported on the balance sheet (175,669) (180,834)
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Financial instruments 0 0
Financial collateral 175,669 180,834
Net amount 0 0
Amounts not subject to enforceable netting arrangements (1,839) (4,587)
Repurchase agreements and other similar secured borrowing 177,508 185,421
Repurchase agreements and other similar secured borrowing | Financial liabilities at fair value    
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Net amount (158,857) (156,024)
Repurchase agreements and other similar secured borrowing | Financial liabilities at amortised cost    
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Net amount (18,651) (29,397)
Total assets    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements [abstract]    
Gross amounts 1,070,127 1,033,716
Amounts offset (672,476) (603,426)
Net amounts reported on the balance sheet 397,651 430,290
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Financial instruments (194,772) (230,260)
Financial collateral (191,571) (184,933)
Net amount 11,308 15,097
Amounts not subject to enforceable netting arrangements 4,803 7,250
Total assets 402,454 437,540
Derivative financial instruments    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements [abstract]    
Gross amounts 290,878 333,711
Amounts offset (42,571) (47,207)
Net amounts reported on the balance sheet 248,307 286,504
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Financial instruments (194,772) (230,260)
Financial collateral (42,576) (41,586)
Net amount 10,959 14,658
Amounts not subject to enforceable netting arrangements 3,885 5,852
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities [abstract]    
Cash collateral 29,930 28,953
Non-cash collateral 12,646 12,633
Reverse repurchase agreements and other similar secured lending    
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements [abstract]    
Gross amounts 779,249 700,005
Amounts offset (629,905) (556,219)
Net amounts reported on the balance sheet 149,344 143,786
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Financial instruments 0 0
Financial collateral (148,995) (143,347)
Net amount 349 439
Amounts not subject to enforceable netting arrangements 918 1,398
Reverse repurchase agreements and other similar secured lending 150,262 145,184
Reverse repurchase agreements and other similar secured lending | Net gains on financial instruments designated at fair value    
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Net amount 132,600 141,791
Reverse repurchase agreements and other similar secured lending | Financial assets at amortised cost    
Amounts subject to enforceable master netting arrangement or similar agreement not set off against financial assets [abstract]    
Net amount £ 17,662 £ 3,393