v3.25.4
Risk Management - Disclosure of management adjustments to models for impairment and Economic uncertainty management adjustments by stage (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (1,232,975) £ (1,204,773)  
Proportion of Management adjustments to total impairment allowance 4.90% (0.80%)  
Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Proportion of Management adjustments to total impairment allowance 2.10% 6.70%  
Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 4,034 £ 3,860  
Accumulated impairment | Assets and liabilities classified as held for sale | Co-branded card portfolio      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 200 300  
Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 4,034 3,860  
Total impairment allowance | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 240 496  
Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 3,835 3,889  
Impairment allowance pre management adjustments | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 235 463  
ECL collectively assessed | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 3,451 3,712  
ECL from individually assessed impairments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 538 329  
ECL from benchmarked exposures and others | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 63 103  
Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 199 (29)  
Management adjustments | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 5 33  
Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 81 0  
Economic uncertainty adjustments | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 5 0  
Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 118 (29)  
Other adjustments | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0 33  
Loans and advances at amortised cost      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (150,786) £ (144,827)  
Proportion of Management adjustments to total impairment allowance 4.90% (0.60%)  
Loans and advances at amortised cost | Accumulated impairment | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 236 £ 489  
Loans and advances at amortised cost | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 552 491  
Loans and advances at amortised cost | Accumulated impairment | Stage 1 | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 66 99  
Loans and advances at amortised cost | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1,036 1,063  
Loans and advances at amortised cost | Accumulated impairment | Lifetime expected credit losses | Stage 2 | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 126 226  
Loans and advances at amortised cost | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 2,029 1,866  
Loans and advances at amortised cost | Accumulated impairment | Lifetime expected credit losses | Stage 3 | Assets and liabilities classified as held for sale      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 44 164  
Loans and advances at amortised cost | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 4,015 3,840  
Loans and advances at amortised cost | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 3,817 3,862  
Loans and advances at amortised cost | ECL collectively assessed | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 3,400 3,700  
Loans and advances at amortised cost | ECL from individually assessed impairments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 500 300  
Loans and advances at amortised cost | ECL from benchmarked exposures and others | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 100 100  
Loans and advances at amortised cost | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 198 (22)  
Loans and advances at amortised cost | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 80 0  
Loans and advances at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 16    
Loans and advances at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 64    
Loans and advances at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Loans and advances at amortised cost | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 118 (22)  
Retail mortgages      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (4,952) £ (4,956)  
Proportion of Management adjustments to total impairment allowance 24.20% 7.30%  
Retail mortgages | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 33 £ 41 £ 360
Retail mortgages | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 9 8 11
Retail mortgages | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0 1 28
Retail mortgages | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 24 32 321
Retail mortgages | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 33 41  
Retail mortgages | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 25 38  
Retail mortgages | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 8 3  
Retail mortgages | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0 0  
Retail mortgages | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail mortgages | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail mortgages | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail mortgages | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 8 3  
Retail credit cards      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (20,527) £ (19,749)  
Proportion of Management adjustments to total impairment allowance 4.50% (0.90%)  
Retail credit cards | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 2,586 £ 2,557 2,776
Retail credit cards | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 395 334 412
Retail credit cards | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 796 807 1,138
Retail credit cards | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1,395 1,416 1,226
Retail credit cards | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 2,623 2,607  
Retail credit cards | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 2,505 2,630  
Retail credit cards | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 118 (23)  
Retail credit cards | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 31 0  
Retail credit cards | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail credit cards | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 31    
Retail credit cards | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail credit cards | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 87 (23)  
Retail other      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (4,128) £ (3,918)  
Proportion of Management adjustments to total impairment allowance (3.00%) 11.10%  
Retail other | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 32 £ 31 45
Retail other | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 7 5 8
Retail other | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 5 1 2
Retail other | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 20 25 35
Retail other | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 33 36  
Retail other | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 34 32  
Retail other | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets (1) 4  
Retail other | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0 0  
Retail other | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail other | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail other | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Retail other | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets (1) 4  
Corporate loans      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ (121,179) £ (116,204)  
Proportion of Management adjustments to total impairment allowance 5.50% (0.50%)  
Corporate loans | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 966 £ 791 836
Corporate loans | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 141 144 179
Corporate loans | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 235 254 309
Corporate loans | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 590 393 £ 348
Corporate loans | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1,326 1,156  
Corporate loans | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1,253 1,162  
Corporate loans | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 73 (6)  
Corporate loans | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 49 0  
Corporate loans | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 16    
Corporate loans | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 33    
Corporate loans | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Corporate loans | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 24 £ (6)  
Debt securities at amortised cost      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Proportion of Management adjustments to total impairment allowance 5.30% (35.00%)  
Debt securities at amortised cost | Total impairment allowance | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 19 £ 20  
Debt securities at amortised cost | Impairment allowance pre management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 18 27  
Debt securities at amortised cost | Management adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1 (7)  
Debt securities at amortised cost | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1 0  
Debt securities at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1    
Debt securities at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Debt securities at amortised cost | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Debt securities at amortised cost | Other adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0 (7)  
Total loans and advances at amortised cost including debt securities      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets (205,939) (195,054)  
Total loans and advances at amortised cost including debt securities | Economic uncertainty adjustments | Accumulated impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 81    
Total loans and advances at amortised cost including debt securities | Economic uncertainty adjustments | Accumulated impairment | Stage 1      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 17    
Total loans and advances at amortised cost including debt securities | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 2      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 64    
Total loans and advances at amortised cost including debt securities | Economic uncertainty adjustments | Accumulated impairment | Lifetime expected credit losses | Stage 3      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 0    
Cash collateral and settlements | Management adjustments | Accumulated impairment | Barclays Investment Bank | Other financial assets subject to impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1 (1)  
Reverse repurchase agreements | Management adjustments | Accumulated impairment | Barclays Investment Bank | Other financial assets subject to impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets 1 (2)  
Financial assets at fair value through other comprehensive income | Management adjustments | Accumulated impairment | Barclays Investment Bank | Other financial assets subject to impairment      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Financial assets £ 0 £ (2)