v3.25.2
Credit risk - Management adjustments to models for impairment (Details) - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 0.60% (0.80%)
Impairment allowance | Co-branded card portolio | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets £ 200 £ 300
Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3,677 3,860
Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3,655 3,889
Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 22 (29)
Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 79 0
Economic uncertainty adjustments | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 6 0
Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets (57) (29)
Post-model adjustment | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 87  
Total loans and advances at amortised cost including debt securities | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 79 £ 0
Total loans and advances at amortised cost including debt securities | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 16  
Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 63  
Total loans and advances at amortised cost including debt securities | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Total loans and advances at amortised cost    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 0.60% (0.60%)
Total loans and advances at amortised cost | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 2.40% 6.70%
Total loans and advances at amortised cost | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets £ 240 £ 489
Total loans and advances at amortised cost | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3,656 3,840
Total loans and advances at amortised cost | Total impairment allowance | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 245 496
Total loans and advances at amortised cost | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3,635 3,862
Total loans and advances at amortised cost | Impairment allowance pre management adjustments | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 239 463
Total loans and advances at amortised cost | Modelled ECL | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3,400 3,700
Total loans and advances at amortised cost | Individually assessed impairments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 400 300
Total loans and advances at amortised cost | Non-modelled exposures | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 100 100
Total loans and advances at amortised cost | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 21 (22)
Total loans and advances at amortised cost | Management adjustments | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 6 33
Total loans and advances at amortised cost | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 78 0
Total loans and advances at amortised cost | Economic uncertainty adjustments | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 6 0
Total loans and advances at amortised cost | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets (57) (22)
Total loans and advances at amortised cost | Other adjustments | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 0 33
Total loans and advances at amortised cost | Stage 1 | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 56 99
Total loans and advances at amortised cost | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 15  
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 141 226
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 63  
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Impairment allowance | Assets classified as held for sale    
Disclosure of financial assets [line items]    
Financial assets 43 £ 164
Total loans and advances at amortised cost | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Retail mortgages    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 11.10% 7.30%
Retail mortgages | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 27 £ 41
Retail mortgages | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 27 41
Retail mortgages | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 24 38
Retail mortgages | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3 3
Retail mortgages | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 0
Retail mortgages | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3 3
Retail mortgages | Stage 1 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 5 8
Retail mortgages | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Retail mortgages | Lifetime expected credit losses | Stage 2 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 1
Retail mortgages | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Retail mortgages | Lifetime expected credit losses | Stage 3 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 22 £ 32
Retail mortgages | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Retail credit cards    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 1.20% (0.90%)
Retail credit cards | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 2,371 £ 2,557
Retail credit cards | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 2,417 2,607
Retail credit cards | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 2,387 2,630
Retail credit cards | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 30 (23)
Retail credit cards | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 30 0
Retail credit cards | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 (23)
Retail credit cards | Stage 1 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 297 334
Retail credit cards | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Retail credit cards | Lifetime expected credit losses | Stage 2 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 751 807
Retail credit cards | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 30  
Retail credit cards | Lifetime expected credit losses | Stage 3 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1,323 £ 1,416
Retail credit cards | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Retail other    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 0.00% 11.10%
Retail other | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 35 £ 31
Retail other | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 37 36
Retail other | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 37 32
Retail other | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 4
Retail other | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 0
Retail other | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 4
Retail other | Stage 1 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 12 5
Retail other | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Retail other | Lifetime expected credit losses | Stage 2 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 3 1
Retail other | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Retail other | Lifetime expected credit losses | Stage 3 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 20 £ 25
Retail other | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Corporate loans    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance (1.00%) (0.50%)
Corporate loans | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 818 £ 791
Corporate loans | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1,175 1,156
Corporate loans | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1,187 1,162
Corporate loans | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets (12) (6)
Corporate loans | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 48 0
Corporate loans | Economic uncertainty adjustments | Impairment allowance | Rest of the world    
Disclosure of financial assets [line items]    
Financial assets 87  
Corporate loans | Economic uncertainty adjustments | Barclays Investment Bank | Impairment allowance | Rest of the world    
Disclosure of financial assets [line items]    
Financial assets 51  
Corporate loans | Economic uncertainty adjustments | Barclays US Consumer Bank | Impairment allowance | Rest of the world    
Disclosure of financial assets [line items]    
Financial assets 36  
Corporate loans | Economic uncertainty adjustments | Barclays US Consumer Bank | Impairment allowance | Assets classified as held for sale | Rest of the world    
Disclosure of financial assets [line items]    
Financial assets 6  
Corporate loans | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets (60) (6)
Corporate loans | Stage 1 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 150 144
Corporate loans | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 15  
Corporate loans | Lifetime expected credit losses | Stage 2 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 261 254
Corporate loans | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 33  
Corporate loans | Lifetime expected credit losses | Stage 3 | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 407 £ 393
Corporate loans | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0  
Debt securities at amortised cost    
Disclosure of financial assets [line items]    
Proportion of Management adjustments to Total impairment allowance 4.80% (35.00%)
Debt securities at amortised cost | Total impairment allowance | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 21 £ 20
Debt securities at amortised cost | Impairment allowance pre management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 20 27
Debt securities at amortised cost | Management adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1 (7)
Debt securities at amortised cost | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1 0
Debt securities at amortised cost | Other adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 (7)
Debt securities at amortised cost | Stage 1 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1  
Debt securities at amortised cost | Lifetime expected credit losses | Stage 2 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Debt securities at amortised cost | Lifetime expected credit losses | Stage 3 | Economic uncertainty adjustments | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0  
Cash collateral and settlements | Management adjustments | Barclays Investment Bank | Other financial assets subject to impairment | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 0 (1)
Reverse repurchase agreements | Management adjustments | Barclays Investment Bank | Other financial assets subject to impairment | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 1 (2)
Financial assets at fair value through other comprehensive income | Management adjustments | Barclays Investment Bank | Other financial assets subject to impairment | Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets £ 0 £ (2)