v3.25.2
Fair value of financial instruments - Analysis of movements in Level 3 assets and liabilities (Details) - GBP (£)
£ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Net assets (liabilities) [abstract]      
Derivative financial assets £ 280,194   £ 293,530
Derivative financial liabilities (265,376)   (279,415)
Significant unobservable inputs (Level 3)      
Financial assets      
Beginning balance, financial assets 24,364    
Ending balance, financial assets 23,919    
Financial liabilities      
Beginning balance, financial liabilities (6,834)    
Ending balance, financial liabilities (6,133)    
Net assets (liabilities) [abstract]      
Derivative financial assets 1,989   2,077
Derivative financial liabilities (2,861)   £ (3,181)
Recurring fair value measurement | Significant unobservable inputs (Level 3)      
Net assets (liabilities) [abstract]      
Beginning balance, assets (liabilities) 17,530 £ 13,135  
Purchases, fair value measurement, assets (liabilities) net 7,130 7,559  
Sales, fair value measurement, assets (liabilities) net (5,803) (2,457)  
Issues, fair value measurement, assets (liabilities) net (617) (646)  
Settlements, fair value measurement, assets (liabilities) net (1,695) (1,247)  
Total gains or losses recognised in OCI, assets (liabilities) net 0 0  
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net 539 443  
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net 308 (417)  
Ending balance, assets (liabilities) 17,786 16,319  
Derivative financial assets 1,989 2,833  
Derivative financial liabilities (2,861) (4,335)  
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income      
Net assets (liabilities) [abstract]      
Total gains and losses in the period recognised in the income statement, assets (liabilities) net 354 (215)  
Recurring fair value measurement | Significant unobservable inputs (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income      
Net assets (liabilities) [abstract]      
Total gains and losses in the period recognised in the income statement, assets (liabilities) net 40 164  
Recurring fair value measurement | Investment property | Significant unobservable inputs (Level 3)      
Financial assets      
Beginning balance, financial assets 9 2  
Purchases, fair value measurement, assets 33 0  
Sales, fair value measurement, assets 0 (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 0  
Transfers out of Level 3 of fair value hierarchy, assets 0 0  
Ending balance, financial assets 42 1  
Recurring fair value measurement | Investment property | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category trading      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets 0 0  
Recurring fair value measurement | Investment property | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category other income      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets 0 0  
Recurring fair value measurement | Net derivative financial instruments | Significant unobservable inputs (Level 3)      
Net assets (liabilities) [abstract]      
Beginning balance, assets (liabilities) (1,104) (1,113)  
Purchases, fair value measurement, assets (liabilities) net (17) (182)  
Sales, fair value measurement, assets (liabilities) net 249 32  
Issues, fair value measurement, assets (liabilities) net 0 (19)  
Settlements, fair value measurement, assets (liabilities) net 0 (169)  
Total gains or losses recognised in OCI, assets (liabilities) net 0 0  
Transfers into Level 3 of fair value hierarchy, assets (liabilities) net (34) 21  
Transfers out of Level 3 of fair value hierarchy, assets (liabilities) net (135) 109  
Ending balance, assets (liabilities) (872) (1,502)  
Recurring fair value measurement | Net derivative financial instruments | Significant unobservable inputs (Level 3) | Net assets (liabilities) at fair value through profit or loss, category trading income      
Net assets (liabilities) [abstract]      
Total gains and losses in the period recognised in the income statement, assets (liabilities) net 166 (181)  
Recurring fair value measurement | Net derivative financial instruments | Significant unobservable inputs (Level 3) | Net assets (liabilities) at fair value through profit or loss, category other income      
Net assets (liabilities) [abstract]      
Total gains and losses in the period recognised in the income statement, assets (liabilities) net 3 0  
Trading portfolio liabilities | Recurring fair value measurement | Significant unobservable inputs (Level 3)      
Financial liabilities      
Beginning balance, financial liabilities (395) (368)  
Purchases, fair value measurement, liabilities (46) (24)  
Sales, fair value measurement, liabilities 28 17  
Issues, fair value measurement, liabilities 0 0  
Settlements, fair value measurement, liabilities 0 0  
Total gains or losses recognised in OCI, liabilities 0 0  
Transfers into Level 3 of fair value hierarchy, liabilities (57) (34)  
Transfers out of Level 3 of fair value hierarchy, liabilities 9 6  
Ending balance, financial liabilities (424) (385)  
Trading portfolio liabilities | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial liabilities at fair value through profit or loss, category trading      
Financial liabilities      
Total gains and losses in the period recognised in the income statement, liabilities 37 18  
Trading portfolio liabilities | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial liabilities at fair value through profit or loss, category other income      
Financial liabilities      
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 | Significant unobservable inputs (Level 3)      
Financial liabilities      
Beginning balance, financial liabilities (3,258) (1,222)  
Purchases, fair value measurement, liabilities 0 (6)  
Sales, fair value measurement, liabilities 91 28  
Issues, fair value measurement, liabilities (617) (627)  
Settlements, fair value measurement, liabilities 31 16  
Total gains or losses recognised in OCI, liabilities 0 0  
Transfers into Level 3 of fair value hierarchy, liabilities (179) (881)  
Transfers out of Level 3 of fair value hierarchy, liabilities 996 248  
Ending balance, financial liabilities (2,848) (2,492)  
Financial liabilities designated at fair value | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial liabilities at fair value through profit or loss, category trading      
Financial liabilities      
Total gains and losses in the period recognised in the income statement, liabilities 88 (27)  
Financial liabilities designated at fair value | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial liabilities at fair value through profit or loss, category other income      
Financial liabilities      
Total gains and losses in the period recognised in the income statement, liabilities 0 (21)  
Trading portfolio assets | Recurring fair value measurement | Significant unobservable inputs (Level 3)      
Financial assets      
Beginning balance, financial assets 10,115 6,509  
Purchases, fair value measurement, assets 4,125 3,113  
Sales, fair value measurement, assets (3,524) (1,007)  
Issues, fair value measurement, assets 0 0  
Settlements, fair value measurement, assets (1,147) (714)  
Total gains or losses recognised in OCI, assets 0 0  
Transfers into Level 3 of fair value hierarchy, assets 439 1,046  
Transfers out of Level 3 of fair value hierarchy, assets (265) (214)  
Ending balance, financial assets 9,879 8,726  
Trading portfolio assets | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category trading      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets 136 (7)  
Trading portfolio assets | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category other income      
Financial assets      
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 | Significant unobservable inputs (Level 3)      
Financial assets      
Beginning balance, financial assets 8,424 8,249  
Purchases, fair value measurement, assets 2,469 2,804  
Sales, fair value measurement, assets (1,200) (1,484)  
Issues, fair value measurement, assets 0 0  
Settlements, fair value measurement, assets (573) (380)  
Total gains or losses recognised in OCI, assets 0 0  
Transfers into Level 3 of fair value hierarchy, assets 63 291  
Transfers out of Level 3 of fair value hierarchy, assets (285) (118)  
Ending balance, financial assets 8,831 9,517  
Financial assets at fair value through the income statement | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category trading      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets (75) (19)  
Financial assets at fair value through the income statement | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category other income      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets 8 174  
Financial assets at fair value through other comprehensive income | Recurring fair value measurement | Significant unobservable inputs (Level 3)      
Financial assets      
Beginning balance, financial assets 3,739 1,078  
Purchases, fair value measurement, assets 566 1,854  
Sales, fair value measurement, assets (1,447) (42)  
Issues, fair value measurement, assets 0 0  
Settlements, fair value measurement, assets (6) 0  
Total gains or losses recognised in OCI, assets 0 0  
Transfers into Level 3 of fair value hierarchy, assets 307 0  
Transfers out of Level 3 of fair value hierarchy, assets (12) (448)  
Ending balance, financial assets 3,178 2,454  
Financial assets at fair value through other comprehensive income | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category trading      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets 2 1  
Financial assets at fair value through other comprehensive income | Recurring fair value measurement | Significant unobservable inputs (Level 3) | Financial assets at fair value through profit or loss, category other income      
Financial assets      
Total gains and losses in the period recognised in the income statement, assets £ 29 £ 11