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Financial Instruments - classification - Offsetable assets and liabilities (Details) - GBP (£)
£ / shares in Units, £ in Millions
Dec. 31, 2023
Dec. 31, 2022
Instruments which can be offset    
IFRS offset £ 3,272 £ 3,381
Potential for offset not recognised by IFRS    
Par value per share £ 1.0769 £ 1.0769
Derivatives [Member]    
Potential for offset not recognised by IFRS    
Instruments outside netting arrangements £ 0  
Instruments which can be offset    
Gross 3,289 £ 2,429
IFRS offset 3,272 3,381
Balance sheet 6,561 5,810
Potential for offset not recognised by IFRS    
Cash collateral (5,496) (4,318)
Securities collateral (1,745) (3,386)
Net amount after the effect of netting arrangements and related collateral (680) (1,894)
Instruments outside netting arrangements (52) (312)
Financial assets (liabilities) 6,509 5,498
Trading reverse repos/repos    
Instruments which can be offset    
Gross (2,869) 1,845
IFRS offset 0  
Balance sheet (2,869) 1,845
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements 0  
Cash collateral 0  
Securities collateral 3,059 (1,646)
Net amount after the effect of netting arrangements and related collateral 190 199
Instruments outside netting arrangements (339) (4,048)
Financial assets (liabilities) (3,208) (2,203)
Non trading reverse repos / repos    
Instruments which can be offset    
Gross 13,872 8,653
IFRS offset 0  
Balance sheet 13,872 8,653
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements 0  
Cash collateral 0  
Securities collateral (13,872) (8,653)
Net amount after the effect of netting arrangements and related collateral 0  
Instruments outside netting arrangements 77 98
Financial assets (liabilities) 13,949 8,751
Derivatives [Member]    
Instruments which can be offset    
Gross 95,734 115,177
IFRS offset (23,869) (22,111)
Balance sheet 71,865 93,066
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (60,355) (77,365)
Cash collateral (6,788) (9,761)
Other financial collateral (1,663) (1,185)
Net amount after the effect of netting arrangements and related collateral 3,059 4,755
Instruments outside netting arrangements 530 981
Potential for offset not recognised by IFRS    
Financial liabilities 72,395 94,047
Trading repos    
Instruments which can be offset    
Gross 42,442 33,767
IFRS offset (16,257) (14,510)
Balance sheet 26,185 19,257
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (664) (2,445)
Cash collateral 0  
Other financial collateral (25,520) (16,812)
Net amount after the effect of netting arrangements and related collateral 1  
Instruments outside netting arrangements 717 4,483
Potential for offset not recognised by IFRS    
Financial liabilities 26,902 23,740
Non trading repos    
Instruments which can be offset    
Gross 23,605 16,977
IFRS offset (9,646) (5,702)
Balance sheet 13,959 11,275
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (5)  
Cash collateral 0  
Other financial collateral (13,954) (11,275)
Net amount after the effect of netting arrangements and related collateral 0  
Instruments outside netting arrangements 3  
Potential for offset not recognised by IFRS    
Financial liabilities 13,962 11,275
Trading liabilities    
Potential for offset not recognised by IFRS    
Financial liabilities 53,636 52,808
Trading reverse repos    
Instruments which can be offset    
Gross 39,573 35,612
IFRS offset (16,257) (14,510)
Balance sheet 23,316 21,102
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (664) (2,445)
Other financial collateral (22,461) (18,458)
Net amount after the effect of netting arrangements and related collateral 191 199
Instruments outside netting arrangements   435
Potential for offset not recognised by IFRS    
Cash collateral 0  
Instruments outside netting arrangements 378  
Potential for offset not recognised by IFRS    
Financial assets 23,694 21,537
Derivatives [Member]    
Instruments which can be offset    
Gross 99,023 117,606
IFRS offset (20,597) (18,730)
Balance sheet 78,426 98,876
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (60,355) (77,365)
Cash collateral (12,284) (14,079)
Other financial collateral (3,408) (4,571)
Net amount after the effect of netting arrangements and related collateral 2,379 2,861
Instruments outside netting arrangements 478 669
Potential for offset not recognised by IFRS    
Financial assets 78,904 99,545
Trading assets    
Potential for offset not recognised by IFRS    
Financial assets 45,551 45,577
Non trading reverse repos    
Instruments which can be offset    
Gross 37,477 25,630
IFRS offset (9,646) (5,702)
Balance sheet 27,831 19,928
Potential for offset not recognised by IFRS    
Effect of master netting agreement and similar agreements (5)  
Cash collateral 0  
Other financial collateral (27,826) (19,928)
Net amount after the effect of netting arrangements and related collateral 0  
Instruments outside netting arrangements 80 98
Potential for offset not recognised by IFRS    
Financial assets £ 27,911 £ 20,026