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Financial instruments - classification - Assets (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial instruments      
Assets £ 692,673 £ 720,053 £ 781,992
Assets of disposal groups 902 6,861  
Cash and balances at central banks      
Financial instruments      
Financial Assets 104,262 144,832  
Assets 104,262 144,832  
Trading assets      
Financial instruments      
Financial Assets 45,551 45,577  
Assets 45,551 45,577  
Derivatives      
Financial instruments      
Financial Assets 78,904 99,545  
Assets 78,904 99,545  
Net hedging derivative assets 114 143  
Settlement balances      
Financial instruments      
Financial Assets 7,231 2,572  
Assets 7,231 2,572  
Loans to banks - amortised cost      
Financial instruments      
Assets 6,914 7,139  
Items in course of collection from other banks 255 229  
Loans to customers - amortised cost      
Financial instruments      
Assets 381,433 366,340  
Other financial assets      
Financial instruments      
Financial Assets 51,102 30,895  
Assets 51,102 30,895  
Intangible assets other than goodwill      
Financial instruments      
Assets 7,614 7,116  
Other assets      
Financial instruments      
Assets 8,760 9,176  
Assets of Disposal Groups [Member]      
Financial instruments      
Assets 902 6,861  
Other assets      
Financial instruments      
Assets 17,276 23,153  
Other assets | Level 3      
Financial instruments      
Assets of disposal groups 841 5,397  
Other assets | Cash and balances at central banks      
Financial instruments      
Assets 0    
Other assets | Trading assets      
Financial instruments      
Assets 0    
Other assets | Derivatives      
Financial instruments      
Assets 0    
Other assets | Settlement balances      
Financial instruments      
Assets 0    
Other assets | Loans to banks - amortised cost      
Financial instruments      
Assets 0    
Other assets | Loans to customers - amortised cost      
Financial instruments      
Assets 0    
Other assets | Other financial assets      
Financial instruments      
Assets 0    
Other assets | Intangible assets other than goodwill      
Financial instruments      
Assets 7,614 7,116  
Other assets | Other assets      
Financial instruments      
Assets 8,760 9,176  
Other assets | Assets of Disposal Groups [Member]      
Financial instruments      
Assets 902 6,861  
MVFTPL      
Financial instruments      
Financial Assets 125,100 145,800  
Assets 125,158 145,909  
MVFTPL | Cash and balances at central banks      
Financial instruments      
Assets    
MVFTPL | Trading assets      
Financial instruments      
Assets 45,551 45,577  
MVFTPL | Derivatives      
Financial instruments      
Assets 78,904 99,545  
MVFTPL | Settlement balances      
Financial instruments      
Assets 0    
MVFTPL | Loans to banks - amortised cost      
Financial instruments      
Assets 0    
MVFTPL | Loans to customers - amortised cost      
Financial instruments      
Assets 0    
MVFTPL | Other financial assets      
Financial instruments      
Assets 703 787  
MVFTPL | Intangible assets other than goodwill      
Financial instruments      
Assets 0    
MVFTPL | Other assets      
Financial instruments      
Assets 0    
MVFTPL | Assets of Disposal Groups [Member]      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member]      
Financial instruments      
Assets 28,699 16,973  
Financial assets at fair value through other comprehensive income, category [member] | Cash and balances at central banks      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Trading assets      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Derivatives      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Settlement balances      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Loans to banks - amortised cost      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Loans to customers - amortised cost      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Other financial assets      
Financial instruments      
Assets 28,699 16,973  
Financial assets at fair value through other comprehensive income, category [member] | Intangible assets other than goodwill      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Other assets      
Financial instruments      
Assets 0    
Financial assets at fair value through other comprehensive income, category [member] | Assets of Disposal Groups [Member]      
Financial instruments      
Assets 0    
Amortised cost      
Financial instruments      
Assets 521,535 534,018  
Amortised cost | Cash and balances at central banks      
Financial instruments      
Assets 104,262 144,832  
Amortised cost | Trading assets      
Financial instruments      
Assets 0    
Amortised cost | Derivatives      
Financial instruments      
Assets 0    
Amortised cost | Settlement balances      
Financial instruments      
Assets 7,231 2,572  
Amortised cost | Loans to banks - amortised cost      
Financial instruments      
Assets 6,914 7,139  
Amortised cost | Loans to customers - amortised cost      
Financial instruments      
Assets 381,433 366,340  
Amortised cost | Other financial assets      
Financial instruments      
Assets 21,695 £ 13,135  
Amortised cost | Intangible assets other than goodwill      
Financial instruments      
Assets 0    
Amortised cost | Other assets      
Financial instruments      
Assets 0    
Amortised cost | Assets of Disposal Groups [Member]      
Financial instruments      
Assets 0    
DFV      
Financial instruments      
Assets 5    
DFV | Other financial assets      
Financial instruments      
Assets £ 5