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FINANCIAL RISK MANAGEMENT - Schedule of Debt Securities Held at Amortised Cost (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Asset-backed securities:    
Debt securities £ 9,926 £ 6,835
Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 5,660 3,065
Corporate and other debt securities 4,007 3,571
Debt securities 9,926 6,835
Investment grade | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 5,658 3,047
Corporate and other debt securities 3,993 3,558
Other | Sub-investment grade    
Asset-backed securities:    
Debt securities 0 18
Other | Not rated    
Asset-backed securities:    
Debt securities 16 13
Other | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 2 18
Corporate and other debt securities 14 13
Mortgage-backed securities | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 3,712 1,457
Government securities 268 202
Mortgage-backed securities | Investment grade | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 3,712 1,457
Government securities 268 202
Mortgage-backed securities | Other | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 0 0
Government securities 0 0
Other asset-backed securities | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 1,948 1,608
Other asset-backed securities | Investment grade | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 1,946 1,590
Other asset-backed securities | Other | Loans and receivables, category    
Asset-backed securities:    
Asset-backed securities 2 18
Corporate and other debt securities | Loans and receivables, category    
Asset-backed securities:    
Gross exposure 9,935 6,838
Allowance for impairment losses (9) (3)
Corporate and other debt securities | Investment grade | Loans and receivables, category    
Asset-backed securities:    
Gross exposure 9,919 6,807
Corporate and other debt securities | Other | Loans and receivables, category    
Asset-backed securities:    
Gross exposure £ 16 £ 31