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Post balance sheet events (Details) - Notice of redemption of instruments that can no longer be included as part of Tier 1 capital [Member]
£ in Millions, € in Billions
Mar. 31, 2022
GBP (£)
Mar. 08, 2022
EUR (€)
Mar. 02, 2022
GBP (£)
Feb. 01, 2022
GBP (£)
Perpetual Regulatory Tier One Security (ISIN US780097AH44)        
Post balance sheet events        
Notional amount       £ 1,200.0
Interest Rate       7.648%
Perpetual Regulatory Tier One Security (ISIN US780097AH44) | Forecast        
Post balance sheet events        
Redemption of subordinated liabilities     £ 67.5  
Fixed to Floating Rate notes due 8 March 2023 | Forecast        
Post balance sheet events        
Redemption of subordinated liabilities | €   € 1.5    
USD Series U Non-Cumulative Dollar Preference Shares (ISIN US39057AA62) | Forecast        
Post balance sheet events        
Redemption of preference shares £ 1,013.0