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Financial Instruments - classification - IBOR reform (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
IBOR reform    
Financial instruments by type of interest rate    
Loan commitments   £ 7,437
Other IBOR    
Financial instruments by type of interest rate    
Loan commitments   55
GBP LIBOR    
Financial instruments by type of interest rate    
Loan commitments   1,016
USD IBOR    
Financial instruments by type of interest rate    
Loan commitments   6,366
Bank deposits    
Financial instruments by type of interest rate    
Financial Liabilities £ 20,441 26,279
Bank deposits | IBOR reform    
Financial instruments by type of interest rate    
Financial Liabilities   37
Bank deposits | USD IBOR    
Financial instruments by type of interest rate    
Financial Liabilities   37
Trading liabilities. | IBOR reform    
Financial instruments by type of interest rate    
Financial Liabilities   197
Trading liabilities. | GBP LIBOR    
Financial instruments by type of interest rate    
Financial Liabilities   31
Trading liabilities. | USD IBOR    
Financial instruments by type of interest rate    
Financial Liabilities   166
Other financial liabilities    
Financial instruments by type of interest rate    
Financial Liabilities 49,107 49,326
Other financial liabilities | IBOR reform    
Financial instruments by type of interest rate    
Financial Liabilities   9,544
Other financial liabilities | Other IBOR    
Financial instruments by type of interest rate    
Financial Liabilities   131
Other financial liabilities | GBP LIBOR    
Financial instruments by type of interest rate    
Financial Liabilities   2,390
Other financial liabilities | USD IBOR    
Financial instruments by type of interest rate    
Financial Liabilities   7,023
Subordinated Liabilities | IBOR reform    
Financial instruments by type of interest rate    
Financial Liabilities   90
Subordinated Liabilities | USD IBOR    
Financial instruments by type of interest rate    
Financial Liabilities   90
Trading assets. | IBOR reform    
Financial instruments by type of interest rate    
Financial Assets   152
Trading assets. | GBP LIBOR    
Financial instruments by type of interest rate    
Financial Assets   62
Trading assets. | USD IBOR    
Financial instruments by type of interest rate    
Financial Assets   90
Loans to banks - amortised cost. | IBOR reform    
Financial instruments by type of interest rate    
Financial Assets   11
Loans to banks - amortised cost. | USD IBOR    
Financial instruments by type of interest rate    
Financial Assets   11
Loans to customers - amortised cost. | IBOR reform    
Financial instruments by type of interest rate    
Financial Assets   9,620
Loans to customers - amortised cost. | Other IBOR    
Financial instruments by type of interest rate    
Financial Assets   267
Loans to customers - amortised cost. | GBP LIBOR    
Financial instruments by type of interest rate    
Financial Assets   4,788
Loans to customers - amortised cost. | USD IBOR    
Financial instruments by type of interest rate    
Financial Assets   4,565
Other financial assets    
Financial instruments by type of interest rate    
Financial Assets £ 30,895 46,145
Other financial assets | IBOR reform    
Financial instruments by type of interest rate    
Financial Assets   1,632
Other financial assets | GBP LIBOR    
Financial instruments by type of interest rate    
Financial Assets   864
Other financial assets | USD IBOR    
Financial instruments by type of interest rate    
Financial Assets   768
Derivatives [Member] | IBOR reform    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   1,156,000
Derivatives [Member] | GBP LIBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   4,000
Derivatives [Member] | USD IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   1,152,000
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | Other IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   500
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | GBP LIBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   8,700
Currency swaps of GBP LIBOR with USD IBOR and Other IBOR | USD IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   8,200
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | Other IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   25,300
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | GBP LIBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   91,700
Currency swaps of USD IBOR with GBP LIBOR and Other IBOR | USD IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   117,000
Currency swaps of Other IBOR with USD IBOR | Other IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   400
Currency swaps of Other IBOR with USD IBOR | GBP LIBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   100
Currency swaps of Other IBOR with USD IBOR | EUR IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   100
Currency swaps of Other IBOR with USD IBOR | USD IBOR    
Financial instruments by type of interest rate    
Derivatives notional (£bn)   £ 400