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Financial Instruments - classification - IBOR reform (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets £ 781,992 £ 799,491
Financial Liabilities 740,189 755,667
IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Loan commitments 7,437 42,702
Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Loan commitments 55 682
GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Loan commitments 1,016 25,616
EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Loan commitments   7,176
USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Loan commitments 6,366 9,228
Subject to conversion provisions under IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 22,056  
Financial Liabilities 426  
Loan commitments 15,785  
Derivatives [Member] | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 1,155,600 5,424,600
Derivatives [Member] | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   289,600
Derivatives [Member] | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 3,600 1,407,500
Derivatives [Member] | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   2,358,700
Derivatives [Member] | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 1,152,000 1,368,800
Derivatives [Member] | Subject to conversion provisions under IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 557,700  
Currency swaps | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   2,200
Currency swaps | Other IBOR | GBP    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 500 300
Currency swaps | Other IBOR | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 400 300
Currency swaps | Other IBOR | USD    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 25,300 47,400
Currency swaps | Other IBOR | Euro    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   1,000
Currency swaps | GBP LIBOR | GBP    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 8,700 5,200
Currency swaps | GBP LIBOR | USD    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 91,700 98,500
Currency swaps | GBP LIBOR | Euro    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 100 2,300
Currency swaps | EUR IBOR | GBP    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   2,900
Currency swaps | EUR IBOR | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   700
Currency swaps | EUR IBOR | USD    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   85,800
Currency swaps | EUR IBOR | Euro    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 100 5,100
Currency swaps | USD IBOR | GBP    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 8,200 2,000
Currency swaps | USD IBOR | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 400 1,200
Currency swaps | USD IBOR | USD    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 117,000 231,700
Currency swaps | USD IBOR | Euro    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   1,800
Basis swaps | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   10,000
Basis swaps | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   97,000
Basis swaps | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   49,000
Basis swaps | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   81,000
Trading assets. | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 152 484
Trading assets. | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   1
Trading assets. | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 62 75
Trading assets. | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   348
Trading assets. | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 90 60
Loans to banks - amortised cost. | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 11 206
Loans to banks - amortised cost. | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   23
Loans to banks - amortised cost. | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   101
Loans to banks - amortised cost. | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 11 82
Loans to customers - amortised cost. | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 9,620 51,849
Loans to customers - amortised cost. | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 267 234
Loans to customers - amortised cost. | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 4,788 40,299
Loans to customers - amortised cost. | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   4,950
Loans to customers - amortised cost. | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 4,565 6,366
Other financial assets    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 46,145 55,148
Other financial assets | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 1,632 3,591
Other financial assets | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 864 2,918
Other financial assets | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets   370
Other financial assets | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Assets 768 303
Bank deposits | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 37 474
Bank deposits | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   107
Bank deposits | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 37 367
Customer deposits. | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   4
Customer deposits. | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   4
Trading liabilities. | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 197 739
Trading liabilities. | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   2
Trading liabilities. | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 31 54
Trading liabilities. | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   269
Trading liabilities. | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 166 414
Financial liabilities (other)    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 49,326 45,811
Financial liabilities (other) | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 9,544 18,396
Financial liabilities (other) | Other IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 131 196
Financial liabilities (other) | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 2,390 2,492
Financial liabilities (other) | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   5,902
Financial liabilities (other) | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 7,023 9,806
Subordinated Liabilities | IBOR reform    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities 90 1,296
Subordinated Liabilities | GBP LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   8
Subordinated Liabilities | EUR IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities   438
Subordinated Liabilities | USD IBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Financial Liabilities £ 90 £ 850