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FINANCIAL RISK MANAGEMENT - Schedule of Mortgage Lending (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers [1] £ 448,567 £ 440,200
Mortgage offers made | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 308,344 294,806
Mortgage offers made | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 836 1,024
Mortgage offers made | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 273,629 251,418
Mortgage offers made | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 48 104
Mortgage offers made | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 21,798 29,018
Mortgage offers made | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 394 468
Mortgage offers made | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 1,940 1,859
Mortgage offers made | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 184 191
Mortgage offers made | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 10,977 12,511
Mortgage offers made | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 210 261
Mortgage offers made | Less than 70 per cent | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 249,185 221,476
Mortgage offers made | Less than 70 per cent | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 486 409
Mortgage offers made | Less than 70 per cent | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 217,830 185,548
Mortgage offers made | Less than 70 per cent | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 31 42
Mortgage offers made | Less than 70 per cent | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 19,766 24,330
Mortgage offers made | Less than 70 per cent | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 247 202
Mortgage offers made | Less than 70 per cent | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 1,717 1,547
Mortgage offers made | Less than 70 per cent | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 98 77
Mortgage offers made | Less than 70 per cent | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 9,872 10,051
Mortgage offers made | Less than 70 per cent | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 110 88
Mortgage offers made | 70 per cent to 80 per cent | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 45,146 48,510
Mortgage offers made | 70 per cent to 80 per cent | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 155 269
Mortgage offers made | 70 per cent to 80 per cent | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 42,808 43,656
Mortgage offers made | 70 per cent to 80 per cent | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 11 29
Mortgage offers made | 70 per cent to 80 per cent | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 1,632 3,364
Mortgage offers made | 70 per cent to 80 per cent | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 80 136
Mortgage offers made | 70 per cent to 80 per cent | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 134 187
Mortgage offers made | 70 per cent to 80 per cent | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 38 46
Mortgage offers made | 70 per cent to 80 per cent | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 572 1,303
Mortgage offers made | 70 per cent to 80 per cent | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 26 58
Mortgage offers made | 80 per cent to 90 per cent | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 12,576 23,061
Mortgage offers made | 80 per cent to 90 per cent | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 72 172
Mortgage offers made | 80 per cent to 90 per cent | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 12,087 21,508
Mortgage offers made | 80 per cent to 90 per cent | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 5 28
Mortgage offers made | 80 per cent to 90 per cent | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 253 1,009
Mortgage offers made | 80 per cent to 90 per cent | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 28 79
Mortgage offers made | 80 per cent to 90 per cent | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 52 74
Mortgage offers made | 80 per cent to 90 per cent | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 23 31
Mortgage offers made | 80 per cent to 90 per cent | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 184 470
Mortgage offers made | 80 per cent to 90 per cent | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 16 34
Mortgage offers made | 90 per cent to 100 per cent | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 974 892
Mortgage offers made | 90 per cent to 100 per cent | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 33 49
Mortgage offers made | 90 per cent to 100 per cent | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 779 555
Mortgage offers made | 90 per cent to 100 per cent | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 0 3
Mortgage offers made | 90 per cent to 100 per cent | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 46 126
Mortgage offers made | 90 per cent to 100 per cent | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 10 16
Mortgage offers made | 90 per cent to 100 per cent | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 14 21
Mortgage offers made | 90 per cent to 100 per cent | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 7 11
Mortgage offers made | 90 per cent to 100 per cent | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 135 190
Mortgage offers made | 90 per cent to 100 per cent | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 16 19
Mortgage offers made | Greater than 100 per cent | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 463 867
Mortgage offers made | Greater than 100 per cent | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 90 125
Mortgage offers made | Greater than 100 per cent | Stage 1 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 125 151
Mortgage offers made | Greater than 100 per cent | Stage 1 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 1 2
Mortgage offers made | Greater than 100 per cent | Stage 2 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 101 189
Mortgage offers made | Greater than 100 per cent | Stage 2 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 29 35
Mortgage offers made | Greater than 100 per cent | Stage 3 | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 23 30
Mortgage offers made | Greater than 100 per cent | Stage 3 | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 18 26
Mortgage offers made | Greater than 100 per cent | POCI | Drawn balance    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers 214 497
Mortgage offers made | Greater than 100 per cent | POCI | Expected credit losses on drawn balances    
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Mortgage Lending [Line Items]    
Loans and advances to customers £ 42 £ 62
[1] See note 1 regarding changes to presentation.