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Operating expenses (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Salaries £ 2,295 £ 2,494 £ 2,477
Bonus awards 267 232 299
Temporary and contract costs 240 258 401
Social security costs 300 316 296
Pension costs 354 340 301
- defined benefit schemes 215 215 188
- defined contribution schemes 139 125 113
Other 220 238 202
Staff costs 3,676 3,878 [1] 3,976 [1]
Premises and equipment 1,133 1,222 [1] 1,258 [1]
UK bank levy 99 167 134
Depreciation and amortisation 923 913 1,218
Other administrative expenses 1,927 1,678 2,694
Administrative expenses 4,082 3,980 5,304
Operating expenses 7,758 7,858 [1] 9,280 [1]
Prior period rebate     31
Impairment loss of goodwill 85    
Planned reduction of property portfolio      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Premises and equipment 33 144 161
Depreciation, property, plant and equipment 58 107 287
Accelerated depreciation 41 71 40
Freehold premises | Planned reduction of property portfolio      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Premises and equipment 3 1 4
Depreciation, property, plant and equipment 10 21 250
Long leasehold property | Planned reduction of property portfolio      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Premises and equipment 30 143 157
Depreciation, property, plant and equipment £ 48 £ 86 £ 37
[1] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.