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Leases - Lessee Leases - Amounts recognised in consolidated financial statements (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Interest payable £ (38) £ (42)
Depreciation (167) (209)
Rental expense on short term leases   (1)
Income from subleasing right-of-use assets 4 4
Right of use assets 733 955
Additions to right of use assets 70 80
Lease liabilities (1,263) (1,698)
Total cash outflow for leases 195 220
Payments of principal amount, lease liabilities 164 179
Impairment of right of use assets 52 89
Plant and equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right of use assets 9 8
Accumulated depreciation £ 4 £ 2