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Other assets (Details)
€ in Millions, £ in Millions
 12 Months Ended
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
GBP (£)
Other assets      
Interests in associates (1) £ 716   £ 449
Property, plant and equipment 4,230   4,418
Pension schemes in net surplus (Note 5) 602   723
Prepayments 360   328
Accrued income 248   216
Tax recoverable 190   192
Deferred tax (Note 7) 1,195   901
Acceptances 225   272
Other 476   391
Other assets £ 8,242   7,890
Long leasehold property      
Other assets      
Estimated useful lives 50 years    
Long leasehold property | Maximum      
Other assets      
Estimated useful lives 15 years    
Long leasehold property | Minimum      
Other assets      
Estimated useful lives 10 years    
Other equipment | Maximum      
Other assets      
Estimated useful lives 15 years    
Other equipment | Minimum      
Other assets      
Estimated useful lives 4 years    
Computers equipment      
Other assets      
Estimated useful lives 5 years    
Business Growth Fund      
Other assets      
Interests in associates (1)   € 700 £ 442