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Leases - Lessor Leases - Undiscounted lease receipts from operating leases and investment properties (Details)
€ in Millions, £ in Millions
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
EUR (€)
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ £ 316   £ 393  
Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   € 594   € 554
Not later than one year [member]        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ 131   143  
Not later than one year [member] | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   63   67
After 1 year but within 2 years        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ 92   112  
After 1 year but within 2 years | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   62   127
2 to 3 years        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ 50   79  
2 to 3 years | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   58   54
3 to 4 years        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ 23   34  
3 to 4 years | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   56   76
4 to 5 years        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ 11   14  
4 to 5 years | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   51   88
After 5 years        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | £ £ 9   £ 11  
After 5 years | Investment properties | Operating lease assets        
Disclosure of maturity analysis of operating lease payments [line items]        
Amount receivable under operating leases | €   € 304   € 142