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Leases - Lessor Leases - Nature of operating lease assets on the balance sheet (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Property, plant and equipment £ 4,230 £ 4,418
Operating lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Property, plant and equipment 526 600
Rental income from investment property 838 840
Transportation | Operating lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Property, plant and equipment 282 327
Cars and light commercial vehicles | Operating lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Property, plant and equipment 21 28
Other | Operating lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Property, plant and equipment 223 245
Investment properties | Operating lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Lease income £ 59 £ 60