v3.25.4
Other assets - Schedule of Other Assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2025
Jun. 11, 2025
Dec. 31, 2024
Disposal group      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Reinsurance contract assets £ 0 £ 4,900 £ 5,059
Disposal group assets:      
Deferred tax assets 0 9 13
Goodwill 0 £ 50 50
Insurance contract assets 113   0
Reinsurance contract assets 401   422
Investment in joint ventures and associates 445   542
Property, plant and equipment: 14,916   13,397
Prepayments 1,792   1,634
Deferred tax assets 3,990   5,005
Non-current assets or disposal groups classified as held for sale 0   5,122
Other assets 2,988   3,671
Total other assets 20,655   24,788
Reinsurance contract liabilities      
Disposal group assets:      
Increase (decrease) in insurance contracts liability (asset) 5,080    
Aggregate continuing and discontinued operations [member]      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Reinsurance contract assets     5,481
Investment property      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Property, plant and equipment: 3,917   3,281
Premises      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Property, plant and equipment: 1,126   1,100
Equipment      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Property, plant and equipment: 901   879
Operating lease assets      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Property, plant and equipment: 8,213   7,265
Right-of-use assets (note 25)      
PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items]      
Property, plant and equipment: £ 759   £ 872