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Insurance business - Schedule of net finance income (expense) from insurance, participating investment and reinsurance contracts (Details) - GBP (£)
£ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Disclosure of analysis of insurance revenue [line items]      
Net trading income £ 10,758 £ 11,888 £ 6,161
Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss (10,013) (11,187) (5,589)
Net finance expense from insurance, participating investment and reinsurance contracts (6,477) (7,915) (3,769)
Income (expense) from unit-linked and with-profit contracts, variable fee approach 6,951 6,419 3,781
Life      
Disclosure of analysis of insurance revenue [line items]      
Net finance expense from insurance, participating investment and reinsurance contracts (6,474) (7,948) (3,730)
Non-life      
Disclosure of analysis of insurance revenue [line items]      
Net finance expense from insurance, participating investment and reinsurance contracts (3) 33 (39)
Insurance contracts      
Disclosure of analysis of insurance revenue [line items]      
Net trading income 6,502 8,221 3,570
Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss (6,558) (7,964) (3,771)
Insurance contracts | Life      
Disclosure of analysis of insurance revenue [line items]      
Net trading income 6,482 8,214 3,542
Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss (6,555) (7,997) (3,732)
Insurance contracts | Non-life      
Disclosure of analysis of insurance revenue [line items]      
Net trading income 20 7 28
Insurance finance income (expenses) from insurance contracts issued recognised in profit or loss (3) 33 (39)
Reinsurance contracts held      
Disclosure of analysis of insurance revenue [line items]      
Net finance income from reinsurance contracts held 81 49 2
Reinsurance contracts held | Life      
Disclosure of analysis of insurance revenue [line items]      
Net finance income from reinsurance contracts held 81 49 2
Reinsurance contracts held | Non-life      
Disclosure of analysis of insurance revenue [line items]      
Net finance income from reinsurance contracts held £ 0 £ 0 £ 0