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Tax - Schedule of Income Tax Charges (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of income tax [Abstract]      
Tax (expense) credit attributable to policyholders £ (137) £ 30 £ (54)
Shareholder tax expense (1,357) (2,015) (805)
Tax expense £ (1,494) £ (1,985) £ (859)