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TAX EXPENSE - Schedule of Income Tax Charges (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income tax [Abstract]      
Tax (expense) credit attributable to policyholders £ (163) £ 4 £ (148)
Shareholder tax (expense) credit (854) 157 (1,239)
Tax (expense) credit £ (1,017) £ 161 £ (1,387)