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Other disclosures - Risk Management and Principal Risks - Analysis of equity sensitivity (audited) (Details) - Interest rate risk - +/- 25bps - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Increase (decrease) in profit for the year due to reasonable possibly increase £ 25 £ 71
Increase (decrease) in profit for the year due to reasonable possibly decrease (73) (158)
Increase (decrease) in equity for the year due to reasonable possible increase (757) (921)
Increase (decrease) in equity for the year due to reasonable possible decrease 727 800
Taxation effects on the above    
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Increase (decrease) in profit for the year due to reasonable possibly increase (5) (15)
Increase (decrease) in profit for the year due to reasonable possibly decrease 15 33
Increase (decrease) in equity for the year due to reasonable possible increase 288 361
Increase (decrease) in equity for the year due to reasonable possible decrease (291) (342)
Retained earnings    
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Increase (decrease) in profit for the year due to reasonable possibly increase 20 56
Increase (decrease) in profit for the year due to reasonable possibly decrease £ (58) £ (125)
Percentage of reasonably possible increase 0.30% 0.80%
Percentage of reasonably possible decrease (1.00%) (1.70%)
Increase (decrease) in equity for the year due to reasonable possible increase £ 20 £ 56
Increase (decrease) in equity for the year due to reasonable possible decrease (58) (125)
Fair value through other comprehensive income reserve    
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Increase (decrease) in equity for the year due to reasonable possible increase (291) (479)
Increase (decrease) in equity for the year due to reasonable possible decrease 302 408
Cash flow hedge reserve    
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Increase (decrease) in equity for the year due to reasonable possible increase (774) (859)
Increase (decrease) in equity for the year due to reasonable possible decrease £ 774 £ 859
Equity attributable to owners of parent    
Disclosure of sensitivity analysis to changes in risk exposures that arise from contracts within scope of IFRS 17 [line items]    
Percentage of reasonably possible increase 1.00% 1.20%
Percentage of reasonably possible decrease (1.10%) (1.30%)