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Financial instruments - Summary of fair value hedges (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Hedged borrowings    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (2,587) £ (2,773)
$700m bond and $700m interest rate swaps maturing 2023    
Disclosure Of Detailed Information About Hedged Items    
Principal amount   £ (579)
Fixed rate   3.50%
Floating rate basis   USD LIBOR+0.8%
$700m bond and $700m interest rate swaps maturing 2023 | US dollar LIBOR    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate   0.80%
€500m bond and €500m interest rate swaps maturing 2024    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (433) £ (443)
Fixed rate 1.00%  
Floating rate basis Euribor+0.7%  
€500m bond and €500m interest rate swaps maturing 2024 | Euribor    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate 0.70%  
€600m bond and €600m/$669.3m cross-currency interest rate swaps maturing 2025    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (524) (553)
Fixed rate 1.30%  
Floating rate basis USD SOFR+1.5%  
€600m bond and €600m/$669.3m cross-currency interest rate swaps maturing 2025 | US dollar SOFR    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate 1.50%  
$200m bond and $200m interest rate swaps maturing 2027    
Disclosure Of Detailed Information About Hedged Items    
Principal amount   £ (165)
Fixed rate   7.20%
Floating rate basis   USD SOFR+6.0%
$200m bond and $200m interest rate swaps maturing 2027 | US dollar SOFR    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate   6.00%
$750m bond and $750m interest rate swaps maturing 2030    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (588) £ (620)
Fixed rate 3.00%  
Floating rate basis USD SOFR+1.8%  
$750m bond and $750m interest rate swaps maturing 2030 | US dollar SOFR    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate 1.80%  
€750m bond and €750m interest rate swaps maturing 2031    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (650)  
Fixed rate 3.80%  
Floating rate basis Euribor+0.9%  
€750m bond and €750m interest rate swaps maturing 2031 | Euribor    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate 0.90%  
$500m bond and $500m interest rate swaps maturing 2032    
Disclosure Of Detailed Information About Hedged Items    
Principal amount £ (392) £ (413)
Fixed rate 4.80%  
Floating rate basis USD SOFR+2.0%  
$500m bond and $500m interest rate swaps maturing 2032 | US dollar SOFR    
Disclosure Of Detailed Information About Hedged Items    
Adjustment to floating rate 2.00%