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Borrowings - Core Structural Borrowings (Details)
£ in Millions, $ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Core structural borrowings of shareholder-financed businesses            
Borrowings            
Borrowings $ 3,925   $ 3,933   $ 4,261 $ 6,127
US$750m 4.875% notes            
Borrowings            
Borrowings 750   750      
Notional amount $ 750   $ 750      
Borrowings, interest rate 4.875% 4.875% 4.875% 4.875%    
GBP435m 6.125% notes 2031            
Borrowings            
Borrowings $ 542   $ 551      
Notional amount | £   £ 435   £ 435    
Borrowings, interest rate 6.125% 6.125% 6.125% 6.125%    
US$1,000m 2.95% notes 2033            
Borrowings            
Borrowings $ 997   $ 996      
Notional amount $ 1,000   $ 1,000      
Borrowings, interest rate 2.95% 2.95% 2.95% 2.95%    
Senior debt: GBP250m 5.875% notes 2029            
Borrowings            
Borrowings $ 299   $ 301      
Notional amount | £   £ 250   £ 250    
Borrowings, interest rate 5.875% 5.875% 5.875% 5.875%    
Senior debt: US$1,000m 3.125% notes 2030            
Borrowings            
Borrowings $ 990   $ 988      
Notional amount $ 1,000   $ 1,000      
Borrowings, interest rate 3.125% 3.125% 3.125% 3.125%    
Senior debt; US$350m 3.625% notes 2032            
Borrowings            
Borrowings $ 347   $ 347      
Notional amount $ 350   $ 350      
Borrowings, interest rate 3.625% 3.625% 3.625% 3.625%