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Pension and Other Postretirement Benefits - Narrative (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Employer contributions | £       £ 196    
Cash contributions repaid £ 103 $ 131        
Multiemployer plans, additional expense   6 $ 5   $ 5  
Actuarial gain (loss)   (22)        
Amounts of common stock included in plan assets     265     $ 297
Expected contributions | £ £ 24          
Total contributions   $ 14 $ 13   $ 12  
Pension Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Expected contributions           $ 43