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Pension and Other Postretirement Benefits - Narrative (Details)
£ in Millions, $ in Millions
 12 Months Ended 24 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Employer contributions | £   £ 196          
Expected contributions to be repaid back         £ 127   $ 153
Cash contributions repaid $ 77       £ 101 $ 122  
Multiemployer plans, additional expense 5   $ 5 $ 5      
Actuarial gain (loss) 46            
Amounts of common stock included in plan assets     357       265
Total contributions 13   12 $ 13      
Pension Plan              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Expected contributions             $ 16
Pension Plan | U.S. Plans              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Employer contributions 10   2        
Actuarial gain (loss) 266   43        
Pension Plan | Non-U.S. Plans              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Employer contributions (63)   234        
Actuarial gain (loss) 95   (444)        
Other Postretirement Benefits              
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]              
Actuarial gain (loss) $ 22   $ 20