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Pension and Other Postretirement Benefits - Schedule of Projected and Changes in Benefit Obligations (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
GBP (£)
Projected Benefit Obligations        
Actuarial (gain)/loss $ 22      
Plan Assets        
Employer contributions | £       £ 196
Other Postretirement Benefits        
Projected Benefit Obligations        
Benefit obligations at beginning of period 108 $ 137    
Service cost 0 1 $ 1  
Interest cost 6 4 4  
Actuarial (gain)/loss 0 (22)    
Benefits paid (11) (11)    
Foreign currency translation 4 (1)    
Benefit obligations at end of period 107 108 137  
U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 1,094 1,413    
Service cost 13 19 20  
Interest cost 54 31 25  
Plan participants' contributions 0 0    
Amendments 1 1    
Settlements 0 (9)    
Curtailments 0 (2)    
Special termination benefits 0 0    
Actuarial (gain)/loss 36 (266)    
Benefits paid (89) (93)    
Foreign currency translation 0 0    
Benefit obligations at end of period 1,109 1,094 1,413  
Plan Assets        
Balance at beginning of period 886 1,177    
Actual return on plan assets - gain/(loss) 81 (199)    
Employer contributions 2 10    
Plan participants' contributions 0 0    
Settlements 0 (9)    
Benefits paid (89) (93)    
Foreign currency translation 0 0    
Balance at end of period 880 886 1,177  
Funded status (229) (208)    
Accumulated benefit obligations at end of period 1,065 1,055    
Non-U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 387 513    
Service cost 7 9 13  
Interest cost 19 13 32  
Plan participants' contributions 2 2    
Amendments (2) 0    
Settlements (8) (9)    
Curtailments 0 0    
Special termination benefits 6 0    
Actuarial (gain)/loss 18 (95)    
Benefits paid (38) (30)    
Foreign currency translation 24 (16)    
Benefit obligations at end of period 415 387 513  
Plan Assets        
Balance at beginning of period 381 529    
Actual return on plan assets - gain/(loss) 33 (22)    
Employer contributions 17      
Employer contributions   (63)    
Plan participants' contributions 2 2    
Settlements (7) (7)    
Benefits paid (38) (31)    
Foreign currency translation 24 (27)    
Balance at end of period 412 381 $ 529  
Funded status (3) (6)    
Accumulated benefit obligations at end of period $ 389 $ 361