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Benefit Plans - Postretirement Benefit Plan Obligation (Details) - Postretirement Benefit Plans - U.S. Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Beginning balance $ 233 $ 317
Service cost 1 2
Interest cost 12 9
Benefits paid (16) (15)
Plan amendments (22) 0
Currency 2 (5)
Actuarial losses/(gains) (5) (75)
Ending balance 205 233
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning balance 0 0
Employer Contributions 76 0
Benefit Payments (12) 0
Actual Return on Assets 6 0
Ending balance $ 70 $ 0