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Pension and Postretirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension Benefits | U.S.    
Components of Net Periodic Benefit Cost    
Service cost $ 31 $ 29
Interest cost 32 28
Expected return on plan assets (38) (38)
Amortization of net actuarial loss (gain) 4 3
Settlements 2 1
Net periodic benefit (credit) cost 31 23
Pension Benefits | Int’l.    
Components of Net Periodic Benefit Cost    
Service cost 3 3
Interest cost 8 8
Expected return on plan assets (11) (11)
Amortization of net actuarial loss (gain) 0 0
Settlements 0 0
Net periodic benefit (credit) cost 0 0
Other Benefits    
Components of Net Periodic Benefit Cost    
Service cost 0 1
Interest cost 2 2
Expected return on plan assets 0 0
Amortization of net actuarial loss (gain) (1) (1)
Settlements 0 0
Net periodic benefit (credit) cost $ 1 $ 2