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Post-retirement Benefit Plans - Summary of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net periodic benefit cost:        
Net periodic benefit cost $ 5 $ 3 $ 13 $ 11
Domestic defined benefit pension plans        
Net periodic benefit cost:        
Service cost 1 1 2 2
Interest cost 2 1 4 3
Expected return on plan assets (1) (1) (4) (4)
Amortization of net actuarial loss 0   1 1
Net periodic benefit cost 2 1 3 2
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost 2 2 7 7
Interest cost 4 4 12 12
Expected return on plan assets (3) (4) (9) (10)
Net periodic benefit cost $ 3 $ 2 $ 10 $ 9