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Pension and Other Postretirement Benefits - Components of net periodic benefit (cost) (Details) - Pension Plan - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
U.S. Plans    
Benefit plans    
Service cost $ 1 $ 1
Interest cost 3 3
Expected return on plan assets (4) (4)
Net periodic cost 0 0
Non-U.S. Plans    
Benefit plans    
Service cost 1 1
Interest cost 2 2
Expected return on plan assets (2) (2)
Net periodic cost $ 1 $ 1