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Retirement Plans and Other Retiree Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Components of net periodic benefit cost    
ERISA litigation matter $ 0 $ 65
Other Retiree Benefits    
Components of net periodic benefit cost    
Service cost 2 2
Interest cost 9 9
Expected return on plan assets 0 0
Amortization of actuarial loss (gain) (4) (5)
Net periodic benefit cost 7 6
ERISA litigation matter 0 0
Other postretirement charges 5 0
Total pension cost 12 6
United States | Pension Benefits    
Components of net periodic benefit cost    
Service cost 0 0
Interest cost 22 24
Expected return on plan assets (18) (18)
Amortization of actuarial loss (gain) 9 9
Net periodic benefit cost 13 15
ERISA litigation matter 0 50
Other postretirement charges 0 0
Total pension cost 13 65
International | Pension Benefits    
Components of net periodic benefit cost    
Service cost 5 4
Interest cost 9 8
Expected return on plan assets (7) (7)
Amortization of actuarial loss (gain) 1 2
Net periodic benefit cost 8 7
ERISA litigation matter 0 0
Other postretirement charges 0 0
Total pension cost $ 8 $ 7