v3.26.1
Pension and Postretirement Benefit Plans - Schedule of Components of Net Periodic Cost and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Postretirement Benefits    
Operating expense    
Service cost $ 1 $ 1
Non-operating expense    
Interest cost 3 3
Expected return on plan assets (2) (2)
Amortization of net actuarial loss 1 1
Non-operating 2 2
Total net periodic benefit cost (benefit) 3 3
United States | Qualified and Non-qualified Pension Benefits    
Operating expense    
Service cost 6 6
Non-operating expense    
Interest cost 23 24
Expected return on plan assets (32) (31)
Amortization of net actuarial loss 16 16
Non-operating 7 9
Total net periodic benefit cost (benefit) 13 15
International | Qualified and Non-qualified Pension Benefits    
Operating expense    
Service cost 4 5
Non-operating expense    
Interest cost 6 5
Expected return on plan assets (6) (6)
Amortization of net actuarial loss 0 0
Non-operating 0 (1)
Total net periodic benefit cost (benefit) $ 4 $ 4