XML 59 R49.htm IDEA: XBRL DOCUMENT v3.25.3
Pension and Other Postretirement Benefits - Components 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
Pension benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 18 18 56 56
Expected return on plan assets (17) (17) (50) (52)
Recognized net actuarial (gain) loss 8 9 23 25
Net periodic cost (benefit) 10 11 31 31
Other postretirement benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 1 1 3 4
Recognized net actuarial (gain) loss (2) (1) (6) (2)
Amortization of prior service benefit (2) (2) (7) (7)
Net periodic cost (benefit) $ (3) $ (2) $ (10) $ (5)