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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
Three Months Ended September 30,Nine Months Ended September 30,
(in millions)2025202420252024
Pension benefits
Service cost$$$$13 
Interest cost34 33 102 123 
Expected return on plan assets(44)(43)(132)(160)
Amortization of net losses and prior service costs11 
Net periodic pension cost (benefit)$(6)$(2)$(18)$(13)
OPEB
Interest cost$$$$
Amortization of net loss and prior service credit(4)(5)(12)(14)
Net periodic OPEB cost (income)$(2)$(3)$(6)$(8)