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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
 9 Months Ended
Sep. 30, 2024
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)2024202320242023
Pension benefits
Service cost$4 $6 $13 $18 
Interest cost33 45 123 137 
Expected return on plan assets(43)(57)(160)(166)
Amortization of net losses and prior service costs4 1 11 4 
Net periodic pension cost$(2)$(5)$(13)$(7)
OPEB
Interest cost$2 $2 $6 $6 
Amortization of net loss and prior service credit(5)(6)(14)(18)
Net periodic OPEB cost (income)$(3)$(4)$(8)$(12)