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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
 9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMSThe 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)2023202220232022
Pension benefits
Service cost$7 $19 $20 $59 
Interest cost36 25 108 73 
Expected return on plan assets(44)(39)(131)(118)
Amortization of net losses and prior service costs1 10 3 33 
Net periodic pension cost$— $15 $— $47 
OPEB
Interest cost$2 $1 $6 $3 
Amortization of net loss and prior service credit(6)(3)(18)(9)
Net periodic OPEB cost (income)$(4)$(2)$(12)$(6)