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Pension Plans and Other Post Employment Benefit Plans
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Pension and other Post Employment Benefits PENSION PLANS AND OTHER POST EMPLOYMENT BENEFITS
The following sets forth the components of the company's net periodic benefit (credit) cost for defined benefit pension plans and other post employment benefits ("OPEB"):
Three Months Ended September 30,Nine Months Ended September 30,
(In millions)2024202320242023
Defined Benefit Pension Plans:
Service cost$3 $3 $12 $13 
Interest cost162 171 488 518 
Expected return on plan assets(133)(151)(399)(454)
Amortization of prior service (benefit) cost— — (2)(2)
Settlement loss1 1 1 1 
Net periodic benefit (credit) cost$33 $24 $100 $76 
Other Post Employment Benefits:
Service cost$— $1 $— $1 
Interest cost11 12 31 36 
Amortization of unrecognized (gain) loss(3)(2)(9)(7)
Amortization of prior service (benefit) cost(1)(1)(1)(1)
Net periodic benefit (credit) cost$7 $10 $21 $29