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Pension Plans and Other Post Employment Benefit Plans
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(In millions)2024202320242023
Defined Benefit Pension Plans:
Service cost$4 $5 $9 $10 
Interest cost163 173 326 347 
Expected return on plan assets(133)(151)(266)(303)
Amortization of prior service (benefit) cost(1)(1)(2)(2)
Net periodic benefit (credit) cost$33 $26 $67 $52 
Other Post Employment Benefits:
Interest cost$10 $12 $20 $24 
Amortization of unrecognized (gain) loss(3)(3)(6)(5)
Net periodic benefit (credit) cost$7 $9 $14 $19