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Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic benefit cost for our retirement plans and postretirement plans for the periods ended June 30 are as follows: 

(in millions)Three MonthsSix Months
2023202220232022
Service cost$$$$
Interest cost19 12 37 25 
Expected return on assets(25)(22)(50)(44)
Amortization of prior service credit / actuarial loss— 
Net periodic benefit cost$(5)$(6)$(11)$(12)