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Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2022
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
2022202120222021
Service cost$$$$
Interest cost12 10 25 21 
Expected return on assets(22)(26)(44)(52)
Amortization of prior service credit / actuarial loss
Net periodic benefit cost$(6)$(10)$(12)$(20)