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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three months ended March 31, 2022 and 2021 were as follows:

Three Months Ended
March 31,
PensionOther Postretirement Benefits
In millions2022202120222021
Components of net periodic benefit cost:
Service cost$12 $13 $$
Interest cost13 10 
Expected return on plan assets(27)(25)(6)(7)
Amortization of actuarial loss (gain)13 (1)— 
Total net periodic benefit cost$$11 $(2)$(2)