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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three months ended March 31, 2021 and 2020 were as follows:

Three Months Ended
March 31,
PensionOther Postretirement Benefits
In millions2021202020212020
Components of net periodic benefit cost:
Service cost$13 $14 $$
Interest cost10 15 
Expected return on plan assets(25)(28)(7)(6)
Amortization of actuarial loss (gain)13 12 — — 
Total net periodic benefit cost$11 $13 $(2)$—