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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three and six months ended June 30, 2022 and 2021 were as follows:

Three Months EndedSix Months Ended
June 30,June 30,
PensionOther Postretirement BenefitsPensionOther Postretirement Benefits
In millions20222021202220212022202120222021
Components of net periodic benefit cost:
Service cost$12 $14 $$$24 $27 $$
Interest cost12 10 25 20 
Expected return on plan assets(25)(26)(7)(6)(52)(51)(13)(13)
Amortization of actuarial loss (gain)13 (1)— 13 26 (2)— 
Amortization of prior service cost— — — — — — 
Total net periodic benefit cost$$12 $(3)$(2)$10 $23 $(5)$(4)