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Pension and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
Pension and other postretirement benefit costs for the three and six months ended June 30, 2021 and 2020 were as follows:

Three Months EndedSix Months Ended
June 30,June 30,
PensionOther Postretirement BenefitsPensionOther Postretirement Benefits
In millions20212020202120202021202020212020
Components of net periodic benefit cost:
Service cost$14 $13 $$$27 $27 $$
Interest cost10 15 20 30 
Expected return on plan assets(26)(28)(6)(6)(51)(56)(13)(12)
Amortization of actuarial loss (gain)13 12 — — 26 24 — — 
Amortization of prior service cost— — — — — — 
Total net periodic benefit cost$12 $12 $(2)$— $23 $25 $(4)$—