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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
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 $2 $2 $27 $27 $4 $4 
Interest cost10 15 2 4 20 30 5 8 
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 cost1 — — — 1 — — — 
Total net periodic benefit cost$12 $12 $(2)$— $23 $25 $(4)$— 

The service cost component of net periodic benefit cost is presented within Cost of revenue and Selling, administrative, and research and development expenses in the Statement of Income while the other components of net periodic benefit cost are presented within Other income (expense).

The Company expects to contribute approximately $28 million to its pension plans and $4 million to its other postretirement benefit plans in 2021. As of June 30, 2021, contributions of $18 million to pension plans and $2 million to other postretirement benefit plans have been made.