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Pensions and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
 
We have both funded and unfunded defined benefit pension plans covering principally salaried employees. We also provide specified health care and life insurance benefits to eligible retired employees; these plans can be amended or terminated at our option.  Under our self-insured retiree health care plan, for those participants who are not Medicare-eligible, certain health care expenses are covered for retired employees and their dependents, reduced by any deductibles, coinsurance, and, in some cases, coverage provided under other group insurance policies.  Those participants who are Medicare-eligible are not covered under the self-insured retiree health care plan, but instead are provided with an employer-funded health reimbursement account which can be used for reimbursement of health insurance premiums or eligible out-of-pocket medical expenses.
Pension and postretirement benefit cost components for the second quarter and first six months were as follows:
   Other Postretirement
 Pension BenefitsBenefits
 Second Quarter
 2020201920202019
 ($ in millions)
Service cost$10  $8  $2  $1  
Interest cost18  23  3  5  
Expected return on plan assets(47) (44) (3) (3) 
Amortization of net losses13  11  —  —  
Amortization of prior service benefit—  —  (7) (6) 
Net benefit$(6) $(2) $(5) $(3) 

   Other Postretirement
 Pension BenefitsBenefits
 First Six Months
 2020201920202019
 ($ in millions)
Service cost$20  $17  $3  $3  
Interest cost37  46  6  9  
Expected return on plan assets(95) (89) (6) (7) 
Amortization of net losses26  22  —  —  
Amortization of prior service benefit—  —  (13) (12) 
Net benefit$(12) $(4) $(10) $(7) 
The service cost component of defined benefit pension cost and postretirement benefit cost are reported within “Compensation and benefits” and all other components of net benefit cost are presented in “Other income – net” on the Consolidated Statements of Income.