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POSTRETIREMENT BENEFIT PLANS
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
POSTRETIREMENT BENEFIT PLANS
NOTE 14. POSTRETIREMENT BENEFIT PLANS. We sponsor a number of pension and retiree health and life insurance benefit plans that we present in three categories, principal pension plans, other pension plans and principal retiree benefit plans. Please refer to Note 13 to the consolidated financial statements of our Annual Report on Form 10-K for the year ended December 31, 2020 for a discussion of our postretirement benefit plans.

The components of benefit plans cost other than the service cost are included in the caption Non-operating benefit costs in our consolidated Statement of Earnings (Loss).
PRINCIPAL PENSION PLANSThree months ended June 30Six months ended June 30
2021202020212020
Service cost for benefits earned$58 $192 $122 $345 
Prior service cost amortization37 14 74 
Expected return on plan assets(762)(748)(1,525)(1,496)
Interest cost on benefit obligations490 589 976 1,176 
Net actuarial loss amortization878 851 1,742 1,699 
Benefit plans cost$671 $921 $1,329 $1,798 

Principal retiree benefit plans income was $42 million and $22 million for the three months ended June 30, 2021 and 2020, and $82 million and $54 million for the six months ended June 30, 2021 and 2020, respectively. Other pension plans cost was $37 million and $2 million for the three months ended June 30, 2021 and 2020 and $13 million and $9 million for the six months ended June 30, 2021 and 2020, respectively, which includes a curtailment loss of $77 million in 2021 resulting from freezing the UK pension plans, as announced on June 10, 2021.

We also have a defined contribution plan for eligible U.S. employees that provides employer contributions. Defined contribution plan costs were $113 million and $87 million for the three months ended June 30, 2021 and 2020 and $221 million and $182 million for the six months ended June 30, 2021 and 2020, respectively.