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POSTRETIREMENT BENEFIT PLANS
 9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
POSTRETIREMENT BENEFIT PLANS
NOTE 13. 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 12 to the consolidated financial statements of our Annual Report on Form 10-K for the year ended December 31, 2021 for further information.

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 September 30Nine months ended September 30
2022202120222021
Service cost for benefits earned$48 $57 $146 $179 
Prior service cost amortization1 8 4 22 
Expected return on plan assets(785)(763)(2,356)(2,288)
Interest cost on benefit obligations518 488 1,551 1,464 
Net actuarial loss amortization355 871 1,067 2,613 
Benefit plans cost$137 $661 $412 $1,990 

Principal retiree benefit plans income was $53 million and $43 million for the three months ended September 30, 2022 and 2021, and $158 million and $125 million for the nine months ended September 30, 2022 and 2021, respectively. Other pension plans income was $94 million and $57 million for the three months ended September 30, 2022 and 2021, and $310 million and $44 million for the nine months ended September 30, 2022 and 2021, respectively, which includes a curtailment loss of $77 million in 2021 resulting from freezing the UK pension plans.
We also have a defined contribution plan for eligible U.S. employees that provides employer contributions which were $109 million and $99 million for the three months ended September 30, 2022 and 2021, and $333 million and $321 million for the nine months ended September 30, 2022 and 2021, respectively.