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POSTRETIREMENT BENEFIT PLANS
 3 Months Ended
Mar. 28, 2021
Retirement Benefits [Abstract]  
POSTRETIREMENT BENEFIT PLANS POSTRETIREMENT BENEFIT PLANS
Our pretax net periodic benefit income related to our qualified defined benefit pension plans and retiree medical and life insurance plans consisted of the following (in millions):
 Quarters Ended
 March 28,
2021		March 29,
2020
Qualified defined benefit pension plans
Service cost$27 $25 
Interest cost 311 385 
Expected return on plan assets (569)(566)
Recognized net actuarial losses 252 212 
Amortization of prior service credits (87)(86)
Total net periodic benefit income$(66)$(30)
Retiree medical and life insurance plans
Service cost$3 $3 
Interest cost 13 18 
Expected return on plan assets (35)(32)
Recognized net actuarial losses — (1)
Amortization of prior service costs 9 10 
Total net periodic benefit income$(10)$(2)
We record the service cost component of net periodic benefit income as part of cost of sales and the non-service cost components of net periodic benefit cost as part of other non-operating income, net in the consolidated statements of earnings.
The recognized net actuarial losses and amortization of prior service credits or costs in the table above, along with similar costs related to our other postretirement benefit plans ($4 million for the quarter ended March 28, 2021 and $5 million for the quarter ended March 29, 2020) were reclassified from accumulated other comprehensive loss (AOCL) and recorded as a component of net periodic benefit income for the periods presented. These costs totaled $178 million ($140 million, net of tax) during the quarter ended March 28, 2021, and $140 million ($110 million, net of tax) during the quarter ended March 29, 2020 and were recorded on our consolidated statements of comprehensive income as an increase to other comprehensive income.
The required funding of our qualified defined benefit pension plans is determined in accordance with the Employee Retirement Income Security Act of 1974 (ERISA), as amended by the Pension Protection Act of 2006 (PPA), along with consideration of CAS and Internal Revenue Code rules. There were no contributions to our qualified defined benefit pension plans during the quarters ended March 28, 2021 and March 29, 2020.