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Pension and Retiree Medical Benefits (Notes)
 3 Months Ended
Mar. 23, 2024
Pension and Retiree Medical Benefits [Abstract]  
Pension and Retiree Medical Benefits Pension and Retiree Medical Benefits
The components of net periodic benefit cost/(income) for pension and retiree medical plans are as follows:
 12 Weeks Ended
 PensionRetiree Medical
 U.S.International 
 3/23/20243/25/20233/23/20243/25/20233/23/20243/25/2023
Service cost$80 $76 $9 $8 $7 $6 
Other pension and retiree medical benefits income:
Interest cost135 137 27 25 7 8 
Expected return on plan assets(201)(197)(39)(35)(3)(3)
Amortization of prior service credits(6)(6)— — (1)(1)
Amortization of net losses/(gains)18 16 4 2 (6)(6)
Special termination benefits7 (1)— — — — 
Total other pension and retiree medical benefits income(47)(51)(8)(8)(3)(2)
Total$33 $25 $1 $— $4 $4 
We regularly evaluate opportunities to reduce risk and volatility associated with our pension and retiree medical plans.
In the 12 weeks ended March 23, 2024 and March 25, 2023, we made discretionary contributions of $150 million and $125 million, respectively, to our U.S. qualified defined benefit plans, and $27 million and $17 million, respectively, to our international defined benefit plans.