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POSTRETIREMENT BENEFIT PLANS (Tables)
9 Months Ended
Sep. 24, 2023
Retirement Benefits [Abstract]  
Schedule of Pretax Net Periodic Benefit Cost The pretax FAS income (expense) related to our qualified defined benefit pension plans and retiree medical and life insurance plans consisted of the following (in millions):
 Quarters EndedNine Months Ended
 September 24,
2023
September 25,
2022
September 24,
2023
September 25,
2022
Qualified defined benefit pension plans
Operating:
Service cost$(17)$(20)$(49)$(68)
Non-operating:
Interest cost (364)(342)(1,094)(947)
Expected return on plan assets 430 425 1,291 1,430 
Amortization of actuarial losses (42)(62)(126)(363)
Amortization of prior service credits 87 90 261 270 
Pension settlement charge —  (1,470)
Non-service FAS pension income (expense)111 111 332 (1,080)
Total FAS pension income (expense)$94 $91 $283 $(1,148)
Retiree medical and life insurance plans
Operating:
Service cost$(1)$(3)$(4)$(7)
Non-operating:
Interest cost (17)(12)(51)(36)
Expected return on plan assets 25 34 77 102 
Amortization of actuarial gains7 12 23 35 
Amortization of prior service costs (2)(7)(7)(21)
Non-service FAS retiree medical and life income13 27 42 80 
Total FAS retiree medical and life income$12 $24 $38 $73