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RETIREMENT BENEFITS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2024 | Jun. 30, 2023 | Jun. 28, 2024 | Jun. 30, 2023
Pension |  |  |  |
Operating |  |  |  |
Service cost | $ 9 | $ 6 | $ 17 | $ 12
Non-operating |  |  |  |
Interest cost | 98 | 91 | 197 | 183
Expected return on plan assets | (165) | (152) | (330) | (305)
Amortization of net actuarial gain | (1) | (3) | (2) | (5)
Amortization of prior service (credit) cost | (6) | (6) | (13) | (13)
Non-service cost periodic benefit income | (74) | (70) | (148) | (140)
Net periodic benefit income | (65) | (64) | (131) | (128)
Other Benefits |  |  |  |
Operating |  |  |  |
Service cost | 1 | 1 | 1 | 1
Non-operating |  |  |  |
Interest cost | 2 | 2 | 5 | 5
Expected return on plan assets | (5) | (5) | (10) | (10)
Amortization of net actuarial gain | (5) | (5) | (9) | (10)
Amortization of prior service (credit) cost | 1 | 1 | 1 | 1
Non-service cost periodic benefit income | (7) | (7) | (13) | (14)
Net periodic benefit income | $ (6) | $ (6) | $ (12) | $ (13)

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