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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jul. 01, 2022 | Jun. 30, 2023 | Jul. 01, 2022
Pension |  |  |  |
Operating |  |  |  |
Service cost | $ 6 | $ 12 | $ 12 | $ 22
Non-operating |  |  |  |
Interest cost | 91 | 55 | 183 | 110
Expected return on plan assets | (152) | (156) | (305) | (312)
Amortization of net actuarial gain | (3) | 3 | (5) | 5
Amortization of prior service (credit) cost | (6) | (8) | (13) | (14)
Non-service cost periodic benefit income | (70) | (106) | (140) | (211)
Net periodic benefit income | (64) | (94) | (128) | (189)
Other Benefits |  |  |  |
Operating |  |  |  |
Service cost | 1 | 0 | 1 | 1
Non-operating |  |  |  |
Interest cost | 2 | 2 | 5 | 4
Expected return on plan assets | (5) | (6) | (10) | (11)
Amortization of net actuarial gain | (5) | (2) | (10) | (4)
Amortization of prior service (credit) cost | 1 | 1 | 1 | 1
Non-service cost periodic benefit income | (7) | (5) | (14) | (10)
Net periodic benefit income | $ (6) | $ (5) | $ (13) | $ (9)

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