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POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 25, 2023 | Jun. 30, 2024 | Jun. 25, 2023
Qualified defined benefit pension plans |  |  |  |
Operating: |  |  |  |
Service cost | $ (15) | $ (16) | $ (30) | $ (32)
Non-operating: |  |  |  |
Interest cost | (350) | (365) | (699) | (730)
Expected return on plan assets | 393 | 431 | 786 | 861
Amortization of actuarial losses | (65) | (42) | (130) | (84)
Amortization of prior service credits | 37 | 87 | 74 | 174
Non-service FAS pension/retiree medical and life income | 15 | 111 | 31 | 221
Total FAS pension income | 0 | 95 | 1 | 189
Retiree medical and life insurance plans |  |  |  |
Operating: |  |  |  |
Service cost | (1) | (2) | (2) | (3)
Non-operating: |  |  |  |
Interest cost | (16) | (17) | (32) | (34)
Expected return on plan assets | 27 | 26 | 54 | 52
Amortization of actuarial losses | 9 | 8 | 18 | 16
Amortization of prior service credits | (1) | (2) | (2) | (5)
Non-service FAS pension/retiree medical and life income | 19 | 15 | 38 | 29
Total FAS pension income | $ 18 | $ 13 | $ 36 | $ 26

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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