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INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2021 | Sep. 27, 2020 | Sep. 26, 2021 | Sep. 27, 2020
Segment Reporting Information [Line Items] |  |  |  |
Non-service FAS pension (expense) income | $ (1,572) | $ 54 | $ (1,385) | $ 164
Net FAS/CAS pension adjustment | (1,081) | 523 | 84 | 1,571
Unallocated items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Less: CAS pension cost | 517 | 494 | 1,549 | 1,483
FAS pension service cost | (26) | (25) | (80) | (76)
FAS/CAS operating adjustment | 491 | 469 | 1,469 | 1,407
Qualified defined benefit pension plans |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
FAS pension (expense) income | 1,598 | (29) | 1,465 | (88)
FAS pension service cost | (26) | (25) | (80) | (76)
Qualified defined benefit pension plans | Qualified Plan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
FAS pension (expense) income | $ (1,598) | $ 29 | $ (1,465) | $ 88

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- Definition The difference between the service cost component of U.S. GAAP FAS pension expense and total pension costs recoverable on U.S. Government contracts as determined in accordance with U.S. Government cost accounting standards + References No definition available. + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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