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SIGNIFICANT ACCOUNTING POLICIES - Net Estimated at Completion ("EAC") Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Dec. 31, 2021 | Jan. 01, 2021 | Jun. 28, 2019
Change in Accounting Estimate [Line Items] |  |  |  |
Net EAC adjustments, before income taxes | $ 1,600 | $ 3,342 | $ 2,686 | $ 1,446
Contracts Accounted for under Percentage of Completion |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Net EAC adjustments, before income taxes | 137 | 304 | 400 | 17
Net EAC adjustments, net of income taxes | $ 103 | $ 228 | $ 300 | $ 13
Net EAC adjustments, net of income taxes, per diluted share (in dollars per share) | $ 0.46 | $ 1.12 | $ 1.39 | $ 0.10

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