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OTHER - Changes in Estimates (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 29, 2020 satellite | Sep. 27, 2020 USD ($) $ / shares | Sep. 29, 2019 USD ($) $ / shares | Sep. 27, 2020 USD ($) satellite $ / shares | Sep. 29, 2019 USD ($) $ / shares | Dec. 31, 2019 satellite
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Performance obligation satisfied in previous period |  | $ 487 | $ 495 | $ 1,500 | $ 1,700 |
Number of satellites launched or to be launched | satellite | 1 |  |  | 3 |  | 2
Space |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Number of commercial satellite programs with performance issues | satellite |  |  |  |  |  | 2
Ground Based Radar |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Cumulative losses on development |  | 250 |  | $ 250 |  |
EADGE-T |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Cumulative losses on development |  | 260 |  | 260 |  |
LM 2100 Project |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Cumulative losses on development |  | 410 |  | 410 |  |
Warrior Capability Sustainment Program |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Cumulative losses on development |  | 140 |  | 140 |  |
Contracts Accounted for under Percentage of Completion |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Increase in operating profit due to profit rate adjustments |  | 415 | 480 | 1,400 | 1,500 |
Increase in net earnings due to profit rate adjustments |  | $ 328 | $ 379 | $ 1,100 | $ 1,200 |
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares |  | $ 1.17 | $ 1.33 | $ 3.82 | $ 4.07 |

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