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Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 02, 2020 | Sep. 27, 2019 | Oct. 02, 2020 | Sep. 27, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,463 | $ 4,431 | $ 13,534 | $ 8,024
Integrated Mission Systems | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,372 | 1,292 | 4,073 | 1,317
Integrated Mission Systems | Transferred over time | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,097 | 1,071 | 3,240 | 1,086
Integrated Mission Systems | Transferred over time | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 275 | 221 | 833 | 231
Integrated Mission Systems | Transferred over time | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,041 | 1,010 | 3,064 | 1,035
Integrated Mission Systems | Transferred over time | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 331 | 282 | 1,009 | 282
Integrated Mission Systems | Transferred over time | Prime contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 910 | 882 | 2,717 | 894
Integrated Mission Systems | Transferred over time | Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 462 | 410 | 1,356 | 423
Space and Airborne Systems | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,249 | 1,173 | 3,690 | 3,148
Space and Airborne Systems | Transferred over time | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,067 | 1,018 | 3,124 | 2,750
Space and Airborne Systems | Transferred over time | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 182 | 155 | 566 | 398
Space and Airborne Systems | Transferred over time | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 703 | 702 | 2,075 | 1,834
Space and Airborne Systems | Transferred over time | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 546 | 471 | 1,615 | 1,314
Space and Airborne Systems | Transferred over time | Prime contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 674 | 705 | 2,006 | 1,867
Space and Airborne Systems | Transferred over time | Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 575 | 468 | 1,684 | 1,281
Communication Systems | Transferred at point in time and over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,094 | 1,032 | 3,300 | 2,221
Communication Systems | Transferred at point in time and over time | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 749 | 721 | 2,427 | 1,423
Communication Systems | Transferred at point in time and over time | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 345 | 311 | 873 | 798
Communication Systems | Transferred at point in time and over time | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 935 | 875 | 2,804 |
Communication Systems | Transferred at point in time and over time | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 159 | 157 | 496 |
Communication Systems | Transferred at point in time and over time | Prime contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 759 | 679 | 2,248 |
Communication Systems | Transferred at point in time and over time | Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 335 | 353 | 1,052 |
Aviation Systems | Transferred at point in time and over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 792 | 948 | 2,603 | 1,278
Aviation Systems | Transferred at point in time and over time | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 687 | 724 | 2,132 | 1,045
Aviation Systems | Transferred at point in time and over time | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 105 | 224 | 471 | 233
Aviation Systems | Transferred at point in time and over time | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 646 | 784 | 2,114 | 1,070
Aviation Systems | Transferred at point in time and over time | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 146 | 164 | 489 | 208
Aviation Systems | Transferred at point in time and over time | Prime contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 511 | 584 | 1,689 | 904
Aviation Systems | Transferred at point in time and over time | Subcontractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 281 | $ 364 | $ 914 | $ 374

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