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Revenue - Revenue by Customer (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2021 | Jun. 28, 2020 | Jul. 04, 2021 | Jun. 28, 2020
Revenue [Line Items] |  |  |  |
Revenue | $ 9,220 | $ 9,264 | $ 18,609 | $ 18,013
U.S. Government - DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 5,276 | 5,067 | 10,417 | 9,912
U.S. Government - Non-DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,298 | 1,151 | 2,550 | 2,339
U.S. Government - Foreign Military Sales (FMS) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 127 | 215 | 303 | 384
Total U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 6,701 | 6,433 | 13,270 | 12,635
U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,061 | 1,211 | 2,042 | 2,160
Non-U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 936 | 785 | 1,989 | 1,624
Non-U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 522 | 835 | 1,308 | 1,594
Aerospace |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,622 | 1,974 | 3,509 | 3,665
Aerospace | U.S. Government - DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 72 | 52 | 130 | 213
Aerospace | U.S. Government - Non-DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Aerospace | U.S. Government - Foreign Military Sales (FMS) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 18 | 52 | 37 | 70
Aerospace | Total U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 90 | 104 | 167 | 283
Aerospace | U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 982 | 1,032 | 1,839 | 1,812
Aerospace | Non-U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 50 | 53 | 240 | 74
Aerospace | Non-U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 500 | 785 | 1,263 | 1,496
Marine Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,536 | 2,471 | 5,019 | 4,717
Marine Systems | U.S. Government - DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,492 | 2,390 | 4,912 | 4,549
Marine Systems | U.S. Government - Non-DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 0 | 1 | 4 | 2
Marine Systems | U.S. Government - Foreign Military Sales (FMS) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 41 | 51 | 97 | 100
Marine Systems | Total U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,533 | 2,442 | 5,013 | 4,651
Marine Systems | U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1 | 27 | 2 | 60
Marine Systems | Non-U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 0 | 2 | 2 | 5
Marine Systems | Non-U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2 | 0 | 2 | 1
Combat Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,899 | 1,754 | 3,719 | 3,462
Combat Systems | U.S. Government - DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 954 | 930 | 1,870 | 1,818
Combat Systems | U.S. Government - Non-DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3 | 3 | 5 | 6
Combat Systems | U.S. Government - Foreign Military Sales (FMS) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 62 | 99 | 149 | 188
Combat Systems | Total U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,019 | 1,032 | 2,024 | 2,012
Combat Systems | U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 42 | 86 | 108 | 141
Combat Systems | Non-U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 822 | 618 | 1,554 | 1,281
Combat Systems | Non-U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 16 | 18 | 33 | 28
Technologies |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,163 | 3,065 | 6,362 | 6,169
Technologies | U.S. Government - DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,758 | 1,695 | 3,505 | 3,332
Technologies | U.S. Government - Non-DoD |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,295 | 1,147 | 2,541 | 2,331
Technologies | U.S. Government - Foreign Military Sales (FMS) |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 6 | 13 | 20 | 26
Technologies | Total U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 3,059 | 2,855 | 6,066 | 5,689
Technologies | U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 36 | 66 | 93 | 147
Technologies | Non-U.S. government |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 64 | 112 | 193 | 264
Technologies | Non-U.S. commercial |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | $ 4 | $ 32 | $ 10 | $ 69

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