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Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 9,555 | $ 9,186 | $ 18,816 | $ 16,721
Aerospace |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 2,136 | 1,895 | 4,376 | 3,720
Aerospace | Aircraft manufacturing and completions |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 1,597 | 1,362 | 3,288 | 2,728
Aerospace | Aircraft services |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 537 | 531 | 1,044 | 982
Aerospace | Pre-owned aircraft |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 2 | 2 | 44 | 10
Combat Systems |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 1,659 | 1,534 | 3,295 | 2,974
Combat Systems | Military vehicles |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 1,090 | 990 | 2,224 | 1,946
Combat Systems | Weapons systems, armament and munitions |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 461 | 443 | 862 | 826
Combat Systems | Engineering and other services |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 108 | 101 | 209 | 202
Information Technology |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 2,158 | 2,442 | 4,327 | 3,580
Information Technology | Information technology services |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 2,158 | 2,442 | 4,327 | 3,580
Mission Systems |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 1,277 | 1,147 | 2,435 | 2,245
Mission Systems | C4ISR solutions |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue | [1] | 1,277 | 1,147 | 2,435 | 2,245
Marine Systems |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 2,325 | 2,168 | 4,383 | 4,202
Marine Systems | Nuclear-powered submarines |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 1,538 | 1,438 | 2,915 | 2,734
Marine Systems | Surface ships |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | 528 | 473 | 974 | 956
Marine Systems | Repair and other services |  |  |  |  |
Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 259 | $ 257 | $ 494 | $ 512
[1] |

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