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Revenue - Revenue by Products and Services (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Revenue [Line Items] |  |  |  |
Revenue | $ 9,186 | $ 7,675 | $ 16,721 | $ 15,116
Aerospace |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,895 | 2,078 | 3,720 | 4,152
Aerospace | Aircraft manufacturing and completions |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,362 | 1,600 | 2,728 | 3,229
Aerospace | Aircraft services |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 531 | 445 | 982 | 880
Aerospace | Pre-owned aircraft |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2 | 33 | 10 | 43
Combat Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,534 | 1,414 | 2,974 | 2,701
Combat Systems | Wheeled combat and tactical vehicles |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 644 | 566 | 1,269 | 1,126
Combat Systems | Weapons systems, armament and munitions |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 443 | 409 | 826 | 755
Combat Systems | Tanks and tracked vehicles |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 346 | 278 | 677 | 525
Combat Systems | Engineering and other services |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 101 | 161 | 202 | 295
Information Technology |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,442 | 1,052 | 3,580 | 2,110
Information Technology | Information technology services |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,442 | 1,052 | 3,580 | 2,110
Mission Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,147 | 1,052 | 2,245 | 2,140
Mission Systems | Platform systems and sensors |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 383 | 393 | 774 | 783
Mission Systems | Intelligence, surveillance and reconnaissance systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 372 | 333 | 749 | 662
Mission Systems | Communication systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 392 | 326 | 722 | 695
Marine Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 2,168 | 2,079 | 4,202 | 4,013
Marine Systems | Nuclear - powered submarines |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,438 | 1,342 | 2,734 | 2,546
Marine Systems | Surface combatants |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 276 | 254 | 541 | 501
Marine Systems | Auxiliary and commercial ships |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 197 | 155 | 415 | 298
Marine Systems | Repair and other services |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | $ 257 | $ 328 | $ 512 | $ 668

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