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Revenue - Revenue by Customer (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 02, 2017 | Apr. 03, 2016
Revenue [Line Items] |  |
Revenues | $ 7,441 | $ 7,476
Aerospace |  |
Revenue [Line Items] |  |
Revenues | 2,074 | 1,781
Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 1,287 | 1,245
Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 2,146 | 2,328
Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 1,934 | 2,122
U.S. Government - Department of Defense |  |
Revenue [Line Items] |  |
Revenues | 3,639 | 3,858
U.S. Government - Department of Defense | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 40 | 46
U.S. Government - Department of Defense | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 587 | 514
U.S. Government - Department of Defense | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 1,175 | 1,306
U.S. Government - Department of Defense | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 1,837 | 1,992
U.S. Government - Non Department of Defense |  |
Revenue [Line Items] |  |
Revenues | 689 | 740
U.S. Government - Non Department of Defense | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 0 | 0
U.S. Government - Non Department of Defense | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 24 | 20
U.S. Government - Non Department of Defense | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 665 | 718
U.S. Government - Non Department of Defense | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 0 | 2
U.S. Government - Foreign Military Sales |  |
Revenue [Line Items] |  |
Revenues | 187 | 169
U.S. Government - Foreign Military Sales | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 9 | 45
U.S. Government - Foreign Military Sales | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 108 | 75
U.S. Government - Foreign Military Sales | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 12 | 12
U.S. Government - Foreign Military Sales | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 58 | 37
U.S. Government |  |
Revenue [Line Items] |  |
Revenues | 4,515 | 4,767
U.S. Government | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 49 | 91
U.S. Government | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 719 | 609
U.S. Government | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 1,852 | 2,036
U.S. Government | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 1,895 | 2,031
U.S. Commercial |  |
Revenue [Line Items] |  |
Revenues | 1,119 | 1,200
U.S. Commercial | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 936 | 973
U.S. Commercial | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 61 | 55
U.S. Commercial | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 89 | 87
U.S. Commercial | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 33 | 85
Non U S Government |  |
Revenue [Line Items] |  |
Revenues | 687 | 790
Non U S Government | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 5 | 77
Non U S Government | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 502 | 547
Non U S Government | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 176 | 160
Non U S Government | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | 4 | 6
Non - U.S. Commercial |  |
Revenue [Line Items] |  |
Revenues | 1,120 | 719
Non - U.S. Commercial | Aerospace |  |
Revenue [Line Items] |  |
Revenues | 1,084 | 640
Non - U.S. Commercial | Combat Systems |  |
Revenue [Line Items] |  |
Revenues | 5 | 34
Non - U.S. Commercial | Information Systems and Technology |  |
Revenue [Line Items] |  |
Revenues | 29 | 45
Non - U.S. Commercial | Marine Systems |  |
Revenue [Line Items] |  |
Revenues | $ 2 | $ 0

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