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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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+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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