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Revenue - Revenue by Customer (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
Combat Systems
Revenue [Line Items]
Revenue	1,534	1,414	2,974	2,701
Information Technology
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
Marine Systems
Revenue [Line Items]
Revenue	2,168	2,079	4,202	4,013
U.S. Government - Department of Defense
Revenue [Line Items]
Revenue	4,597	3,810	8,370	7,438
U.S. Government - Department of Defense | Aerospace
Revenue [Line Items]
Revenue	89	32	130	72
U.S. Government - Department of Defense | Combat Systems
Revenue [Line Items]
Revenue	660	660	1,267	1,269
U.S. Government - Department of Defense | Information Technology
Revenue [Line Items]
Revenue	1,052	424	1,485	845
U.S. Government - Department of Defense | Mission Systems
Revenue [Line Items]
Revenue	764	678	1,506	1,399
U.S. Government - Department of Defense | Marine Systems
Revenue [Line Items]
Revenue	2,032	2,016	3,982	3,853
U.S. Government - Non Department of Defense
Revenue [Line Items]
Revenue	1,445	699	2,201	1,399
U.S. Government - Non Department of Defense | Aerospace
Revenue [Line Items]
Revenue	0	0	0	0
U.S. Government - Non Department of Defense | Combat Systems
Revenue [Line Items]
Revenue	3	1	4	3
U.S. Government - Non Department of Defense | Information Technology
Revenue [Line Items]
Revenue	1,311	551	1,948	1,118
U.S. Government - Non Department of Defense | Mission Systems
Revenue [Line Items]
Revenue	130	147	248	278
U.S. Government - Non Department of Defense | Marine Systems
Revenue [Line Items]
Revenue	1	0	1	0
U.S. Government - Foreign Military Sales
Revenue [Line Items]
Revenue	162	153	291	340
U.S. Government - Foreign Military Sales | Aerospace
Revenue [Line Items]
Revenue	19	9	35	18
U.S. Government - Foreign Military Sales | Combat Systems
Revenue [Line Items]
Revenue	83	83	152	191
U.S. Government - Foreign Military Sales | Information Technology
Revenue [Line Items]
Revenue	7	6	15	11
U.S. Government - Foreign Military Sales | Mission Systems
Revenue [Line Items]
Revenue	14	15	21	22
U.S. Government - Foreign Military Sales | Marine Systems
Revenue [Line Items]
Revenue	39	40	68	98
U.S. Government
Revenue [Line Items]
Revenue	6,204	4,662	10,862	9,177
U.S. Government | Aerospace
Revenue [Line Items]
Revenue	108	41	165	90
U.S. Government | Combat Systems
Revenue [Line Items]
Revenue	746	744	1,423	1,463
U.S. Government | Information Technology
Revenue [Line Items]
Revenue	2,370	981	3,448	1,974
U.S. Government | Mission Systems
Revenue [Line Items]
Revenue	908	840	1,775	1,699
U.S. Government | Marine Systems
Revenue [Line Items]
Revenue	2,072	2,056	4,051	3,951
U.S. Commercial
Revenue [Line Items]
Revenue	1,143	1,027	2,163	2,146
U.S. Commercial | Aerospace
Revenue [Line Items]
Revenue	917	877	1,759	1,813
U.S. Commercial | Combat Systems
Revenue [Line Items]
Revenue	58	42	116	103
U.S. Commercial | Information Technology
Revenue [Line Items]
Revenue	41	65	81	126
U.S. Commercial | Mission Systems
Revenue [Line Items]
Revenue	36	26	63	54
U.S. Commercial | Marine Systems
Revenue [Line Items]
Revenue	91	17	144	50
Non U S Government
Revenue [Line Items]
Revenue	1,051	822	1,952	1,512
Non U S Government | Aerospace
Revenue [Line Items]
Revenue	143	64	153	69
Non U S Government | Combat Systems
Revenue [Line Items]
Revenue	712	594	1,409	1,096
Non U S Government | Information Technology
Revenue [Line Items]
Revenue	31	6	51	10
Non U S Government | Mission Systems
Revenue [Line Items]
Revenue	161	154	333	329
Non U S Government | Marine Systems
Revenue [Line Items]
Revenue	4	4	6	8
Non - U.S. Commercial
Revenue [Line Items]
Revenue	788	1,164	1,744	2,281
Non - U.S. Commercial | Aerospace
Revenue [Line Items]
Revenue	727	1,096	1,643	2,180
Non - U.S. Commercial | Combat Systems
Revenue [Line Items]
Revenue	18	34	26	39
Non - U.S. Commercial | Information Technology
Revenue [Line Items]
Revenue	0	0	0	0
Non - U.S. Commercial | Mission Systems
Revenue [Line Items]
Revenue	42	32	74	58
Non - U.S. Commercial | Marine Systems
Revenue [Line Items]
Revenue	$ 1	$ 2	$ 1	$ 4

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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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