Segment Information, Geographic Location (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 23, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 31, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Property, plant and equipment, net		$ 1,121				$ 1,097				$ 1,121	$ 1,097
Net sales		2,989	$ 2,505	$ 2,664	$ 2,353	2,871	$ 2,564	$ 2,543	$ 2,488	10,511	10,466	$ 10,986
U.S. Government Agencies [Member]
Segment Reporting Information [Line Items]
Net sales	[1]									7,649	7,291	7,464
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales										1,282	1,376	1,656
Foreign Governments [Member]
Segment Reporting Information [Line Items]
Net sales	[1]									1,580	1,799	1,866
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net		974				971				974	971
Net sales										8,199	7,908	8,051
Reportable Geographical Components [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Net sales										331	336	335
Reportable Geographical Components [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Net sales										254	321	254
Reportable Geographical Components [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Net sales										297	281	289
Reportable Geographical Components [Member] | South Korea [Member]
Segment Reporting Information [Line Items]
Net sales										127	207	226
Reportable Geographical Components [Member] | Saudi Arabia (Member)
Segment Reporting Information [Line Items]
Net sales										159	201	160
Reportable Geographical Components [Member] | Japan [Member]
Segment Reporting Information [Line Items]
Net sales										81	95	124
Reportable Geographical Components [Member] | France
Segment Reporting Information [Line Items]
Net sales										75	62	74
Reportable Geographical Components [Member] | Other [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net		$ 147				$ 126				147	126
Net sales										988	1,055	1,473
Reportable Geographical Components [Member] | Total International [Member]
Segment Reporting Information [Line Items]
Net sales										$ 2,312	$ 2,558	$ 2,935

[1] Includes sales for which the Company is the prime contractor as well as sales based on the ultimate end customer for which the Company is a subcontractor.