Segment Information, Geographic Location (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,771	$ 2,519	$ 2,583	$ 2,371	$ 2,574	$ 2,293	$ 2,385	$ 2,321	$ 10,244	$ 9,573	$ 9,210
Property, plant and equipment, net	1,169				1,110				1,169	1,110
U.S. Government Agencies [Member]
Segment Reporting Information [Line Items]
Net sales									7,144	6,697	6,399
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales									1,572	1,456	1,280
Foreign Governments [Member]
Segment Reporting Information [Line Items]
Net sales									1,528	1,420	1,531
Reportable Geographical Components [Member] | U.S. [Member]
Segment Reporting Information [Line Items]
Net sales									7,843	7,344	6,947
Property, plant and equipment, net	973				936				973	936
Reportable Geographical Components [Member] | Total International [Member]
Segment Reporting Information [Line Items]
Net sales									2,401	2,229	2,263
Reportable Geographical Components [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Net sales									312	280	297
Reportable Geographical Components [Member] | United Kingdom [Member]
Segment Reporting Information [Line Items]
Net sales									309	335	331
Reportable Geographical Components [Member] | Australia [Member]
Segment Reporting Information [Line Items]
Net sales									219	268	254
Reportable Geographical Components [Member] | China [Member]
Segment Reporting Information [Line Items]
Net sales									156	167	67
Reportable Geographical Components [Member] | Japan [Member]
Segment Reporting Information [Line Items]
Net sales									145	125	81
Reportable Geographical Components [Member] | Saudi Arabia [Member]
Segment Reporting Information [Line Items]
Net sales									128	58	159
Reportable Geographical Components [Member] | Turkey [Member]
Segment Reporting Information [Line Items]
Net sales									113	61	61
Reportable Geographical Components [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales									1,019	935	$ 1,013
Property, plant and equipment, net	$ 196				$ 174				$ 196	$ 174