Business Segments (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 3,699	$ 3,494
Total operating income	265	271
Corporate
Segment Reporting Information [Line Items]
Total operating income	(29)	(23)
Defense Solutions
Segment Reporting Information [Line Items]
Total revenues	2,112	2,049
Defense Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total operating income	147	133
Civil
Segment Reporting Information [Line Items]
Total revenues	877	795
Civil | Operating Segments
Segment Reporting Information [Line Items]
Total operating income	40	43
Health
Segment Reporting Information [Line Items]
Total revenues	710	650
Health | Operating Segments
Segment Reporting Information [Line Items]
Total operating income	$ 107	$ 118