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Business Segments (Segment Reporting Information by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 4,132	$ 3,838	$ 8,107	$ 7,537
Total operating income	475	331	890	596
Corporate
Segment Reporting Information [Line Items]
Total operating income	(38)	(30)	(75)	(59)
National Security and Digital | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	1,813	1,791	3,606	3,548
Total operating income	183	172	358	317
Health & Civil | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	1,263	1,034	2,462	2,042
Total operating income	307	134	529	247
Commercial & International | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	561	547	1,070	1,036
Total operating income	(11)	34	23	47
Defense Systems | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	495	466	969	911
Total operating income	$ 34	$ 21	$ 55	$ 44

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