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Business Segments (Schedule of segment reporting information by segment) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Oct. 02, 2020
Sep. 27, 2019
Segment Reporting Information [Line Items]        
Revenues $ 3,242 $ 2,835 $ 9,045 $ 8,140
Operating income (loss) 258 249 699 651
Operating Segments | Defense Solutions        
Segment Reporting Information [Line Items]        
Revenues 1,951 1,594 5,413 4,645
Operating income (loss) 145 107 359 324
Operating Segments | Civil        
Segment Reporting Information [Line Items]        
Revenues 771 733 2,183 2,023
Operating income (loss) 54 43 191 157
Operating Segments | Health        
Segment Reporting Information [Line Items]        
Revenues 520 508 1,449 1,472
Operating income (loss) 75 63 149 169
Corporate        
Segment Reporting Information [Line Items]        
Operating income (loss) $ (16) $ 36 $ 0 $ 1