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Revenue - Revenue by Contract Type (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Revenue [Line Items]        
Total revenue $ 9,189 $ 9,220 $ 18,581 $ 18,609
Fixed-price        
Revenue [Line Items]        
Total revenue 5,950 6,222 12,027 12,624
Cost-reimbursement        
Revenue [Line Items]        
Total revenue 2,509 2,305 5,084 4,602
Time-and-materials        
Revenue [Line Items]        
Total revenue 730 693 1,470 1,383
Aerospace        
Revenue [Line Items]        
Total revenue 1,867 1,622 3,770 3,509
Aerospace | Fixed-price        
Revenue [Line Items]        
Total revenue 1,614 1,440 3,287 3,149
Aerospace | Cost-reimbursement        
Revenue [Line Items]        
Total revenue 0 0 0 0
Aerospace | Time-and-materials        
Revenue [Line Items]        
Total revenue 253 182 483 360
Marine Systems        
Revenue [Line Items]        
Total revenue 2,651 2,536 5,302 5,019
Marine Systems | Fixed-price        
Revenue [Line Items]        
Total revenue 1,609 1,810 3,210 3,594
Marine Systems | Cost-reimbursement        
Revenue [Line Items]        
Total revenue 1,042 726 2,092 1,425
Marine Systems | Time-and-materials        
Revenue [Line Items]        
Total revenue 0 0 0 0
Combat Systems        
Revenue [Line Items]        
Total revenue 1,666 1,899 3,341 3,719
Combat Systems | Fixed-price        
Revenue [Line Items]        
Total revenue 1,441 1,668 2,906 3,237
Combat Systems | Cost-reimbursement        
Revenue [Line Items]        
Total revenue 211 216 408 451
Combat Systems | Time-and-materials        
Revenue [Line Items]        
Total revenue 14 15 27 31
Technologies        
Revenue [Line Items]        
Total revenue 3,005 3,163 6,168 6,362
Technologies | Fixed-price        
Revenue [Line Items]        
Total revenue 1,286 1,304 2,624 2,644
Technologies | Cost-reimbursement        
Revenue [Line Items]        
Total revenue 1,256 1,363 2,584 2,726
Technologies | Time-and-materials        
Revenue [Line Items]        
Total revenue $ 463 $ 496 $ 960 $ 992