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Acquisitions and Divestitures, Divestitures, Goodwill and Intangible Assets - Changes In Amount of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2017
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] $ 11,955 $ 11,914  
Change in reporting unit composition [2] 0    
Acquisitions/divestitures [3] 7,902 16  
Other [4] (119) 25  
Goodwill, end of period 19,738 [5] 11,955 [1]  
Aerospace      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 2,678 2,638  
Change in reporting unit composition [2] 0    
Acquisitions/divestitures [3] 149 0  
Other [4] (71) 40  
Goodwill, end of period 2,756 [5] 2,678 [1]  
Combat Systems      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 2,663 2,677  
Change in reporting unit composition [2] 0    
Acquisitions/divestitures [3] 0 0  
Other [4] (36) (14)  
Goodwill, end of period 2,627 [5] 2,663 [1]  
Information Systems and Technology      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 6,317 6,302  
Change in reporting unit composition [2] (6,317)    
Acquisitions/divestitures [3] 0 16  
Other [4] 0 (1)  
Goodwill, end of period 0 [5] 6,317 [1]  
Accumulated impairment loss   1,900 $ 1,900
Information Technology      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 0 0  
Change in reporting unit composition [2] 2,076    
Acquisitions/divestitures [3] 7,752 0  
Other [4] 0 0  
Goodwill, end of period 9,828 [5] 0 [1]  
Accumulated impairment loss 632    
Mission Systems      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 0 0  
Change in reporting unit composition [2] 4,241    
Acquisitions/divestitures [3] 1 0  
Other [4] (12) 0  
Goodwill, end of period 4,230 [5] 0 [1]  
Accumulated impairment loss 1,300    
Marine Systems      
Goodwill [Roll Forward]      
Goodwill, beginning of period [1] 297 297  
Change in reporting unit composition [2] 0    
Acquisitions/divestitures [3] 0 0  
Other [4] 0 0  
Goodwill, end of period $ 297 [5] $ 297 [1]  
[1] Goodwill in the Information Systems and Technology reporting unit is net of $1.9 billion of accumulated impairment losses.
[2] Concurrent with the acquisition of CSRA, we reorganized our Information Systems and Technology operating segment into the Information Technology and Mission Systems segments. See Note A for further discussion of the segment reorganization. This reorganization similarly changed the composition of our reporting units. Accordingly, goodwill of the Information Systems and Technology reporting unit was reassigned to the Information Technology and Mission Systems reporting units using a relative fair value allocation approach as of the date of the reorganization.
[3] Includes adjustments during the purchase price allocation period. Activity in the first quarter of 2018 also includes an allocation of goodwill associated with the sale of the commercial health products business discussed above.
[4] Consists primarily of adjustments for foreign currency translation.
[5] Goodwill in the Information Technology and Mission Systems reporting units is net of $632 and $1.3 billion of accumulated impairment losses, respectively.