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Acquisitions and Divestitures, Goodwill and Intangible Assets - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 03, 2018
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
business
Apr. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
business
Business Acquisition [Line Items]        
Amortization expense   $ 70 $ 20  
Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Payments to acquire businesses, gross       $ 400
Number of businesses acquired | business       5
CSRA        
Business Acquisition [Line Items]        
Payments to acquire businesses, gross $ 9,749      
Estimated acquired intangible assets 2,066      
Goodwill expected to be deductible for tax purposes 490      
CSRA | Backlog and Customer Relationships        
Business Acquisition [Line Items]        
Estimated acquired intangible assets $ 2,100      
Weighted-average amortization life of acquired intangible assets 17 years      
Percentage of aggregate value of acquired intangible assets to be amortized over 7 years 50.00%      
Estimated period of amortization of 50% of the aggregate value of the intangible assets acquired under accelerated method 6 years      
CSRA | Common Stock        
Business Acquisition [Line Items]        
Percentage of interest acquired 100.00%      
Cash acquisition price (in dollars per share) | $ / shares $ 41.25      
Aerospace | Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Number of businesses acquired | business   1   2
Mission Systems | Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Number of businesses acquired | business   1    
Information Technology | Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Number of businesses sold | business   0   2