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Acquisitions and Divestitures, Goodwill and Intangible Assets - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 03, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
business
Oct. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
business
Business Acquisition [Line Items]            
Amortization expense   $ 86 $ 19 $ 190 $ 57  
CSRA            
Business Acquisition [Line Items]            
Estimated acquired intangible assets $ 2,069          
Goodwill expected to be deductible for tax purposes 490          
Revenues of acquiree included in reported results since acquisition date   1,200   2,500    
Operating earnings of acquiree included in reported results since acquisition date   130   265    
Pre-tax earnings of acquiree included in reported results since acquisition date   $ 140   285    
Payments to acquire businesses, gross 9,749          
Acquisition-related costs       45    
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 | Operating costs and expenses and other income (expense)            
Business Acquisition [Line Items]            
Acquisition-related costs       $ 75    
CSRA | Common Stock            
Business Acquisition [Line Items]            
Percentage of interest acquired 100.00%          
Cash acquisition price (in dollars per share) | $ / shares $ 41.25          
Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Number of businesses acquired | business       2   4
Payments to acquire businesses, gross       $ 335   $ 399