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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Extinguishment of Vencore HC and KGS HC debt and related costs     $ 994 $ 0
Decrease in goodwill due to fair value adjustments   $ 1    
Goodwill acquired during period     1,239  
Defense and Intelligence        
Business Acquisition [Line Items]        
Goodwill acquired during period     1,156  
Civilian and Health Care        
Business Acquisition [Line Items]        
Goodwill acquired during period     $ 83  
Vencore and KeyPoint        
Business Acquisition [Line Items]        
Shares issued in a business acquisition as a percentage of outstanding shares 14.00%      
Payments for acquisitions, net of cash acquired $ 400      
Extinguishment of Vencore HC and KGS HC debt and related costs $ 1,000      
Vencore        
Business Acquisition [Line Items]        
Number of shares issued in a business acquisition (in shares) 18,877,244      
Payments for acquisitions, net of cash acquired $ 400      
Extinguishment of Vencore HC and KGS HC debt and related costs 994      
Tax deductible goodwill $ 172      
KeyPoint        
Business Acquisition [Line Items]        
Number of shares issued in a business acquisition (in shares) 4,396,097