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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
May 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Extinguishment of Vencore HC and KGS HC debt and related costs   $ 994 $ 0
Increase in goodwill due to fair value adjustments   1  
Goodwill acquired during period   1,240  
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 18,877,244    
Payments for acquisitions, net of cash acquired $ 400    
Extinguishment of Vencore HC and KGS HC debt and related costs $ 994    
KeyPoint      
Business Acquisition [Line Items]      
Number of shares issued in a business acquisition 4,396,097    
Defense and Intelligence      
Business Acquisition [Line Items]      
Goodwill acquired during period   1,157  
Civilian and Health Care      
Business Acquisition [Line Items]      
Goodwill acquired during period   $ 83