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Acquisitions - HPES Narrative (Details) - USD ($)
$ in Millions
Apr. 01, 2017
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 2,017 $ 7,606 $ 7,619
Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Shares issued for each share of CSC common stock (in shares) 1      
Equity interest issued (in shares) 141,298,797      
Percentage ownership of CSC stockholders following the Merger 49.90%      
Goodwill $ 7,392      
GBS        
Business Acquisition [Line Items]        
Goodwill   2,017 4,599 4,531
GBS | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Goodwill     2,800  
GIS        
Business Acquisition [Line Items]        
Goodwill   $ 0 3,007 $ 3,088
GIS | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Goodwill     2,600  
USPS | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Goodwill     $ 2,000  
Minimum | Customer relationships | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Useful lives (years) 10 years      
Minimum | Third-party purchased software | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Useful lives (years) 2 years      
Maximum | Customer relationships | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Useful lives (years) 13 years      
Maximum | Third-party purchased software | Hewlett Packard Enterprise Services        
Business Acquisition [Line Items]        
Useful lives (years) 7 years