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Commitments and Contingencies - Contingencies (Details)
$ in Millions
1 Months Ended 16 Months Ended
Feb. 21, 2020
USD ($)
Dec. 31, 2019
plaintiff
Jun. 30, 2019
plaintiff
Mar. 31, 2019
officer
lawsuit
Oct. 31, 2018
plaintiff
Oct. 31, 2017
USD ($)
Oct. 31, 2015
USD ($)
Jun. 30, 2021
USD ($)
Feb. 02, 2017
jointVenture
Loss Contingencies [Line Items]                  
Number of partially-owned joint ventures involved in possible sanctions law violations | jointVenture                 2
Kemper Corporate Services, Inc. v. Computer Sciences Corporation                  
Loss Contingencies [Line Items]                  
Payments for litigation settlement $ 60.0                
Proceeds from litigation settlement               $ 12.5  
Kemper Corporate Services, Inc. v. Computer Sciences Corporation | Pending litigation                  
Loss Contingencies [Line Items]                  
Loss contingency, damages sought             $ 100.0    
Kemper Corporate Services, Inc. v. Computer Sciences Corporation | Settled litigation                  
Loss Contingencies [Line Items]                  
Amount awarded to other party           $ 84.2      
Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise | Pending litigation                  
Loss Contingencies [Line Items]                  
Number of plaintiffs | plaintiff     145   16        
Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise | Settled litigation                  
Loss Contingencies [Line Items]                  
Number of plaintiffs | plaintiff   142              
Forsyth et al. v. HP Inc. and Hewlett Packard Enterprise | Employees of Former Business Units of HPE | Settled litigation                  
Loss Contingencies [Line Items]                  
Number of plaintiffs | plaintiff   35     7        
In re DXC Technology Company Securities Litigation                  
Loss Contingencies [Line Items]                  
Lawsuits filed | lawsuit       3          
In re DXC Technology Company Securities Litigation | Officer                  
Loss Contingencies [Line Items]                  
Number of defendants | officer       1