Commitments and Contingencies - Contingencies (Details) $ in Millions		1 Months Ended						16 Months Ended
	Feb. 21, 2020 USD ($)	Dec. 31, 2019 plaintiff	Jun. 30, 2019 plaintiff	Mar. 31, 2019 lawsuit officer	Oct. 31, 2018 plaintiff	Oct. 31, 2017 USD ($)	Oct. 31, 2015 USD ($)	Jun. 30, 2021 USD ($)
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