Commitments and Contingencies - Contingencies (Details) administrator in Thousands, $ in Millions						1 Months Ended	12 Months Ended
	Oct. 05, 2018 plaintiff	Oct. 02, 2017 USD ($)	Aug. 02, 2017 individual	Dec. 17, 2015 USD ($)	May 12, 2015 employee	Oct. 31, 2015 USD ($)	Mar. 31, 2017 employee	Apr. 03, 2015 administrator	Dec. 27, 2018 officer	Dec. 21, 2018 USD ($)	Jan. 30, 2018	Feb. 02, 2017 joint_venture	May 12, 2016
Loss Contingencies [Line Items]
Number of partially-owned joint ventures involved in possible sanctions law violations | joint_venture												2
Strauch and Colby v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Number of system administrators for class action, more than | administrator								4
Number of system administrators filed Consent to Join forms | administrator								1
Number of individuals involved in collective action | individual			700
Civil Complaint Against Eric Pulier
Loss Contingencies [Line Items]
Injunction Filed, Amount										$ 4.9
Forsyth v. HP Inc. And Hewlett Packard Enterprise
Loss Contingencies [Line Items]
Number of system administrators for class action, more than | plaintiff	16
Number of plaintiffs aligned with the company | plaintiff	7
City Of Warren Police And Fire Retirement System V. DXC Technology Company
Loss Contingencies [Line Items]
Number of officers named in case | officer									2
Settled litigation | Civil Complaint Against Eric Pulier
Loss Contingencies [Line Items]
Former employees under investigation | employee					2
Litigation settlement				$ 16.5
Former employees who pled guilty | employee							1
Loss contingency, legal fees percentage											80.00%		80.00%
Settled litigation | Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Litigation settlement to other party		$ 84.2
Pending litigation | Kemper Corporate Services, Inc. v. Computer Sciences Corporation
Loss Contingencies [Line Items]
Loss contingency, damages sought						$ 100.0