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Stock Incentive Plans - Narrative (Details)
$ in Millions
3 Months Ended
Apr. 01, 2017
shares
Jun. 30, 2017
USD ($)
Anniversary
shares
Jul. 01, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incremental stock compensation expense   $ 40 $ 14
Plan term   10 years  
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures   $ 1  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   3 years  
Term of options   10 years  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares received per RSU | shares   1  
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures   $ 139  
Weighted average period over which cost is expected to be recognized (in years)   2 years 3 months 10 days  
RSUs | Five Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual installments   5 years  
RSUs | Ten Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual installments   10 years  
RSUs | Fifteen Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Annual installments   15 years  
RSUs | Service-based RSU's      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of anniversaries following the executive's termination that the shares are redeemable | Anniversary   10  
Performance-based Restricted Stock Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage   25.00%  
Vesting period (in years)   3 years  
Performance period   3 years  
HPES      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested awards became vested, triggered by Merger | shares 3,600,000    
Incremental stock compensation expense   $ 26  
HPES | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of options converted into RSU's upon merger 67.00%    
Upon Merger | HPES | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 33.00%    
DXC Share Purchase Plan | Stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares purchased under plan | shares   0