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Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Mar. 31, 2019
Shares  
Outstanding at beginning of year (in shares) 148
DXC awards replaced by Perspecta awards due to Spin-Off (in shares) (148)
Options converted to RSUs due to Spin-Off and Mergers (in shares) 181
Exercised (in shares) (18)
Forfeited (in shares) (1)
Outstanding, vested and exercisable at end of year (in shares) 162
Weighted Average Exercise Price Per Share  
Outstanding at beginning of year (in dollars per share) $ 45
DXC awards replaced by Perspecta awards due to Spin-Off (in dollars per share) 45
Options converted to RSUs due to Spin-Off and Mergers (in dollars per share) 12
Exercised (in dollars per share) 12
Forfeited (in dollars per share) 11
Outstanding, vested and exercisable at end of year (in dollars per share) $ 12
Weighted Average Remaining Contractual Term in Years 3 years
Aggregate Intrinsic Value $ 1