Stock Incentive Plans - Schedule of Options (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Mar. 31, 2017
Additional Disclosures
Total intrinsic value of options exercised	$ 29	$ 44
Stock Options
Number of Option Shares
Outstanding beginning of period (in shares)	4,767,396
Granted (in shares)	1,067
HPE options converted to DXC options at Merger (in shares)	2,654,872
CSC Options Converted to RSU's due to Merger (in shares)	(1,521,519)
Exercised (in shares)	(711,432)
Canceled/Forfeited (in shares)	(925)
Expired (in shares)	(12,492)
Outstanding end of period (in shares)	5,176,967		4,767,396
Weighted Average Exercise Price
Weighted average exercise price - beginning of period (in dollars per share)	$ 38.70
Weighted average exercise price - granted (in dollars per share)	77.00
Weighted average exercise price - HPE options converted to DXC options at Merger (in dollars per share)	46.56
Weighted average exercise price - CSC Options converted to RSU's due to merger (in dollars per share)	51.00
Weighted average exercise price - exercised (in dollars per share)	35.93
Weighted average exercise price - cancelled/forfeited (in dollars per share)	54.20
Weighted average exercise price - expired (in dollars per share)	27.59
Weighted average exercise price - end of period (in dollars per share)	$ 39.53		$ 38.70
Additional Disclosures
Weighted average remaining contractual life (in years)	5 years 11 months 26 days		8 years 4 days
Aggregate intrinsic value	$ 193		$ 145
Total intrinsic value of options exercised	$ 29
Vested and Expected to Vest
Vested and expected to vest in the future as of period end (in shares)	5,166,000
Exercisable as of period end (in shares)	5,119,465
Weighted average exercise price vested and expected to vest as of period end (in dollars per share)	$ 39.47
Weighted average exercise price exercisable as of period end (in dollars per share)	$ 39.27
Weighted average remaining contractual life vested and expected to vest in the future as of period end (in years)	5 years 11 months 23 days
Weighted average remaining contractual life exercisable as of period end (in years)	5 years 11 months 19 days
Aggregate intrinsic value vested and expected to vest in the future as of period end	$ 193
Aggregate intrinsic value exercisable as of period end	$ 192