Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017		Jul. 01, 2016
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Balance	$ 2,166	[1]	$ 2,032
Balance	12,345		2,229
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Balance	(458)		(399)
Current-period other comprehensive income (loss)	154		(50)
Amounts reclassified from accumulated other comprehensive income (loss)	22		0
Balance	(282)		(449)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Balance	20		(1)
Current-period other comprehensive income (loss)	(3)		(5)
Amounts reclassified from accumulated other comprehensive income (loss)	0		0
Balance	17		(6)
Pension and Other Post-retirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Balance	276		289
Current-period other comprehensive income (loss)	0		0
Amounts reclassified from accumulated other comprehensive income (loss)	(4)		(3)
Balance	272		286
Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Balance	(162)		(111)
Current-period other comprehensive income (loss)	151		(55)
Amounts reclassified from accumulated other comprehensive income (loss)	18		(3)
Balance	$ 7		$ (169)

[1] Certain prior year amounts were adjusted to retroactively reflect the legal capital of DXC.