CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income		$ (146)	$ (5,358)	$ 1,262
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments, net of tax	[1]	300	(323)	(259)
Cash flow hedges adjustments, net of tax	[2]	19	(17)	(12)
Available-for-sale securities, net of tax	[3]	(9)	0	0
Pension and other post-retirement benefit plans, net of tax:
Prior service cost, net of tax	[4]	7	0	(21)
Amortization of prior service cost, net of tax	[5]	(13)	(8)	(13)
Pension and other post-retirement benefit plans, net of tax		(6)	(8)	(34)
Other comprehensive income (loss), net of taxes		304	(348)	(305)
Comprehensive income (loss)		158	(5,706)	957
Less: comprehensive income attributable to non-controlling interest		6	22	2
Comprehensive income (loss) attributable to DXC common stockholders		$ 152	$ (5,728)	$ 955

[1] Tax benefit related to foreign currency translation adjustments was $27, $2, and $1 for the fiscal years ended March 31, 2021, March 31, 2020, March 31, 2019, respectively.

[2] Tax expense (benefit) related to cash flow hedge adjustments was $6, $(5), and $(3) for the fiscal years ended March 31, 2021, March 31, 2020, March 31, 2019, respectively.

[3] Tax benefit related to available-for-sale securities was $1, $0, and $0 for the fiscal years ended March 31, 2021, March 31, 2020, March 31, 2019, respectively.

[4] Tax expense (benefit) related to prior service costs was $2, $0, and $(5) for the fiscal years ended March 31, 2021, March 31, 2020, March 31, 2019, respectively.

[5] Tax benefit related to amortization of prior service costs was $4, $1, and $2 for the fiscal years ended March 31, 2021, March 31, 2020, March 31, 2019, respectively.