CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 1,103	$ 90	$ 658	$ (1,857)
Other comprehensive income, net of taxes:
Foreign currency translation adjustments, net of tax	[1]	170	293	200	87
Cash flow hedges adjustments, net of tax	[2]	0	(8)	18	(6)
Available-for-sale securities, net of tax	[3]	(11)	0	(6)	2
Prior service cost, net of tax	[4]	(1)	0	(1)	0
Pension and other post-retirement benefit plans, net of tax:
Amortization of prior service cost, net of tax	[5]	(2)	(2)	(12)	(6)
Pension and other post-retirement benefit plans, net of tax		(3)	(2)	(13)	(6)
Other comprehensive income, net of taxes		156	283	199	77
Comprehensive income (loss)		1,259	373	857	(1,780)
Less: comprehensive income attributable to non-controlling interest		6	39	12	26
Comprehensive income (loss) attributable to DXC common stockholders		$ 1,253	$ 334	$ 845	$ (1,806)

[1] Tax benefit related to foreign currency translation adjustments was $9 and $31 for the three and nine months ended December 31, 2020, respectively, and $15 and $2 for the three and nine months ended December 31, 2019, respectively.

[2] Tax expense related to cash flow hedge adjustments was $0 and $6 for the three and nine months ended December 31, 2020, respectively. Tax benefit related to cash flow hedge adjustments was $1 and $1 for the three and nine months ended December 31, 2019, respectively.

[3] Tax benefit related to available-for-sale securities was $4 for the three and nine months ended December 31, 2020. Tax expense related to available-for-sale securities was $0 and $1 for the three and nine months ended December 31, 2019, respectively.

[4] There was no tax benefit related to prior service costs during the three and nine months ended December 31, 2020 and December 31, 2019, respectively.

[5] Tax benefit related to amortization of prior service costs was $1 and $3 for the three and nine months ended December 31, 2020, respectively, and $0 and $1 for the three and nine months ended December 31, 2019, respectively.