CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 17,729	$ 19,577	$ 20,753
Costs of services (excludes depreciation and amortization and restructuring costs)	14,086	14,901	14,946
Selling, general and administrative (excludes depreciation and amortization and restructuring costs)	2,066	2,050	1,959
Depreciation and amortization	1,970	1,942	1,968
Goodwill impairment losses	0	6,794	0
Restructuring costs	551	252	465
Interest expense	361	383	334
Interest income	(98)	(165)	(128)
Debt extinguishment costs	41	0	0
Gain on disposition of businesses	(2,004)	0	0
Gain on arbitration award	0	(632)	0
Other expense (income), net	102	(720)	(306)
Total costs and expenses	17,075	24,805	19,238
Income (loss) from continuing operations, before taxes	654	(5,228)	1,515
Income tax expense	800	130	288
(Loss) income from continuing operations	(146)	(5,358)	1,227
Income from discontinued operations, net of taxes	0	0	35
Net (loss) income	(146)	(5,358)	1,262
Less: net income attributable to non-controlling interest, net of tax	3	11	5
Net (loss) income attributable to DXC common stockholders	$ (149)	$ (5,369)	$ 1,257
(Loss) income per common share - Basic:
Continuing operations (in dollars per share)	$ (0.59)	$ (20.76)	$ 4.40
Discontinued operations (in dollars per share)	0	0	0.13
Basic EPS (in dollars per share)	(0.59)	(20.76)	4.53
(Loss) income per common share - Diluted:
Continuing operations (in dollars per share)	(0.59)	(20.76)	4.35
Discontinued operations (in dollars per share)	0	0	0.12
Diluted EPS (in dollars per share)	$ (0.59)	$ (20.76)	$ 4.47