CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 4,288	$ 5,021	$ 13,344	$ 14,762
Costs of services (excludes depreciation and amortization and restructuring costs)	3,333	3,827	10,525	11,128
Selling, general, and administrative (excludes depreciation and amortization and restructuring costs)	517	518	1,595	1,514
Depreciation and amortization	475	479	1,492	1,416
Goodwill impairment losses	0	53	0	2,940
Restructuring costs	104	74	441	248
Interest expense	82	93	284	288
Interest income	(28)	(33)	(76)	(130)
Gain on disposition of businesses	(2,046)	0	(2,046)	0
Gain on arbitration award	0	0	0	(632)
Other income, net	(127)	(117)	(318)	(344)
Total costs and expenses	2,310	4,894	11,897	16,428
Income (loss) before income taxes	1,978	127	1,447	(1,666)
Income tax expense	875	37	789	191
Net income (loss)	1,103	90	658	(1,857)
Less: net income attributable to non-controlling interest, net of tax	5	8	9	17
Net income (loss) attributable to DXC common stockholders	$ 1,098	$ 82	$ 649	$ (1,874)
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 4.32	$ 0.32	$ 2.55	$ (7.20)
Diluted (in dollars per share)	$ 4.29	$ 0.32	$ 2.54	$ (7.20)