Acquisitions - Summary of HPES Purchase Price (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Apr. 01, 2017
Business Acquisition [Line Items]
Goodwill	$ 7,619	$ 2,017	$ 7,606
Hewlett Packard Enterprise Services
Business Acquisition [Line Items]
Cash and cash equivalents				$ 938
Accounts receivable				4,102
Other current assets				530
Total current assets				5,570
Property and equipment				2,581
Intangible assets				6,016
Other assets				1,939
Total assets acquired				16,106
Accounts payable, accrued payroll, accrued expenses, and other current liabilities				(4,605)
Deferred revenue				(1,315)
Long-term debt, net of current maturities				(4,806)
Long-term deferred tax liabilities and income tax payable				(1,550)
Other liabilities				(1,322)
Total liabilities assumed				(13,598)
Net identifiable assets acquired				2,508
Add: Fair value of non-controlling interests				(50)
Goodwill				7,392
Total consideration transferred				$ 9,850
Adjustment to settle obligations	$ 203