Income Taxes - Tax Expense (Benefit), Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Apr. 01, 2017
Income Tax Contingency [Line Items]
Transition tax expense (benefit)	$ (21)	$ (61)	$ (7)
Interest and penalties for uncertain tax positions included in current expenses (benefits)	$ 10	1	$ (3)
Hewlett Packard Enterprise Services
Income Tax Contingency [Line Items]
Tax indemnification receivable related to net uncertain tax positions				$ 17
Tax indemnification payable related to other tax receivables				52
Tax indemnification receivable related to other tax payables				$ 91
Discontinued Operations | USPS Separation
Income Tax Contingency [Line Items]
Tax indemnification receivable related to disposal		15
Tax indemnification payable related to disposal		$ 4