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Income Taxes - Tax Expense (Benefit), Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Apr. 01, 2017
Income Tax Contingency [Line Items] |  |  |  |
Transition tax expense (benefit) | $ 0 | $ (21) | $ (61) |
Interest and penalties for uncertain tax positions included in current expenses (benefits) | $ 14 | 10 | $ 1 |
Hewlett Packard Enterprise Services |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax indemnification receivable related to net uncertain tax positions |  |  |  | $ 15
Tax indemnification payable related to other tax receivables |  |  |  | 38
Tax indemnification receivable related to other tax payables |  |  |  | $ 92
Discontinued Operations | USPS Separation |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax indemnification receivable related to disposal |  | 15 |  |
Tax indemnification payable related to disposal |  | $ 4 |  |

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