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Divestitures - Narrative (Details) € in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2021 USD ($) | Oct. 01, 2020 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) | Apr. 01, 2021 EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 2,871 | $ 1,476 |  |
Gain (loss) on sale |  |  | $ 0 |  | $ 0 | $ 377 | $ 0 |  |
Senior Notes, Due 2023 | Senior Notes |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate | 0.0445% |  | 4.45% |  |  | 4.45% |  |  | 0.0445%
Repayments of debt | $ 154 |  |  | $ 319 |  |  |  |  |
Senior Notes, Due 2023 | Senior Notes |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate | 0.0445% |  | 4.45% |  |  | 4.45% |  |  | 0.0445%
Repayments of debt | $ 165 |  |  |  |  |  |  |  |
HPS Business | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Transaction consideration | 551 |  |  |  |  |  |  |  | € 468
Amount of consideration related to future services to be provided | 12 |  |  |  |  |  |  |  | € 10
Gain (loss) on sale | $ 341 |  |  |  |  |  |  |  |
Series of Insignificant Disposal Groups | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  |  | 49 |  |  |  | $ (10) |
Sales price adjustment related to prior year dispositions |  |  |  | $ 13 |  |  |  |  |
HHS Business | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Transaction consideration |  | $ 5,000 |  |  |  |  |  |  |
Repayments of debt |  | 3,500 |  |  |  |  |  |  |
Gain (loss) on sale |  | 2,014 |  |  |  |  |  |  |
Portion of consideration related to future services to be provided |  | 85 |  |  |  |  |  |  |
HHS Business | Discontinued Operations, Disposed of by Sale | Milano Purchasers |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repurchase receivables transferred |  | 272 |  |  |  |  |  |  |
Prepaid maintenance transferred |  | 12 |  |  |  |  |  |  |
Software licenses transferred |  | $ 48 |  |  |  |  |  |  |

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