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Summary of Significant Accounting Policies - Narrative (Details) € in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2021 EUR (€) | Mar. 31, 2021 USD ($) | Oct. 01, 2020 USD ($)
HHS Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Transaction consideration |  |  | $ 5,000
HPS Business | Forecast |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Amount of cash consideration received | € 459 | $ 525 |

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