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Business Acquisitions and Divestitures - Narrative (Details) £ in Millions, $ in Millions, € in Billions |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
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Nov. 01, 2022 USD ($) | Oct. 31, 2022 USD ($) | Apr. 06, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Apr. 06, 2022 GBP (£) | Mar. 31, 2022 USD ($) | Jul. 05, 2021 USD ($) | Jul. 05, 2021 EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  | $ 2,825 |  | $ 2,825 |  |  | $ 4,516 |  |
Liabilities held for sale |  |  |  | 1,991 |  | 1,991 |  |  | 4,741 |  |
Loss (gain) to remeasure disposal group to fair value |  |  |  |  |  | (35) | $ 470 |  |  |  |
McKesson and HCA Healthcare, Joint Oncology Research Business | U.S. Pharmaceutical | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire business |  | $ 173 |  |  |  |  |  |  |  |  |
Business acquisition, percentage of controlling interest in combined business |  | 51.00% |  |  |  |  |  |  |  |  |
Rx Savings Solutions, LLC | RxTs Segment | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash payment to acquire business | $ 600 |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 275 |  |  |  |  |  |  |  |  |  |
Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  | 2,800 |  | 2,800 |  |  | 4,500 |  |
Liabilities held for sale |  |  |  | 2,000 |  | 2,000 |  |  | 4,700 |  |
U.K. Disposal Group (Disposal Group) | Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divested net assets |  |  |  |  |  |  |  |  | 1,482 |  |
U.K. Disposal Group (Disposal Group) | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross purchase price |  |  | $ 144 |  |  |  |  | £ 110 |  |  |
Proceeds from collection of notes receivable |  |  | 118 |  |  |  |  |  |  |  |
E.U. Businesses (Disposal Group) | Held-for-sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross purchase price |  |  |  |  |  |  |  |  |  | $ 1,200 | € 1.2
Loss (gain) to remeasure disposal group to fair value |  |  |  | (23) | $ 491 | (35) | $ 491 |  |  |  |
Accumulated other comprehensive loss in charge for remeasurement to fair value |  |  |  | 226 |  | 226 |  |  |  |  |
Divested net assets |  |  |  | $ 2,825 |  | $ 2,825 |  |  | $ 3,024 |  |
E.U. Businesses (Disposal Group) | Disposed of by sale | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from divestiture |  | $ 892 |  |  |  |  |  |  |  |  |
International Segment | Disposed of by sale | Aurelius Elephant Limited |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divested net assets |  |  | 615 |  |  |  |  |  |  |  |
Accumulated other comprehensive loss adjustment |  |  | $ 731 |  |  |  |  |  |  |  |

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