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Business Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2022 | Oct. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2023 | Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Fair value adjustment gain |  |  | $ 48 | $ 76 |
Goodwill |  |  | 9,934 | 9,934 | $ 9,947
U.S. Pharmaceutical |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill |  |  | 4,043 | 4,043 | 4,050
Rx Savings Solutions, LLC | RxTs Segment |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business acquisition, percentage of controlling interest in combined business | 100.00% |  |  |  |
Cash payments to acquire business | $ 600 |  |  |  |
Contingent consideration | 92 |  |  |  |
Other current liabilities |  |  | 15 | 15 | 83
Other non-current liabilities |  |  | $ 1 | $ 1 | $ 9
Acquired identifiable intangible assets | $ 229 |  |  |  |
Weighted average life of intangibles | 12 years |  |  |  |
Goodwill | $ 463 |  |  |  |
Rx Savings Solutions, LLC | RxTs Segment | Maximum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Contingent consideration | $ 275 |  |  |  |
SCRI Oncology, LLC | U.S. Pharmaceutical |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business acquisition, percentage of controlling interest in combined business |  | 51.00% |  |  |
Cash payments to acquire business |  | $ 166 |  |  |
Acquired identifiable intangible assets |  | $ 177 |  |  |
Weighted average life of intangibles |  | 17 years |  |  |
Goodwill |  | $ 113 |  |  |
Goodwill, expected tax deductible amount |  | 46 |  |  |
Noncontrolling interest |  | 222 |  |  |
SCRI Oncology, LLC | U.S. Pharmaceutical | SCRI |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Noncontrolling interest |  | 202 |  |  |
SCRI Oncology, LLC | U.S. Pharmaceutical | USOR |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Noncontrolling interest |  | $ 20 |  |  |

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