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Business Acquisitions and Divestitures - Identified Assets Acquired and Liabilities Assumed (SCRI Oncology, LLC) (Details) - USD ($) $ in Millions | Oct. 31, 2022 | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill |  | $ 9,934 | $ 9,947
U.S. Pharmaceutical |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill |  | $ 4,043 | $ 4,050
SCRI Oncology, LLC | U.S. Pharmaceutical |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Cash | $ 166 |  |
Contribution of USOR | 40 |  |
Total purchase consideration | 206 |  |
Receivables | 224 |  |
Property, plant, and equipment | 22 |  |
Operating lease right-of-use assets | 31 |  |
Intangible assets | 177 |  |
Current liabilities | (42) |  |
Long-term operating lease liabilities | (29) |  |
Other non-current liabilities | (43) |  |
Total identifiable net assets | 340 |  |
Noncontrolling interest | (222) |  |
Additional paid-in capital | (25) |  |
Goodwill | 113 |  |
Net assets acquired | $ 206 |  |

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