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Business Acquisitions and Divestitures - Identified Assets Acquired and Liabilities Assumed (Rx Savings Solutions) (Details) - USD ($) $ in Millions | Nov. 01, 2022 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | --- | --- | ---
Identifiable assets acquired and liabilities assumed: |  |  |  |
Goodwill |  | $ 10,022 | $ 10,132 | $ 9,947
Rx Savings Solutions, LLC | RxTs Segment |  |  |  |
Purchase consideration: |  |  |  |
Cash | $ 600 |  |  |
Contingent consideration | 92 |  |  |
Total purchase consideration | 692 |  |  |
Identifiable assets acquired and liabilities assumed: |  |  |  |
Current assets | 5 |  |  |
Intangible assets | 229 |  |  |
Other non-current assets | 3 |  |  |
Current liabilities | (8) |  |  |
Total identifiable net assets | 229 |  |  |
Goodwill | 463 |  |  |
Net assets acquired | $ 692 |  |  |

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