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Commitments and Contingent Liabilities - Antitrust Settlements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Operating Segments | U.S. Pharmaceutical |  |  |
Loss Contingencies [Line Items] |  |  |
Net cash proceeds from settlements | $ 444 | $ 244 | $ 129

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