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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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