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Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Interest income	$ 179	$ 173	$ 118
Equity in earnings, net	7	9	4
Net gains (losses) on investments in equity securities	6	58	(24)
Other, net	44	(38)	34
Total	$ 236	202	132
Net gains (losses) on investments in equity securities		101	(24)
Corporate & Other
Segment Reporting Information [Line Items]
Other, net		(87)
Net gains (losses) on investments in equity securities		101	$ (24)
Operating Segments | North American Pharmaceutical
Segment Reporting Information [Line Items]
Equity in earnings, net		$ (43)

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