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Related Party Balances and Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Related Party Transaction [Line Items]
Revenues	$ 403,430	$ 359,051	$ 308,951
Receivables, net	27,985	25,643
Investee | North American Pharmaceutical
Related Party Transaction [Line Items]
Revenues	1,600	1,100
Receivables, net	$ 443	$ 313

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