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Related Party Balances and Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Related Party Transaction [Line Items]
Revenues	$ 359,051	$ 308,951	$ 276,711
Receivables, net	25,643	$ 21,622
Investee | U.S. Pharmaceutical and Specialty Solutions
Related Party Transaction [Line Items]
Revenues	1,100
Receivables, net	$ 313

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