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Significant Accounting Policies - Schedule of Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Accounting Policies [Abstract]
Customer accounts	$ 24,247	$ 22,281
Other	3,997	3,862
Total receivables	28,244	26,143
Allowances	(259)	(500)
Receivables, net	$ 27,985	$ 25,643

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Accounts Receivable, Customer Accounts, Gross

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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