Segment and Revenue Information - Net Revenue By Timing Recognition (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 7,531	$ 7,463	$ 7,562
Revenue recognized at a point in time
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	2,473	2,665	2,563
Revenue recognized over time
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 5,058	$ 4,798	$ 4,999

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details