Investment In and Advances to Non-Consolidated Affiliates and Related Party Transactions - Summary of Results of Operations (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Schedule of Equity Method Investments [Line Items]
Income tax provision	$ 64	$ 50
Net income	164	96
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Net sales	600	447
Costs and expenses related to net sales	593	445
Income tax provision	(1)	1
Net income	8	1
Purchases of tolling services from Alunorf	$ 78	$ 79

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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