Segment, Geographical Area, Major Customer and Major Supplier Information (Income From Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 1,645	$ 1,802	$ 1,873
Operating Segments \| North America Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	435	640	749
Operating Segments \| Europe Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	379	306	321
Operating Segments \| Asia Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	311	347	334
Operating Segments \| South America
Segment Reporting Information [Line Items]
Adjusted EBITDA	521	504	472
Intersegment eliminations
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (1)	$ 5	$ (3)

The net result for the period of deducting operating expenses from operating revenues.

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+ Details