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Financial Instruments - Schedule of Loans and Other Receivables Carried at Amortized Cost (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance for current expected credit losses | $ (3) | $ (20)
Loans and other receivables carried at amortized cost, net | 33 | 18
Loans receivable |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and other receivables carried at amortized cost | 27 | 27
Other receivables |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and other receivables carried at amortized cost | $ 9 | $ 11

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