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SUMMARY OF ACCOUNTING POLICIES - Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Accounting Policies [Abstract] |  |  |
Equity securities, FV-NI | $ 119 | $ 123 |
Equity in earnings (losses) of unconsolidated affiliates | $ (3) | $ 8 | $ (4)

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