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Income Taxes - Reconciliation of Potential Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Reconciliation of the beginning and ending amount of potential tax benefits |  |  |
Beginning of year | $ 104 | $ 548 | $ 79
Increases in prior year position | 4 | 41 | 0
Increases in current year position | 17 | 13 | 470
Decreases in prior year position | 0 | (474) | (1)
Settlements with taxing authorities | 0 | (24) | 0
Lapse of statute of limitations | 0 | 0 | 0
End of year | $ 125 | $ 104 | $ 548

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